* [PATCH] drm/nouveau/therm: Fix pointer dereferenced before checking
@ 2022-05-30 3:10 Haowen Bai
2022-05-31 1:38 ` baihaowen
0 siblings, 1 reply; 2+ messages in thread
From: Haowen Bai @ 2022-05-30 3:10 UTC (permalink / raw)
To: Ben Skeggs, Karol Herbst, Lyude Paul, David Airlie, Daniel Vetter
Cc: Haowen Bai, dri-devel, nouveau, linux-kernel
The fan->base is dereferencing before null checking, so move
it after checking.
Signed-off-by: Haowen Bai <baihaowen@meizu.com>
---
drivers/gpu/drm/nouveau/nvkm/subdev/therm/fanpwm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fanpwm.c b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fanpwm.c
index 340f37a299dc..b13ba9b2f6be 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fanpwm.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fanpwm.c
@@ -98,10 +98,10 @@ nvkm_fanpwm_create(struct nvkm_therm *therm, struct dcb_gpio_func *func)
return -ENODEV;
fan = kzalloc(sizeof(*fan), GFP_KERNEL);
- therm->fan = &fan->base;
if (!fan)
return -ENOMEM;
+ therm->fan = &fan->base;
fan->base.type = "PWM";
fan->base.get = nvkm_fanpwm_get;
fan->base.set = nvkm_fanpwm_set;
--
2.7.4
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] drm/nouveau/therm: Fix pointer dereferenced before checking
2022-05-30 3:10 [PATCH] drm/nouveau/therm: Fix pointer dereferenced before checking Haowen Bai
@ 2022-05-31 1:38 ` baihaowen
0 siblings, 0 replies; 2+ messages in thread
From: baihaowen @ 2022-05-31 1:38 UTC (permalink / raw)
To: Ben Skeggs, Karol Herbst, Lyude Paul, David Airlie, Daniel Vetter
Cc: dri-devel, nouveau, linux-kernel
在 2022/5/30 上午11:10, Haowen Bai 写道:
> The fan->base is dereferencing before null checking, so move
> it after checking.
>
> Signed-off-by: Haowen Bai <baihaowen@meizu.com>
> ---
> drivers/gpu/drm/nouveau/nvkm/subdev/therm/fanpwm.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fanpwm.c b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fanpwm.c
> index 340f37a299dc..b13ba9b2f6be 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fanpwm.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fanpwm.c
> @@ -98,10 +98,10 @@ nvkm_fanpwm_create(struct nvkm_therm *therm, struct dcb_gpio_func *func)
> return -ENODEV;
>
> fan = kzalloc(sizeof(*fan), GFP_KERNEL);
> - therm->fan = &fan->base;
> if (!fan)
> return -ENOMEM;
>
> + therm->fan = &fan->base;
> fan->base.type = "PWM";
> fan->base.get = nvkm_fanpwm_get;
> fan->base.set = nvkm_fanpwm_set;
Sorry, plz ignore this patch.
fan->base is dereferenced, &fan->base is just a pointer math for pointer address offset, so it would not cause a bug(dereferencing null pointer).
--
Haowen Bai
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2022-05-31 1:38 UTC | newest]
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2022-05-30 3:10 [PATCH] drm/nouveau/therm: Fix pointer dereferenced before checking Haowen Bai
2022-05-31 1:38 ` baihaowen
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