[Qemu-devel] [PULL 2/2] cirrus: don't overflow CirrusVGAState->cirrus_bltbuf

[Gerd Hoffmann <kraxel@redhat.com>]

This is CVE-2014-8106.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/display/cirrus_vga.c | 4 ++++
 1 file changed, 4 insertions(+)

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 @@ static bool blit_is_unsafe(struct CirrusVGAState *s)
     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;
-- 
1.8.3.1