| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 72/73] qxl: check for kmap failures | Date | Wed, 28 Sep 2016 11:05:42 +0200 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter <dan.carpenter@oracle.com>
commit f4cceb2affcd1285d4ce498089e8a79f4cd2fa66 upstream.
If kmap fails, it leads to memory corruption.
Fixes: f64122c1f6ad ('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 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/gpu/drm/qxl/qxl_draw.c | 2 ++ 1 file changed, 2 insertions(+)
--- 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(struc * 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) {
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