On Wed, 22 May 2019, Gen Zhang <blackgod016574@xxxxxxxxx> wrote:
> In drm_load_edid_firmware(), fwstr is allocated by kstrdup(). And fwstr
> is dereferenced in the following codes. However, memory allocation
> functions such as kstrdup() may fail and returns NULL. Dereferencing
> this null pointer may cause the kernel go wrong. Thus we should check
> this kstrdup() operation.
> Further, if kstrdup() returns NULL, we should return ERR_PTR(-ENOMEM) to
> the caller site.
strsep() handles the NULL pointer just fine, so there won't be a NULL
dereference. However this patch seems like the right thing to do anyway.
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
>
> Signed-off-by: Gen Zhang <blackgod016574@xxxxxxxxx>
>
> ---
> diff --git a/drivers/gpu/drm/drm_edid_load.c b/drivers/gpu/drm/drm_edid_load.c
> index a491509..a0e107a 100644
> --- a/drivers/gpu/drm/drm_edid_load.c
> +++ b/drivers/gpu/drm/drm_edid_load.c
> @@ -290,6 +290,8 @@ struct edid *drm_load_edid_firmware(struct drm_connector *connector)
> * the last one found one as a fallback.
> */
> fwstr = kstrdup(edid_firmware, GFP_KERNEL);
> + if (!fwstr)
> + return ERR_PTR(-ENOMEM);
> edidstr = fwstr;
>
> while ((edidname = strsep(&edidstr, ","))) {
> ---
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--
Jani Nikula, Intel Open Source Graphics Center
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