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qxl: check for kmap failures 

If kmap fails, it leads to memory corruption.

Fixes: f64122c1f6 ('drm: add new QXL driver. (v1.4)')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20160711084633.GA31411@mwanda
This commit is contained in:
Dan Carpenter 2016-07-11 11:46:33 +03:00 committed by Daniel Vetter
parent fb001dfd7e
commit f4cceb2aff
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/qxl/qxl_draw.c
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@ -136,6 +136,8 @@ static int qxl_palette_create_1bit(struct qxl_bo *palette_bo,
* correctly globaly, since that would require
* tracking all of our palettes. */
ret = qxl_bo_kmap(palette_bo, (void **)&pal);
if (ret)
return ret;
pal->num_ents = 2;
pal->unique = unique++;
if (visual == FB_VISUAL_TRUECOLOR || visual == FB_VISUAL_DIRECTCOLOR) {