Return value of a function 'drm_cvt_mode' is dereferenced without
checking for NULL but drm_mode_create() in drm_cvt_mode() may
return NULL value in case of memory allocation error.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 1b043677d4be ("drm/qxl: add qxl_add_mode helper function")
Signed-off-by: Aleksandr Burakov <a.burakov@xxxxxxxxxxxx>
---
drivers/gpu/drm/qxl/qxl_display.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index a152a7c6db21..447532c29e02 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -236,8 +236,10 @@ static int qxl_add_mode(struct drm_connector *connector,
return 0;
mode = drm_cvt_mode(dev, width, height, 60, false, false, false);
- if (preferred)
+ if (preferred && mode)
mode->type |= DRM_MODE_TYPE_PREFERRED;
+ else
+ return 0;
mode->hdisplay = width;
mode->vdisplay = height;
drm_mode_set_name(mode);
--
2.25.1
