* [PATCH] mtd: rawnand: atmel: Fix potential NULL pointer dereference
@ 2018-09-18 13:33 ` Gustavo A. R. Silva
0 siblings, 0 replies; 6+ messages in thread
From: Gustavo A. R. Silva @ 2018-09-18 13:33 UTC (permalink / raw)
To: Tudor Ambarus, Boris Brezillon, Miquel Raynal,
Richard Weinberger, David Woodhouse, Brian Norris, Marek Vasut,
Nicolas Ferre, Alexandre Belloni, Ludovic Desroches
Cc: linux-mtd, linux-arm-kernel, linux-kernel, Gustavo A. R. Silva
There is a potential execution path in which function
of_find_compatible_node() returns NULL. In such a case,
we end up having a NULL pointer dereference when accessing
pointer *nfc_np* in function of_clk_get().
So, we better don't take any chances and fix this by null
checking pointer *nfc_np* before calling of_clk_get().
Addresses-Coverity-ID: 1473052 ("Dereference null return value")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
drivers/mtd/nand/raw/atmel/nand-controller.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c
index a38633a..ffa0c6b6 100644
--- a/drivers/mtd/nand/raw/atmel/nand-controller.c
+++ b/drivers/mtd/nand/raw/atmel/nand-controller.c
@@ -2035,6 +2035,11 @@ atmel_hsmc_nand_controller_legacy_init(struct atmel_hsmc_nand_controller *nc)
nfc_np = of_find_compatible_node(dev->of_node, NULL,
"atmel,sama5d3-nfc");
+ if (!nfc_np) {
+ dev_err(dev, "Could not find device node for sama5d3-nfc\n");
+ return -ENODEV;
+ }
+
nc->clk = of_clk_get(nfc_np, 0);
if (IS_ERR(nc->clk)) {
ret = PTR_ERR(nc->clk);
--
2.7.4
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH] mtd: rawnand: atmel: Fix potential NULL pointer dereference
@ 2018-09-18 13:33 ` Gustavo A. R. Silva
0 siblings, 0 replies; 6+ messages in thread
From: Gustavo A. R. Silva @ 2018-09-18 13:33 UTC (permalink / raw)
To: linux-arm-kernel
There is a potential execution path in which function
of_find_compatible_node() returns NULL. In such a case,
we end up having a NULL pointer dereference when accessing
pointer *nfc_np* in function of_clk_get().
So, we better don't take any chances and fix this by null
checking pointer *nfc_np* before calling of_clk_get().
Addresses-Coverity-ID: 1473052 ("Dereference null return value")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
drivers/mtd/nand/raw/atmel/nand-controller.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c
index a38633a..ffa0c6b6 100644
--- a/drivers/mtd/nand/raw/atmel/nand-controller.c
+++ b/drivers/mtd/nand/raw/atmel/nand-controller.c
@@ -2035,6 +2035,11 @@ atmel_hsmc_nand_controller_legacy_init(struct atmel_hsmc_nand_controller *nc)
nfc_np = of_find_compatible_node(dev->of_node, NULL,
"atmel,sama5d3-nfc");
+ if (!nfc_np) {
+ dev_err(dev, "Could not find device node for sama5d3-nfc\n");
+ return -ENODEV;
+ }
+
nc->clk = of_clk_get(nfc_np, 0);
if (IS_ERR(nc->clk)) {
ret = PTR_ERR(nc->clk);
--
2.7.4
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] mtd: rawnand: atmel: Fix potential NULL pointer dereference
2018-09-18 13:33 ` Gustavo A. R. Silva
@ 2018-09-18 13:40 ` Boris Brezillon
-1 siblings, 0 replies; 6+ messages in thread
From: Boris Brezillon @ 2018-09-18 13:40 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
David Woodhouse, Brian Norris, Marek Vasut, Nicolas Ferre,
Alexandre Belloni, Ludovic Desroches, linux-mtd,
linux-arm-kernel, linux-kernel
Hi Gustavo,
On Tue, 18 Sep 2018 08:33:17 -0500
"Gustavo A. R. Silva" <gustavo@embeddedor.com> wrote:
> There is a potential execution path in which function
> of_find_compatible_node() returns NULL. In such a case,
> we end up having a NULL pointer dereference when accessing
> pointer *nfc_np* in function of_clk_get().
