qxl: check for kmap failures

If kmap fails, it leads to memory corruption. Fixes: f64122c ('drm: add new QXL driver. (v1.4)') Signed-off-by: Dan Carpenter <[email protected]> Signed-off-by: Daniel Vetter <[email protected]> Link: http://patchwork.freedesktop.org/patch/msgid/20160711084633.GA31411@mwanda
bkrepo · Jul 12, 2016 · f4cceb2 · f4cceb2
1 parent fb001df
commit f4cceb2
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/drivers/gpu/drm/qxl/qxl_draw.c b/drivers/gpu/drm/qxl/qxl_draw.c
@@ -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) {