* [PATCH v2] pci: pcie-xilinx: fix a missing-check bug for __get_free_pages
@ 2019-03-23 21:04 ` Aditya Pakki
0 siblings, 0 replies; 10+ messages in thread
From: Aditya Pakki @ 2019-03-23 21:04 UTC (permalink / raw)
To: pakki001
Cc: kjlu, Lorenzo Pieralisi, Bjorn Helgaas, Michal Simek, linux-pci,
linux-arm-kernel, linux-kernel
In case __get_free_pages fail, the fix returns error upstream
to avoid NULL pointer dereference.
Signed-off-by: Aditya Pakki <pakki001@umn.edu>
---
v1: Return error upstream as suggested by Steven
---
drivers/pci/controller/pcie-xilinx.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
index 9bd1a35cd5d8..91d8945bfb0c 100644
--- a/drivers/pci/controller/pcie-xilinx.c
+++ b/drivers/pci/controller/pcie-xilinx.c
@@ -335,15 +335,19 @@ static const struct irq_domain_ops msi_domain_ops = {
/**
* xilinx_pcie_enable_msi - Enable MSI support
* @port: PCIe port information
+ * Return: 0 on success, negative error on failure
*/
-static void xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
+static int xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
{
phys_addr_t msg_addr;
port->msi_pages = __get_free_pages(GFP_KERNEL, 0);
+ if (!port->msi_pages)
+ return -ENOMEM;
msg_addr = virt_to_phys((void *)port->msi_pages);
pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1);
pcie_write(port, msg_addr, XILINX_PCIE_REG_MSIBASE2);
+ return 0;
}
/* INTx Functions */
@@ -498,6 +502,7 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
struct device *dev = port->dev;
struct device_node *node = dev->of_node;
struct device_node *pcie_intc_node;
+ int ret;
/* Setup INTx */
pcie_intc_node = of_get_next_child(node, NULL);
@@ -526,7 +531,9 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
return -ENODEV;
}
- xilinx_pcie_enable_msi(port);
+ ret = xilinx_pcie_enable_msi(port);
+ if (ret)
+ return ret;
}
return 0;
--
2.17.1
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2] pci: pcie-xilinx: fix a missing-check bug for __get_free_pages
@ 2019-03-23 21:04 ` Aditya Pakki
0 siblings, 0 replies; 10+ messages in thread
From: Aditya Pakki @ 2019-03-23 21:04 UTC (permalink / raw)
To: pakki001
Cc: Lorenzo Pieralisi, linux-pci, kjlu, Michal Simek, linux-kernel,
Bjorn Helgaas, linux-arm-kernel
In case __get_free_pages fail, the fix returns error upstream
to avoid NULL pointer dereference.
Signed-off-by: Aditya Pakki <pakki001@umn.edu>
---
v1: Return error upstream as suggested by Steven
---
drivers/pci/controller/pcie-xilinx.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
index 9bd1a35cd5d8..91d8945bfb0c 100644
--- a/drivers/pci/controller/pcie-xilinx.c
+++ b/drivers/pci/controller/pcie-xilinx.c
@@ -335,15 +335,19 @@ static const struct irq_domain_ops msi_domain_ops = {
/**
* xilinx_pcie_enable_msi - Enable MSI support
* @port: PCIe port information
+ * Return: 0 on success, negative error on failure
*/
-static void xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
+static int xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
{
phys_addr_t msg_addr;
port->msi_pages = __get_free_pages(GFP_KERNEL, 0);
+ if (!port->msi_pages)
+ return -ENOMEM;
msg_addr = virt_to_phys((void *)port->msi_pages);
pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1);
pcie_write(port, msg_addr, XILINX_PCIE_REG_MSIBASE2);
+ return 0;
}
/* INTx Functions */
@@ -498,6 +502,7 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
struct device *dev = port->dev;
struct device_node *node = dev->of_node;
struct device_node *pcie_intc_node;
+ int ret;
/* Setup INTx */
pcie_intc_node = of_get_next_child(node, NULL);
@@ -526,7 +531,9 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
return -ENODEV;
}
- xilinx_pcie_enable_msi(port);
+ ret = xilinx_pcie_enable_msi(port);
+ if (ret)
+ return ret;
}
return 0;
--
2.17.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 10+ messages in thread* Re: [PATCH v2] pci: pcie-xilinx: fix a missing-check bug for __get_free_pages
2019-03-23 21:04 ` Aditya Pakki
@ 2019-03-25 12:08 ` Steven Price
-1 siblings, 0 replies; 10+ messages in thread
From: Steven Price @ 2019-03-25 12:08 UTC (permalink / raw)
To: Aditya Pakki
Cc: Lorenzo Pieralisi, linux-pci, kjlu, Michal Simek, linux-kernel,
Bjorn Helgaas, linux-arm-kernel
On 23/03/2019 21:04, Aditya Pakki wrote:
> In case __get_free_pages fail, the fix returns error upstream
> to avoid NULL pointer dereference.
