[PATCH v2] drm/amdgpu: fix a possible null pointer dereference

[Markus Elfring]

> In amdgpu_connector_add_common_modes(), the return value of drm_cvt_mode()
> is assigned to mode, which will lead to a NULL pointer dereference on
> failure of drm_cvt_mode(). Add a check to avoid npd.
>
> Fixes: d38ceaf99ed0 ("drm/amdgpu: add core driver (v4)")
> Signed-off-by: Ma Ke <make24 at iscas.ac.cn>

Are you going to adhere to known research and development processes?
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/researcher-guidelines.rst?h=v6.10-rc7#n5

Regards,
Markus