* [PATCH] PCI: cpqphp: Fix possible NULL pointer dereference
@ 2018-02-25 2:01 Shawn Lin
2018-02-28 20:37 ` Bjorn Helgaas
0 siblings, 1 reply; 2+ messages in thread
From: Shawn Lin @ 2018-02-25 2:01 UTC (permalink / raw)
To: Bjorn Helgaas; +Cc: linux-pci, Shawn Lin
io_node is used before verify whether it's null pointer,
so move the check of null pointer immediately after.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
---
drivers/pci/hotplug/cpqphp_ctrl.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)
diff --git a/drivers/pci/hotplug/cpqphp_ctrl.c b/drivers/pci/hotplug/cpqphp_ctrl.c
index b1b6e45..616df44 100644
--- a/drivers/pci/hotplug/cpqphp_ctrl.c
+++ b/drivers/pci/hotplug/cpqphp_ctrl.c
@@ -2812,18 +2812,16 @@ static int configure_new_function(struct controller *ctrl, struct pci_func *func
dbg("CND: length = 0x%x\n", base);
io_node = get_io_resource(&(resources->io_head), base);
+ if (!io_node)
+ return -ENOMEM;
dbg("Got io_node start = %8.8x, length = %8.8x next (%p)\n",
io_node->base, io_node->length, io_node->next);
dbg("func (%p) io_head (%p)\n", func, func->io_head);
/* allocate the resource to the board */
- if (io_node) {
- base = io_node->base;
-
- io_node->next = func->io_head;
- func->io_head = io_node;
- } else
- return -ENOMEM;
+ base = io_node->base;
+ io_node->next = func->io_head;
+ func->io_head = io_node;
} else if ((temp_register & 0x0BL) == 0x08) {
/* Map prefetchable memory */
base = temp_register & 0xFFFFFFF0;
--
1.9.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] PCI: cpqphp: Fix possible NULL pointer dereference
2018-02-25 2:01 [PATCH] PCI: cpqphp: Fix possible NULL pointer dereference Shawn Lin
@ 2018-02-28 20:37 ` Bjorn Helgaas
0 siblings, 0 replies; 2+ messages in thread
From: Bjorn Helgaas @ 2018-02-28 20:37 UTC (permalink / raw)
To: Shawn Lin; +Cc: Bjorn Helgaas, linux-pci
On Sun, Feb 25, 2018 at 10:01:42AM +0800, Shawn Lin wrote:
> io_node is used before verify whether it's null pointer,
> so move the check of null pointer immediately after.
>
> Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Applied to pci/hotplug for v4.17, thanks!
> ---
>
> drivers/pci/hotplug/cpqphp_ctrl.c | 12 +++++-------
> 1 file changed, 5 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/pci/hotplug/cpqphp_ctrl.c b/drivers/pci/hotplug/cpqphp_ctrl.c
> index b1b6e45..616df44 100644
> --- a/drivers/pci/hotplug/cpqphp_ctrl.c
> +++ b/drivers/pci/hotplug/cpqphp_ctrl.c
> @@ -2812,18 +2812,16 @@ static int configure_new_function(struct controller *ctrl, struct pci_func *func
>
> dbg("CND: length = 0x%x\n", base);
> io_node = get_io_resource(&(resources->io_head), base);
> + if (!io_node)
> + return -ENOMEM;
> dbg("Got io_node start = %8.8x, length = %8.8x next (%p)\n",
> io_node->base, io_node->length, io_node->next);
> dbg("func (%p) io_head (%p)\n", func, func->io_head);
>
> /* allocate the resource to the board */
> - if (io_node) {
> - base = io_node->base;
> -
> - io_node->next = func->io_head;
> - func->io_head = io_node;
> - } else
> - return -ENOMEM;
> + base = io_node->base;
> + io_node->next = func->io_head;
> + func->io_head = io_node;
> } else if ((temp_register & 0x0BL) == 0x08) {
> /* Map prefetchable memory */
> base = temp_register & 0xFFFFFFF0;
> --
> 1.9.1
>
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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