gpio: syscon: fix a possible NULL dereference
diff mbox

Message ID 1446739355-25849-1-git-send-email-clabbe.montjoie@gmail.com
State New
Headers show

Commit Message

Corentin Labbe Nov. 5, 2015, 4:02 p.m. UTC
of_match_device could return NULL, and so cause a NULL pointer
dereference later at line 199:
priv->flags = of_id->data;

Reported-by: coverity (CID 1324140)
Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
---
 drivers/gpio/gpio-syscon.c | 3 +++
 1 file changed, 3 insertions(+)

Comments

Alexandre Courbot Nov. 9, 2015, 12:23 a.m. UTC | #1
On Fri, Nov 6, 2015 at 1:02 AM, LABBE Corentin
<clabbe.montjoie@gmail.com> wrote:
> of_match_device could return NULL, and so cause a NULL pointer
> dereference later at line 199:
> priv->flags = of_id->data;
>
> Reported-by: coverity (CID 1324140)
> Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>

Same (optional) suggestion as the 74xx-mmio patch.

Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
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Linus Walleij Nov. 17, 2015, 11:01 a.m. UTC | #2
On Thu, Nov 5, 2015 at 5:02 PM, LABBE Corentin
<clabbe.montjoie@gmail.com> wrote:

> of_match_device could return NULL, and so cause a NULL pointer
> dereference later at line 199:
> priv->flags = of_id->data;
>
> Reported-by: coverity (CID 1324140)
> Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>

Patch applied with Alexandre's review tag.

Yours,
Linus Walleij
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Patch
diff mbox

diff --git a/drivers/gpio/gpio-syscon.c b/drivers/gpio/gpio-syscon.c
index 045a952..e673c58 100644
--- a/drivers/gpio/gpio-syscon.c
+++ b/drivers/gpio/gpio-syscon.c
@@ -192,6 +192,9 @@  static int syscon_gpio_probe(struct platform_device *pdev)
 	struct device_node *np = dev->of_node;
 	int ret;
 
+	if (!of_id)
+		return -ENODEV;
+
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;