commit bf25983345ca44aec3dd92c57142be45452bd38a
author Gerd Hoffmann <kraxel@redhat.com> Wed Nov 19 13:27:28 2014 +0100
committer Gerd Hoffmann <kraxel@redhat.com> Mon Dec 01 10:25:46 2014 +0100
tree 2e2b151748b5be8420cb97b7b75ff05e80b9954c
parent d3532a0db02296e687711b8cdc7791924efccea0

cirrus: don't overflow CirrusVGAState->cirrus_bltbuf

This is CVE-2014-8106.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

hw/display/cirrus_vga.c

diff --git a/hw/display/cirrus_vga.c b/hw/display/cirrus_vga.c
index d54fb06..2725264 100644
--- a/hw/display/cirrus_vga.c
+++ b/hw/display/cirrus_vga.c
@@ -293,6 +293,10 @@
     assert(s->cirrus_blt_width > 0);
     assert(s->cirrus_blt_height > 0);
 
+    if (s->cirrus_blt_width > CIRRUS_BLTBUFSIZE) {
+        return true;
+    }
+
     if (blit_region_is_unsafe(s, s->cirrus_blt_dstpitch,
                               s->cirrus_blt_dstaddr & s->cirrus_addr_mask)) {
         return true;