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render: avoid NULL pointer dereference if PictureFindVisual returns NULL

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Found by Oracle Parfait 13.3:
   Null pointer dereference [null-pointer-deref]:
      Read from null pointer pVisual
        at line 257 of dix/colormap.c in function 'CreateColormap'.
          Null pointer introduced at line 412 of render/picture.c in
	   function 'PictureFindVisual'.
          Constant 'NULL' passed into function CreateColormap, argument
	   pVisual, from call at line 431 in function
	   'PictureInitIndexedFormat'.
          Function PictureFindVisual may return constant 'NULL' at
	   line 412, called at line 429.

Fixes: d4a101d4e ("Integration of DAMAGE-XFIXES branch to trunk")
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
(cherry picked from commit 7af077dd2f)

Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1766>
This commit is contained in:
Alan Coopersmith 2024-10-12 16:38:55 -07:00 • committed by Olivier Fourdan
parent cec5c7c3b2
commit 5e320e1193
1 changed files with 3 additions and 0 deletions
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3
render/picture.c
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@ -428,6 +428,9 @@ PictureInitIndexedFormat(ScreenPtr pScreen, PictFormatPtr format)
else {
VisualPtr pVisual = PictureFindVisual(pScreen, format->index.vid);
if (pVisual == NULL)
return FALSE;
if (CreateColormap(FakeClientID(0), pScreen, pVisual,
&format->index.pColormap, AllocNone, 0)
!= Success)