>
> So, we better don't take any chances and fix this by null
> checking pointer *nfc_np* before calling of_clk_get().
>
> Addresses-Coverity-ID: 1473052 ("Dereference null return value")
Can you add a Fixes tag here?
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
> ---
> drivers/mtd/nand/raw/atmel/nand-controller.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c
> index a38633a..ffa0c6b6 100644
> --- a/drivers/mtd/nand/raw/atmel/nand-controller.c
> +++ b/drivers/mtd/nand/raw/atmel/nand-controller.c
> @@ -2035,6 +2035,11 @@ atmel_hsmc_nand_controller_legacy_init(struct atmel_hsmc_nand_controller *nc)
> nfc_np = of_find_compatible_node(dev->of_node, NULL,
> "atmel,sama5d3-nfc");
>
Can you drop this blank line?
> + if (!nfc_np) {
> + dev_err(dev, "Could not find device node for sama5d3-nfc\n");
> + return -ENODEV;
> + }
> +
> nc->clk = of_clk_get(nfc_np, 0);
> if (IS_ERR(nc->clk)) {
> ret = PTR_ERR(nc->clk);
Thanks,
Boris
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH] mtd: rawnand: atmel: Fix potential NULL pointer dereference
@ 2018-09-18 13:40 ` Boris Brezillon
0 siblings, 0 replies; 6+ messages in thread
From: Boris Brezillon @ 2018-09-18 13:40 UTC (permalink / raw)
To: linux-arm-kernel
Hi Gustavo,
On Tue, 18 Sep 2018 08:33:17 -0500
"Gustavo A. R. Silva" <gustavo@embeddedor.com> wrote:
> There is a potential execution path in which function
> of_find_compatible_node() returns NULL. In such a case,
> we end up having a NULL pointer dereference when accessing
> pointer *nfc_np* in function of_clk_get().
>
> So, we better don't take any chances and fix this by null
> checking pointer *nfc_np* before calling of_clk_get().
>
> Addresses-Coverity-ID: 1473052 ("Dereference null return value")
Can you add a Fixes tag here?
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
> ---
> drivers/mtd/nand/raw/atmel/nand-controller.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c
> index a38633a..ffa0c6b6 100644
> --- a/drivers/mtd/nand/raw/atmel/nand-controller.c
> +++ b/drivers/mtd/nand/raw/atmel/nand-controller.c
> @@ -2035,6 +2035,11 @@ atmel_hsmc_nand_controller_legacy_init(struct atmel_hsmc_nand_controller *nc)
> nfc_np = of_find_compatible_node(dev->of_node, NULL,
> "atmel,sama5d3-nfc");
>
Can you drop this blank line?
> + if (!nfc_np) {
> + dev_err(dev, "Could not find device node for sama5d3-nfc\n");
> + return -ENODEV;
> + }
> +
> nc->clk = of_clk_get(nfc_np, 0);
> if (IS_ERR(nc->clk)) {
> ret = PTR_ERR(nc->clk);
Thanks,
Boris
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] mtd: rawnand: atmel: Fix potential NULL pointer dereference
2018-09-18 13:40 ` Boris Brezillon
@ 2018-09-18 13:44 ` Gustavo A. R. Silva
-1 siblings, 0 replies; 6+ messages in thread
From: Gustavo A. R. Silva @ 2018-09-18 13:44 UTC (permalink / raw)
To: Boris Brezillon
Cc: Tudor Ambarus, Miquel Raynal, Richard Weinberger,
David Woodhouse, Brian Norris, Marek Vasut, Nicolas Ferre,
Alexandre Belloni, Ludovic Desroches, linux-mtd,
linux-arm-kernel, linux-kernel
Hi Boris,
On 9/18/18 8:40 AM, Boris Brezillon wrote:
> Hi Gustavo,
>
> On Tue, 18 Sep 2018 08:33:17 -0500
> "Gustavo A. R. Silva" <gustavo@embeddedor.com> wrote:
>
>> There is a potential execution path in which function
>> of_find_compatible_node() returns NULL. In such a case,
>> we end up having a NULL pointer dereference when accessing
>> pointer *nfc_np* in function of_clk_get().