>
> Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Reviewed-by: Steven Price <steven.price@arm.com>
>
> ---
> v1: Return error upstream as suggested by Steven
> ---
> drivers/pci/controller/pcie-xilinx.c | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
> index 9bd1a35cd5d8..91d8945bfb0c 100644
> --- a/drivers/pci/controller/pcie-xilinx.c
> +++ b/drivers/pci/controller/pcie-xilinx.c
> @@ -335,15 +335,19 @@ static const struct irq_domain_ops msi_domain_ops = {
> /**
> * xilinx_pcie_enable_msi - Enable MSI support
> * @port: PCIe port information
> + * Return: 0 on success, negative error on failure
> */
> -static void xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
> +static int xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
> {
> phys_addr_t msg_addr;
>
> port->msi_pages = __get_free_pages(GFP_KERNEL, 0);
> + if (!port->msi_pages)
> + return -ENOMEM;
> msg_addr = virt_to_phys((void *)port->msi_pages);
> pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1);
> pcie_write(port, msg_addr, XILINX_PCIE_REG_MSIBASE2);
> + return 0;
> }
>
> /* INTx Functions */
> @@ -498,6 +502,7 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
> struct device *dev = port->dev;
> struct device_node *node = dev->of_node;
> struct device_node *pcie_intc_node;
> + int ret;
>
> /* Setup INTx */
> pcie_intc_node = of_get_next_child(node, NULL);
> @@ -526,7 +531,9 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
> return -ENODEV;
> }
>
> - xilinx_pcie_enable_msi(port);
> + ret = xilinx_pcie_enable_msi(port);
> + if (ret)
> + return ret;
> }
>
> return 0;
>
^ permalink raw reply [flat|nested] 10+ messages in thread* Re: [PATCH v2] pci: pcie-xilinx: fix a missing-check bug for __get_free_pages
@ 2019-03-25 12:08 ` Steven Price
0 siblings, 0 replies; 10+ messages in thread
From: Steven Price @ 2019-03-25 12:08 UTC (permalink / raw)
To: Aditya Pakki
Cc: Lorenzo Pieralisi, linux-pci, kjlu, Michal Simek, linux-kernel,
Bjorn Helgaas, linux-arm-kernel
On 23/03/2019 21:04, Aditya Pakki wrote:
> In case __get_free_pages fail, the fix returns error upstream
> to avoid NULL pointer dereference.
