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qxl-render: add more sanity checks 

Damn, the dirty rectangle values are signed integers.  So the checks
added by commit 788fbf042f are not good
enough, we also have to make sure they are not negative.

[ Note: There must be something broken in spice-server so we get
  negative values in the first place.  Bug opened:
  https://bugzilla.redhat.com/show_bug.cgi?id=1135372 ]

Cc: qemu-stable@nongnu.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Gerd Hoffmann 2014-08-29 09:27:52 +02:00
parent 8b3030114a
commit 503b3b33fe
1 changed files with 3 additions and 1 deletions
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4
hw/display/qxl-render.c
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@ -138,7 +138,9 @@ static void qxl_render_update_area_unlocked(PCIQXLDevice *qxl)
if (qemu_spice_rect_is_empty(qxl->dirty+i)) {
break;
}
if (qxl->dirty[i].left > qxl->dirty[i].right ||
if (qxl->dirty[i].left < 0 ||
qxl->dirty[i].top < 0 ||
qxl->dirty[i].left > qxl->dirty[i].right ||
qxl->dirty[i].top > qxl->dirty[i].bottom ||
qxl->dirty[i].right > qxl->guest_primary.surface.width ||
qxl->dirty[i].bottom > qxl->guest_primary.surface.height) {