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drm: NULL pointer dereference [null-pointer-deref] (CWE 476) problem 

The Parfait (version 2.1.0) static code analysis tool found the
following NULL pointer derefernce problem.

- drivers/gpu/drm/drm_edid.c
The call to drm_cvt_mode() in function drm_mode_std() for the
HDTV hack resulted in the possibility of accessing a NULL pointer
if drm_mode_std() returned NULL.  A check for this added right after
the call to drm_cvt_mode() in this particular area of code.

Signed-off-by: Joe Moriarty <joe.moriarty@oracle.com>
Reviewed-by: Steven Sistare <steven.sistare@oracle.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180212195144.98323-4-joe.moriarty@oracle.com
This commit is contained in:
Joe Moriarty 2018-02-12 14:51:43 -05:00 committed by Daniel Vetter
parent 22a07038c0
commit a5ef656736
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/drm_edid.c
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@ -2083,6 +2083,8 @@ drm_mode_std(struct drm_connector *connector, struct edid *edid,
if (hsize == 1366 && vsize == 768 && vrefresh_rate == 60) {
mode = drm_cvt_mode(dev, 1366, 768, vrefresh_rate, 0, 0,
false);
if (!mode)
return NULL;
mode->hdisplay = 1366;
mode->hsync_start = mode->hsync_start - 1;
mode->hsync_end = mode->hsync_end - 1;