>
> Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Reviewed-by: Steven Price <steven.price@arm.com>
>
> ---
> v1: Return error upstream as suggested by Steven
> ---
> drivers/pci/controller/pcie-xilinx.c | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
> index 9bd1a35cd5d8..91d8945bfb0c 100644
> --- a/drivers/pci/controller/pcie-xilinx.c
> +++ b/drivers/pci/controller/pcie-xilinx.c
> @@ -335,15 +335,19 @@ static const struct irq_domain_ops msi_domain_ops = {
> /**
> * xilinx_pcie_enable_msi - Enable MSI support
> * @port: PCIe port information
> + * Return: 0 on success, negative error on failure
> */
> -static void xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
> +static int xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
> {
> phys_addr_t msg_addr;
>
> port->msi_pages = __get_free_pages(GFP_KERNEL, 0);
> + if (!port->msi_pages)
> + return -ENOMEM;
> msg_addr = virt_to_phys((void *)port->msi_pages);
> pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1);
> pcie_write(port, msg_addr, XILINX_PCIE_REG_MSIBASE2);
> + return 0;
> }
>
> /* INTx Functions */
> @@ -498,6 +502,7 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
> struct device *dev = port->dev;
> struct device_node *node = dev->of_node;
> struct device_node *pcie_intc_node;
> + int ret;
>
> /* Setup INTx */
> pcie_intc_node = of_get_next_child(node, NULL);
> @@ -526,7 +531,9 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
> return -ENODEV;
> }
>
> - xilinx_pcie_enable_msi(port);
> + ret = xilinx_pcie_enable_msi(port);
> + if (ret)
> + return ret;
> }
>
> return 0;
>
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH v2] pci: pcie-xilinx: fix a missing-check bug for __get_free_pages
2019-03-23 21:04 ` Aditya Pakki
@ 2019-03-26 13:01 ` Robin Murphy
-1 siblings, 0 replies; 10+ messages in thread
From: Robin Murphy @ 2019-03-26 13:01 UTC (permalink / raw)
To: Aditya Pakki
Cc: Lorenzo Pieralisi, linux-pci, kjlu, Michal Simek, linux-kernel,
Bjorn Helgaas, linux-arm-kernel
On 23/03/2019 21:04, Aditya Pakki wrote:
> In case __get_free_pages fail, the fix returns error upstream
> to avoid NULL pointer dereference.
Where does msi_pages ever get dereferenced?
The logic here might actually still have a chance of working out OK with
NULL depending on how the memory maps line up, but even if it doesn't,
the problem is certainly not one of dereferencing.
Robin.
> Signed-off-by: Aditya Pakki <pakki001@umn.edu>
>
> ---
> v1: Return error upstream as suggested by Steven
> ---
> drivers/pci/controller/pcie-xilinx.c | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
> index 9bd1a35cd5d8..91d8945bfb0c 100644
> --- a/drivers/pci/controller/pcie-xilinx.c
> +++ b/drivers/pci/controller/pcie-xilinx.c
> @@ -335,15 +335,19 @@ static const struct irq_domain_ops msi_domain_ops = {
> /**
> * xilinx_pcie_enable_msi - Enable MSI support
> * @port: PCIe port information
> + * Return: 0 on success, negative error on failure
> */
> -static void xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
> +static int xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
> {
> phys_addr_t msg_addr;
>
> port->msi_pages = __get_free_pages(GFP_KERNEL, 0);
> + if (!port->msi_pages)
> + return -ENOMEM;
> msg_addr = virt_to_phys((void *)port->msi_pages);
> pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1);
> pcie_write(port, msg_addr, XILINX_PCIE_REG_MSIBASE2);
> + return 0;
> }
>
> /* INTx Functions */
> @@ -498,6 +502,7 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
> struct device *dev = port->dev;
> struct device_node *node = dev->of_node;
> struct device_node *pcie_intc_node;
> + int ret;
>
> /* Setup INTx */
> pcie_intc_node = of_get_next_child(node, NULL);
> @@ -526,7 +531,9 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
> return -ENODEV;
> }
>
> - xilinx_pcie_enable_msi(port);
> + ret = xilinx_pcie_enable_msi(port);
> + if (ret)
> + return ret;
> }
>
> return 0;
>
^ permalink raw reply [flat|nested] 10+ messages in thread* Re: [PATCH v2] pci: pcie-xilinx: fix a missing-check bug for __get_free_pages
@ 2019-03-26 13:01 ` Robin Murphy
0 siblings, 0 replies; 10+ messages in thread
From: Robin Murphy @ 2019-03-26 13:01 UTC (permalink / raw)
To: Aditya Pakki
Cc: Lorenzo Pieralisi, linux-pci, kjlu, Michal Simek, linux-kernel,
Bjorn Helgaas, linux-arm-kernel
On 23/03/2019 21:04, Aditya Pakki wrote:
> In case __get_free_pages fail, the fix returns error upstream
> to avoid NULL pointer dereference.