>>
>> So, we better don't take any chances and fix this by null
>> checking pointer *nfc_np* before calling of_clk_get().
>>
>> Addresses-Coverity-ID: 1473052 ("Dereference null return value")
>
> Can you add a Fixes tag here?
>
Yep.
>> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
>> ---
>> drivers/mtd/nand/raw/atmel/nand-controller.c | 5 +++++
>> 1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c
>> index a38633a..ffa0c6b6 100644
>> --- a/drivers/mtd/nand/raw/atmel/nand-controller.c
>> +++ b/drivers/mtd/nand/raw/atmel/nand-controller.c
>> @@ -2035,6 +2035,11 @@ atmel_hsmc_nand_controller_legacy_init(struct atmel_hsmc_nand_controller *nc)
>> nfc_np = of_find_compatible_node(dev->of_node, NULL,
>> "atmel,sama5d3-nfc");
>>
>
> Can you drop this blank line?
>
OK. Sure thing.
I'll send v2 shortly.
Thanks for the feedback.
--
Gustavo
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH] mtd: rawnand: atmel: Fix potential NULL pointer dereference
@ 2018-09-18 13:44 ` Gustavo A. R. Silva
0 siblings, 0 replies; 6+ messages in thread
From: Gustavo A. R. Silva @ 2018-09-18 13:44 UTC (permalink / raw)
To: linux-arm-kernel
Hi Boris,
On 9/18/18 8:40 AM, Boris Brezillon wrote:
> Hi Gustavo,
>
> On Tue, 18 Sep 2018 08:33:17 -0500
> "Gustavo A. R. Silva" <gustavo@embeddedor.com> wrote:
>
>> There is a potential execution path in which function
>> of_find_compatible_node() returns NULL. In such a case,
>> we end up having a NULL pointer dereference when accessing
>> pointer *nfc_np* in function of_clk_get().
>>
>> So, we better don't take any chances and fix this by null
>> checking pointer *nfc_np* before calling of_clk_get().
>>
>> Addresses-Coverity-ID: 1473052 ("Dereference null return value")
>
> Can you add a Fixes tag here?
>
Yep.
>> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
>> ---
>> drivers/mtd/nand/raw/atmel/nand-controller.c | 5 +++++
>> 1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c
>> index a38633a..ffa0c6b6 100644
>> --- a/drivers/mtd/nand/raw/atmel/nand-controller.c
>> +++ b/drivers/mtd/nand/raw/atmel/nand-controller.c
>> @@ -2035,6 +2035,11 @@ atmel_hsmc_nand_controller_legacy_init(struct atmel_hsmc_nand_controller *nc)
>> nfc_np = of_find_compatible_node(dev->of_node, NULL,
>> "atmel,sama5d3-nfc");
>>
>
> Can you drop this blank line?
>
OK. Sure thing.
I'll send v2 shortly.
Thanks for the feedback.
--
Gustavo
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2018-09-18 13:45 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-09-18 13:33 [PATCH] mtd: rawnand: atmel: Fix potential NULL pointer dereference Gustavo A. R. Silva
2018-09-18 13:33 ` Gustavo A. R. Silva
2018-09-18 13:40 ` Boris Brezillon
2018-09-18 13:40 ` Boris Brezillon
2018-09-18 13:44 ` Gustavo A. R. Silva
2018-09-18 13:44 ` Gustavo A. R. Silva
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