* [PATCH v1] libnvdimm, dax: Fix a missing check in nd_dax_probe()
@ 2021-03-17 9:36 wangyingjie55
0 siblings, 0 replies; 6+ messages in thread
From: wangyingjie55 @ 2021-03-17 9:36 UTC (permalink / raw)
To: dan.j.williams, vishal.l.verma, dave.jiang, ira.weiny
Cc: wangyingjie55, linux-nvdimm, linux-kernel
From: Yingjie Wang <wangyingjie55@126.com>
In nd_dax_probe(), 'nd_dax' is allocated by nd_dax_alloc().
nd_dax_alloc() may fail and return NULL, so we should better check
it's return value to avoid a NULL pointer dereference
a bit later in the code.
Fixes: c5ed9268643c ("libnvdimm, dax: autodetect support")
Signed-off-by: Yingjie Wang <wangyingjie55@126.com>
---
drivers/nvdimm/dax_devs.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/nvdimm/dax_devs.c b/drivers/nvdimm/dax_devs.c
index 99965077bac4..b1426ac03f01 100644
--- a/drivers/nvdimm/dax_devs.c
+++ b/drivers/nvdimm/dax_devs.c
@@ -106,6 +106,8 @@ int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns)
nvdimm_bus_lock(&ndns->dev);
nd_dax = nd_dax_alloc(nd_region);
+ if (!nd_dax)
+ return -ENOMEM;
nd_pfn = &nd_dax->nd_pfn;
dax_dev = nd_pfn_devinit(nd_pfn, ndns);
nvdimm_bus_unlock(&ndns->dev);
--
2.7.4
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* Re: [PATCH v1] libnvdimm, dax: Fix a missing check in nd_dax_probe()
2021-04-10 0:33 wangyingjie55
@ 2021-04-10 4:54 ` Dan Williams
0 siblings, 0 replies; 6+ messages in thread
From: Dan Williams @ 2021-04-10 4:54 UTC (permalink / raw)
To: wangyingjie55; +Cc: linux-nvdimm, Linux Kernel Mailing List
On Fri, Apr 9, 2021 at 5:33 PM <wangyingjie55@126.com> wrote:
>
> From: Yingjie Wang <wangyingjie55@126.com>
>
> In nd_dax_probe(), nd_dax_alloc() may fail and return NULL.
> Check for NULL before attempting to
> use nd_dax to avoid a NULL pointer dereference.
>
> Fixes: c5ed9268643c ("libnvdimm, dax: autodetect support")
> Signed-off-by: Yingjie Wang <wangyingjie55@126.com>
> ---
> drivers/nvdimm/dax_devs.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/nvdimm/dax_devs.c b/drivers/nvdimm/dax_devs.c
> index 99965077bac4..b1426ac03f01 100644
> --- a/drivers/nvdimm/dax_devs.c
> +++ b/drivers/nvdimm/dax_devs.c
> @@ -106,6 +106,8 @@ int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns)
>
> nvdimm_bus_lock(&ndns->dev);
hmmm...
> nd_dax = nd_dax_alloc(nd_region);
> + if (!nd_dax)
> + return -ENOMEM;
Can you spot the bug this introduces? See the hint above.
> nd_pfn = &nd_dax->nd_pfn;
> dax_dev = nd_pfn_devinit(nd_pfn, ndns);
> nvdimm_bus_unlock(&ndns->dev);
> --
> 2.7.4
>
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* [PATCH v1] libnvdimm, dax: Fix a missing check in nd_dax_probe()
@ 2021-04-10 0:33 wangyingjie55
2021-04-10 4:54 ` Dan Williams
0 siblings, 1 reply; 6+ messages in thread
From: wangyingjie55 @ 2021-04-10 0:33 UTC (permalink / raw)
To: dan.j.williams, vishal.l.verma, dave.jiang, ira.weiny, linux-nvdimm
Cc: wangyingjie55, linux-kernel
From: Yingjie Wang <wangyingjie55@126.com>
In nd_dax_probe(), nd_dax_alloc() may fail and return NULL.
Check for NULL before attempting to
use nd_dax to avoid a NULL pointer dereference.
Fixes: c5ed9268643c ("libnvdimm, dax: autodetect support")
Signed-off-by: Yingjie Wang <wangyingjie55@126.com>
---
drivers/nvdimm/dax_devs.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/nvdimm/dax_devs.c b/drivers/nvdimm/dax_devs.c
index 99965077bac4..b1426ac03f01 100644
--- a/drivers/nvdimm/dax_devs.c
+++ b/drivers/nvdimm/dax_devs.c
@@ -106,6 +106,8 @@ int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns)
nvdimm_bus_lock(&ndns->dev);
nd_dax = nd_dax_alloc(nd_region);
+ if (!nd_dax)
+ return -ENOMEM;
nd_pfn = &nd_dax->nd_pfn;
dax_dev = nd_pfn_devinit(nd_pfn, ndns);
nvdimm_bus_unlock(&ndns->dev);
--
2.7.4
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* Re: [PATCH v1] libnvdimm, dax: Fix a missing check in nd_dax_probe()
2021-04-09 1:58 wangyingjie55
@ 2021-04-09 16:41 ` Ira Weiny
0 siblings, 0 replies; 6+ messages in thread
From: Ira Weiny @ 2021-04-09 16:41 UTC (permalink / raw)
To: wangyingjie55; +Cc: linux-nvdimm, linux-kernel
On Thu, Apr 08, 2021 at 06:58:26PM -0700, wangyingjie55@126.com wrote:
> From: Yingjie Wang <wangyingjie55@126.com>
>
> In nd_dax_probe(), 'nd_dax' is allocated by nd_dax_alloc().