Where does msi_pages ever get dereferenced?
The logic here might actually still have a chance of working out OK with
NULL depending on how the memory maps line up, but even if it doesn't,
the problem is certainly not one of dereferencing.
Robin.
> Signed-off-by: Aditya Pakki <pakki001@umn.edu>
>
> ---
> v1: Return error upstream as suggested by Steven
> ---
> drivers/pci/controller/pcie-xilinx.c | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
> index 9bd1a35cd5d8..91d8945bfb0c 100644
> --- a/drivers/pci/controller/pcie-xilinx.c
> +++ b/drivers/pci/controller/pcie-xilinx.c
> @@ -335,15 +335,19 @@ static const struct irq_domain_ops msi_domain_ops = {
> /**
> * xilinx_pcie_enable_msi - Enable MSI support
> * @port: PCIe port information
> + * Return: 0 on success, negative error on failure
> */
> -static void xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
> +static int xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
> {
> phys_addr_t msg_addr;
>
> port->msi_pages = __get_free_pages(GFP_KERNEL, 0);
> + if (!port->msi_pages)
> + return -ENOMEM;
> msg_addr = virt_to_phys((void *)port->msi_pages);
> pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1);
> pcie_write(port, msg_addr, XILINX_PCIE_REG_MSIBASE2);
> + return 0;
> }
>
> /* INTx Functions */
> @@ -498,6 +502,7 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
> struct device *dev = port->dev;
> struct device_node *node = dev->of_node;
> struct device_node *pcie_intc_node;
> + int ret;
>
> /* Setup INTx */
> pcie_intc_node = of_get_next_child(node, NULL);
> @@ -526,7 +531,9 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
> return -ENODEV;
> }
>
> - xilinx_pcie_enable_msi(port);
> + ret = xilinx_pcie_enable_msi(port);
> + if (ret)
> + return ret;
> }
>
> return 0;
>
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH] pci: pcie-xilinx: fix a missing-check bug for __get_free_pages
@ 2019-03-22 16:26 Steven Price
2019-03-25 21:31 ` Kangjie Lu
0 siblings, 1 reply; 10+ messages in thread
From: Steven Price @ 2019-03-22 16:26 UTC (permalink / raw)
To: Kangjie Lu
Cc: Lorenzo Pieralisi, linux-pci, Michal Simek, linux-kernel,
pakki001, Bjorn Helgaas, linux-arm-kernel
On 14/03/2019 05:58, Kangjie Lu wrote:
> In case __get_free_pages fail, the fix returns to avoid NULL
> pointer dereference.
>
> Signed-off-by: Kangjie Lu <kjlu@umn.edu>
> ---
> drivers/pci/controller/pcie-xilinx.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
> index 9bd1a35cd5d8..b7083e995c45 100644
> --- a/drivers/pci/controller/pcie-xilinx.c
> +++ b/drivers/pci/controller/pcie-xilinx.c
> @@ -341,6 +341,9 @@ static void xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
> phys_addr_t msg_addr;
>
> port->msi_pages = __get_free_pages(GFP_KERNEL, 0);
> + if (unlikely(!port->msi_pages))
> + return;
Shouldn't the function return an error code for the calling function to
see? With this change the caller (xilinx_pcie_init_irq_domain) will
think that MSIs were enabled, but actually they weren't.
Steve
> +
> msg_addr = virt_to_phys((void *)port->msi_pages);
> pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1);
> pcie_write(port, msg_addr, XILINX_PCIE_REG_MSIBASE2);
>
^ permalink raw reply [flat|nested] 10+ messages in thread
* [PATCH v2] pci: pcie-xilinx: fix a missing-check bug for __get_free_pages
2019-03-22 16:26 [PATCH] " Steven Price
@ 2019-03-25 21:31 ` Kangjie Lu
0 siblings, 0 replies; 10+ messages in thread
From: Kangjie Lu @ 2019-03-25 21:31 UTC (permalink / raw)
To: kjlu
Cc: pakki001, Lorenzo Pieralisi, Bjorn Helgaas, Michal Simek,
linux-pci, linux-arm-kernel, linux-kernel
In case __get_free_pages fail, the fix returns -ENOMEMto avoid
NULL pointer dereference.
Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Reviewed-by: Steven Price <steven.price@arm.com>
---
v2: caller is redefined to accept the error code, as suggested by
Steven Price <steven.price@arm.com>
---
drivers/pci/controller/pcie-xilinx.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
index 9bd1a35cd5d8..abc214e94f7c 100644
--- a/drivers/pci/controller/pcie-xilinx.c
+++ b/drivers/pci/controller/pcie-xilinx.c
@@ -336,14 +336,19 @@ static const struct irq_domain_ops msi_domain_ops = {
* xilinx_pcie_enable_msi - Enable MSI support
* @port: PCIe port information
*/
-static void xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
+static int xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
{
phys_addr_t msg_addr;
port->msi_pages = __get_free_pages(GFP_KERNEL, 0);
+ if (unlikely(!port->msi_pages))
+ return -ENOMEM;
+
msg_addr = virt_to_phys((void *)port->msi_pages);
pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1);
pcie_write(port, msg_addr, XILINX_PCIE_REG_MSIBASE2);
+
+ return 0;
}
/* INTx Functions */
@@ -498,6 +503,7 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
struct device *dev = port->dev;
struct device_node *node = dev->of_node;
struct device_node *pcie_intc_node;
+ int ret;
/* Setup INTx */
pcie_intc_node = of_get_next_child(node, NULL);
@@ -526,7 +532,9 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
return -ENODEV;
}
- xilinx_pcie_enable_msi(port);
+ ret = xilinx_pcie_enable_msi(port);
+ if (ret)
+ return ret;
}
return 0;
--
2.17.1
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2] pci: pcie-xilinx: fix a missing-check bug for __get_free_pages
@ 2019-03-25 21:31 ` Kangjie Lu
0 siblings, 0 replies; 10+ messages in thread
From: Kangjie Lu @ 2019-03-25 21:31 UTC (permalink / raw)
To: kjlu
Cc: Lorenzo Pieralisi, linux-pci, Michal Simek, linux-kernel,
pakki001, Bjorn Helgaas, linux-arm-kernel
In case __get_free_pages fail, the fix returns -ENOMEMto avoid
NULL pointer dereference.
Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Reviewed-by: Steven Price <steven.price@arm.com>
---
v2: caller is redefined to accept the error code, as suggested by
Steven Price <steven.price@arm.com>
---
drivers/pci/controller/pcie-xilinx.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
index 9bd1a35cd5d8..abc214e94f7c 100644
--- a/drivers/pci/controller/pcie-xilinx.c
+++ b/drivers/pci/controller/pcie-xilinx.c
@@ -336,14 +336,19 @@ static const struct irq_domain_ops msi_domain_ops = {
* xilinx_pcie_enable_msi - Enable MSI support
* @port: PCIe port information
*/
-static void xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
+static int xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
{
phys_addr_t msg_addr;
port->msi_pages = __get_free_pages(GFP_KERNEL, 0);
+ if (unlikely(!port->msi_pages))
+ return -ENOMEM;
+
msg_addr = virt_to_phys((void *)port->msi_pages);
pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1);
pcie_write(port, msg_addr, XILINX_PCIE_REG_MSIBASE2);
+
+ return 0;
}
/* INTx Functions */
@@ -498,6 +503,7 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
struct device *dev = port->dev;
struct device_node *node = dev->of_node;
struct device_node *pcie_intc_node;
+ int ret;
/* Setup INTx */
pcie_intc_node = of_get_next_child(node, NULL);
@@ -526,7 +532,9 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
return -ENODEV;
}
- xilinx_pcie_enable_msi(port);
+ ret = xilinx_pcie_enable_msi(port);
+ if (ret)
+ return ret;
}
return 0;
--
2.17.1
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^ permalink raw reply related [flat|nested] 10+ messages in thread* Re: [PATCH v2] pci: pcie-xilinx: fix a missing-check bug for __get_free_pages
2019-03-25 21:31 ` Kangjie Lu
@ 2019-03-25 21:51 ` Bjorn Helgaas
-1 siblings, 0 replies; 10+ messages in thread
From: Bjorn Helgaas @ 2019-03-25 21:51 UTC (permalink / raw)
To: Kangjie Lu
Cc: Lorenzo Pieralisi, linux-pci, Michal Simek, linux-kernel,
pakki001, linux-arm-kernel
Hi Kangjie,
Thanks for the patch!
