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drm/radeon: fix a possible null pointer dereference 

[ Upstream commit 2c1fe3c480f9e1deefd50d4b18be4a046011ee1f ]

In radeon_tv_get_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 null point dereference.

Signed-off-by: Ma Ke <make_ruc2021@163.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ma Ke 2023-10-11 09:21:43 +08:00 committed by Greg Kroah-Hartman
parent eaede6900c
commit c0fe7aacc3
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/radeon/radeon_connectors.c
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@ -1119,6 +1119,8 @@ static int radeon_tv_get_modes(struct drm_connector *connector)
else {
/* only 800x600 is supported right now on pre-avivo chips */
tv_mode = drm_cvt_mode(dev, 800, 600, 60, false, false, false);
if (!tv_mode)
return 0;
tv_mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
drm_mode_probed_add(connector, tv_mode);
}