On 2022-01-09 13:42, José Expósito wrote:
> The function performs a check on the "adev" input parameter, however, it
> is used before the check.
>
> Initialize the "dev" variable after the sanity check to avoid a possible
> NULL pointer dereference.
>
> Fixes: e27c41d5b0681 ("drm/amd/display: Support for DMUB HPD interrupt
> handling")
> Addresses-Coverity-ID: 1493909 ("Null pointer dereference")
> Signed-off-by: José Expósito <jose.exposit...@gmail.com>
Reviewed-by: Harry Wentland <harry.wentl...@amd.com>
Harry
> ---
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index e727f1dd2a9a..7fbded7a6d9c 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -656,7 +656,7 @@ void dmub_hpd_callback(struct amdgpu_device *adev, struct
> dmub_notification *not
> struct drm_connector_list_iter iter;
> struct dc_link *link;
> uint8_t link_index = 0;
> - struct drm_device *dev = adev->dm.ddev;
> + struct drm_device *dev;
>
> if (adev == NULL)
> return;
> @@ -673,6 +673,7 @@ void dmub_hpd_callback(struct amdgpu_device *adev, struct
> dmub_notification *not
>
> link_index = notify->link_index;
> link = adev->dm.dc->links[link_index];
> + dev = adev->dm.ddev;
>
> drm_connector_list_iter_begin(dev, &iter);
> drm_for_each_connector_iter(connector, &iter) {