Please update the subject line like this:
PCI: xilinx: Check for __get_free_pages() failure
You can always get a good idea of the style for subject lines by doing
something like this:
git log --oneline --follow drivers/pci/controller/pcie-xilinx.c
On Mon, Mar 25, 2019 at 04:31:13PM -0500, Kangjie Lu wrote:
> In case __get_free_pages fail, the fix returns -ENOMEMto avoid
> NULL pointer dereference.
s/In case/If/
s/__get_free_pages/__get_free_pages()/
s/fail/fails/
s/the fix returns/return/
s/-ENOMEMto/-ENOMEM to/
> Signed-off-by: Kangjie Lu <kjlu@umn.edu>
> Reviewed-by: Steven Price <steven.price@arm.com>
I didn't see Steven's reviewed-by on the mailing list. I did see his
*review*, but his "Reviewed-by: Steven Price <steven.price@arm.com>"
implies that he reviewed it *and* believes it to ready for merging
(see Documentation/process/submitting-patches.rst for all the
details).
So we should only add the Reviewed-by tag after Steven himself posts
it.
> ---
> v2: caller is redefined to accept the error code, as suggested by
> Steven Price <steven.price@arm.com>
> ---
> drivers/pci/controller/pcie-xilinx.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
> index 9bd1a35cd5d8..abc214e94f7c 100644
> --- a/drivers/pci/controller/pcie-xilinx.c
> +++ b/drivers/pci/controller/pcie-xilinx.c
> @@ -336,14 +336,19 @@ static const struct irq_domain_ops msi_domain_ops = {
> * xilinx_pcie_enable_msi - Enable MSI support
> * @port: PCIe port information
> */
> -static void xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
> +static int xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
> {
> phys_addr_t msg_addr;
>
> port->msi_pages = __get_free_pages(GFP_KERNEL, 0);
> + if (unlikely(!port->msi_pages))
> + return -ENOMEM;
No need to use "unlikely()" here. It *is* unlikely that
__get_free_pages() will fail, but the annotation clutters the code a
bit, so I prefer to avoid it except for performance paths.
This should probably be documented somewhere in
Documentation/process/, but regrettably, it isn't (yet).
> msg_addr = virt_to_phys((void *)port->msi_pages);
> pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1);
> pcie_write(port, msg_addr, XILINX_PCIE_REG_MSIBASE2);
> +
> + return 0;
> }
>
> /* INTx Functions */
> @@ -498,6 +503,7 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
> struct device *dev = port->dev;
> struct device_node *node = dev->of_node;
> struct device_node *pcie_intc_node;
> + int ret;
>
> /* Setup INTx */
> pcie_intc_node = of_get_next_child(node, NULL);
> @@ -526,7 +532,9 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
> return -ENODEV;
> }
>
> - xilinx_pcie_enable_msi(port);
> + ret = xilinx_pcie_enable_msi(port);
> + if (ret)
> + return ret;
> }
>
> return 0;
> --
> 2.17.1
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 10+ messages in thread* Re: [PATCH v2] pci: pcie-xilinx: fix a missing-check bug for __get_free_pages
@ 2019-03-25 21:51 ` Bjorn Helgaas
0 siblings, 0 replies; 10+ messages in thread
From: Bjorn Helgaas @ 2019-03-25 21:51 UTC (permalink / raw)
To: Kangjie Lu
Cc: Lorenzo Pieralisi, linux-pci, Michal Simek, linux-kernel,
pakki001, linux-arm-kernel
Hi Kangjie,
Thanks for the patch!
