[PATCH v2] net: dsa: vsc73xx: Add null pointer check to vsc73xx_gpio_probe

[PATCH v2] net: dsa: vsc73xx: Add null pointer check to vsc73xx_gpio_probe

[Kunwu Chan]

devm_kasprintf() returns a pointer to dynamically allocated memory
which can be NULL upon failure.

Cc: Kunwu Chan <kunwu.chan@hotmail.com>
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
Suggested-by: Jakub Kicinski <kuba@kernel.org>

---
v2: Remove error print
---
 drivers/net/dsa/vitesse-vsc73xx-core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/dsa/vitesse-vsc73xx-core.c b/drivers/net/dsa/vitesse-vsc73xx-core.c
index e6f29e4e508c..571f037fe649 100644
--- a/drivers/net/dsa/vitesse-vsc73xx-core.c
+++ b/drivers/net/dsa/vitesse-vsc73xx-core.c
@@ -1135,6 +1135,8 @@ static int vsc73xx_gpio_probe(struct vsc73xx *vsc)
 
 	vsc->gc.label = devm_kasprintf(vsc->dev, GFP_KERNEL, "VSC%04x",
 				       vsc->chipid);
+	if (!vsc->gc.label)
+		return -ENOMEM;
 	vsc->gc.ngpio = 4;
 	vsc->gc.owner = THIS_MODULE;
 	vsc->gc.parent = vsc->dev;
-- 
2.39.2

Re: [PATCH v2] net: dsa: vsc73xx: Add null pointer check to vsc73xx_gpio_probe

[Simon Horman]

On Thu, Jan 11, 2024 at 03:20:18PM +0800, Kunwu Chan wrote:
> devm_kasprintf() returns a pointer to dynamically allocated memory
> which can be NULL upon failure.
> 
> Cc: Kunwu Chan <kunwu.chan@hotmail.com>
> Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
> Suggested-by: Jakub Kicinski <kuba@kernel.org>

Hi Kunwu,

This seems to be a bug fix. If so it should have a fixes tag.
Perhaps this one is correct?

	Fixes: 05bd97fc559d ("net: dsa: Add Vitesse VSC73xx DSA router driver")

And, be targeted against net (as opposed to net-next)

	Subject: [PATCH net v2] ...

It is probably not necessary to repost to address these minor issues,
but please keep this in mind in future.

The above notwithstanding,

Reviewed-by: Simon Horman <horms@kernel.org>

Re: [PATCH v2] net: dsa: vsc73xx: Add null pointer check to vsc73xx_gpio_probe

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Thu, 11 Jan 2024 15:20:18 +0800 you wrote:
> devm_kasprintf() returns a pointer to dynamically allocated memory
> which can be NULL upon failure.
> 
> Cc: Kunwu Chan <kunwu.chan@hotmail.com>
> Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
> Suggested-by: Jakub Kicinski <kuba@kernel.org>
> 
> [...]

Here is the summary with links:
  - [v2] net: dsa: vsc73xx: Add null pointer check to vsc73xx_gpio_probe
    https://git.kernel.org/netdev/net/c/776dac5a6627

You are awesome, thank you!
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