> nd_dax_alloc() may fail and return NULL, so we should better check
Avoid the use of 'we'.
> it's return value to avoid a NULL pointer dereference
> a bit later in the code.
How about:
"nd_dax_alloc() may fail and return NULL. Check for NULL before attempting to
use nd_dax to avoid a NULL pointer dereference."
>
> Fixes: c5ed9268643c ("libnvdimm, dax: autodetect support")
> Signed-off-by: Yingjie Wang <wangyingjie55@126.com>
The code looks good though.
Ira
> ---
> drivers/nvdimm/dax_devs.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/nvdimm/dax_devs.c b/drivers/nvdimm/dax_devs.c
> index 99965077bac4..b1426ac03f01 100644
> --- a/drivers/nvdimm/dax_devs.c
> +++ b/drivers/nvdimm/dax_devs.c
> @@ -106,6 +106,8 @@ int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns)
>
> nvdimm_bus_lock(&ndns->dev);
> nd_dax = nd_dax_alloc(nd_region);
> + if (!nd_dax)
> + return -ENOMEM;
> nd_pfn = &nd_dax->nd_pfn;
> dax_dev = nd_pfn_devinit(nd_pfn, ndns);
> nvdimm_bus_unlock(&ndns->dev);
> --
> 2.7.4
>
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* [PATCH v1] libnvdimm, dax: Fix a missing check in nd_dax_probe()
@ 2021-04-09 1:58 wangyingjie55
2021-04-09 16:41 ` Ira Weiny
0 siblings, 1 reply; 6+ messages in thread
From: wangyingjie55 @ 2021-04-09 1:58 UTC (permalink / raw)
To: dan.j.williams, vishal.l.verma, dave.jiang, ira.weiny, linux-nvdimm
Cc: wangyingjie55, linux-kernel
From: Yingjie Wang <wangyingjie55@126.com>
In nd_dax_probe(), 'nd_dax' is allocated by nd_dax_alloc().
nd_dax_alloc() may fail and return NULL, so we should better check
it's return value to avoid a NULL pointer dereference
a bit later in the code.
Fixes: c5ed9268643c ("libnvdimm, dax: autodetect support")
Signed-off-by: Yingjie Wang <wangyingjie55@126.com>
---
drivers/nvdimm/dax_devs.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/nvdimm/dax_devs.c b/drivers/nvdimm/dax_devs.c
index 99965077bac4..b1426ac03f01 100644
--- a/drivers/nvdimm/dax_devs.c
+++ b/drivers/nvdimm/dax_devs.c
@@ -106,6 +106,8 @@ int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns)
nvdimm_bus_lock(&ndns->dev);
nd_dax = nd_dax_alloc(nd_region);
+ if (!nd_dax)
+ return -ENOMEM;
nd_pfn = &nd_dax->nd_pfn;
dax_dev = nd_pfn_devinit(nd_pfn, ndns);
nvdimm_bus_unlock(&ndns->dev);
--
2.7.4
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* [PATCH v1] libnvdimm, dax: Fix a missing check in nd_dax_probe()
@ 2021-03-17 9:32 wangyingjie55
0 siblings, 0 replies; 6+ messages in thread
From: wangyingjie55 @ 2021-03-17 9:32 UTC (permalink / raw)
To: dan.j.williams, vishal.l.verma, dave.jiang, ira.weiny
Cc: wangyingjie55, linux-nvdimm, linux-kernel
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset=y, Size: 942 bytes --]
From: Yingjie Wang <wangyingjie55@126.com>
In nd_dax_probe(), 'nd_dax' is allocated by nd_dax_alloc().
nd_dax_alloc() may fail and return NULL, so we should better check
it's return value to avoid a NULL pointer dereference
a bit later in the code.
Fixes: c5ed9268643c ("libnvdimm, dax: autodetect support")
Signed-off-by: Yingjie Wang <wangyingjie55@126.com>
---
drivers/nvdimm/dax_devs.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/nvdimm/dax_devs.c b/drivers/nvdimm/dax_devs.c
index 99965077bac4..b1426ac03f01 100644
--- a/drivers/nvdimm/dax_devs.c
+++ b/drivers/nvdimm/dax_devs.c
@@ -106,6 +106,8 @@ int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns)
nvdimm_bus_lock(&ndns->dev);
nd_dax = nd_dax_alloc(nd_region);
+ if (!nd_dax)
+ return -ENOMEM;
nd_pfn = &nd_dax->nd_pfn;
dax_dev = nd_pfn_devinit(nd_pfn, ndns);
nvdimm_bus_unlock(&ndns->dev);
--
2.7.4
[-- Attachment #2: Type: text/plain, Size: 167 bytes --]
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2021-04-10 0:33 wangyingjie55
2021-04-10 4:54 ` Dan Williams
2021-04-09 1:58 wangyingjie55
2021-04-09 16:41 ` Ira Weiny
2021-03-17 9:32 wangyingjie55
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