Please update the subject line like this:
PCI: xilinx: Check for __get_free_pages() failure
You can always get a good idea of the style for subject lines by doing
something like this:
git log --oneline --follow drivers/pci/controller/pcie-xilinx.c
On Mon, Mar 25, 2019 at 04:31:13PM -0500, Kangjie Lu wrote:
> In case __get_free_pages fail, the fix returns -ENOMEMto avoid
> NULL pointer dereference.
s/In case/If/
s/__get_free_pages/__get_free_pages()/
s/fail/fails/
s/the fix returns/return/
s/-ENOMEMto/-ENOMEM to/
> Signed-off-by: Kangjie Lu <kjlu@umn.edu>
> Reviewed-by: Steven Price <steven.price@arm.com>
I didn't see Steven's reviewed-by on the mailing list. I did see his
*review*, but his "Reviewed-by: Steven Price <steven.price@arm.com>"
implies that he reviewed it *and* believes it to ready for merging
(see Documentation/process/submitting-patches.rst for all the
details).
So we should only add the Reviewed-by tag after Steven himself posts
it.
> ---
> v2: caller is redefined to accept the error code, as suggested by
> Steven Price <steven.price@arm.com>
> ---
> drivers/pci/controller/pcie-xilinx.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
> index 9bd1a35cd5d8..abc214e94f7c 100644
> --- a/drivers/pci/controller/pcie-xilinx.c
> +++ b/drivers/pci/controller/pcie-xilinx.c
> @@ -336,14 +336,19 @@ static const struct irq_domain_ops msi_domain_ops = {
> * xilinx_pcie_enable_msi - Enable MSI support
> * @port: PCIe port information
> */
> -static void xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
> +static int xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
> {
> phys_addr_t msg_addr;
>
> port->msi_pages = __get_free_pages(GFP_KERNEL, 0);
> + if (unlikely(!port->msi_pages))
> + return -ENOMEM;
No need to use "unlikely()" here. It *is* unlikely that
__get_free_pages() will fail, but the annotation clutters the code a
bit, so I prefer to avoid it except for performance paths.
This should probably be documented somewhere in
Documentation/process/, but regrettably, it isn't (yet).
> msg_addr = virt_to_phys((void *)port->msi_pages);
> pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1);
> pcie_write(port, msg_addr, XILINX_PCIE_REG_MSIBASE2);
> +
> + return 0;
> }
>
> /* INTx Functions */
> @@ -498,6 +503,7 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
> struct device *dev = port->dev;
> struct device_node *node = dev->of_node;
> struct device_node *pcie_intc_node;
> + int ret;
>
> /* Setup INTx */
> pcie_intc_node = of_get_next_child(node, NULL);
> @@ -526,7 +532,9 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
> return -ENODEV;
> }
>
> - xilinx_pcie_enable_msi(port);
> + ret = xilinx_pcie_enable_msi(port);
> + if (ret)
> + return ret;
> }
>
> return 0;
> --
> 2.17.1
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2019-03-26 13:01 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-03-23 21:04 [PATCH v2] pci: pcie-xilinx: fix a missing-check bug for __get_free_pages Aditya Pakki
2019-03-23 21:04 ` Aditya Pakki
2019-03-25 12:08 ` Steven Price
2019-03-25 12:08 ` Steven Price
2019-03-26 13:01 ` Robin Murphy
2019-03-26 13:01 ` Robin Murphy
-- strict thread matches above, loose matches on Subject: below --
2019-03-22 16:26 [PATCH] " Steven Price
2019-03-25 21:31 ` [PATCH v2] " Kangjie Lu
2019-03-25 21:31 ` Kangjie Lu
2019-03-25 21:51 ` Bjorn Helgaas
2019-03-25 21:51 ` Bjorn Helgaas
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