From: José Expósito jose.exposito89@gmail.com
commit 978ffac878fd64039f95798b15b430032d2d89d5 upstream.
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") Reviewed-by: Harry Wentland harry.wentland@amd.com Signed-off-by: José Expósito jose.exposito89@gmail.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -653,7 +653,7 @@ void dmub_hpd_callback(struct amdgpu_dev 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; @@ -670,6 +670,7 @@ void dmub_hpd_callback(struct amdgpu_dev
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) {