From bf25983345ca44aec3dd92c57142be45452bd38a Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Wed, 19 Nov 2014 13:27:28 +0100 Subject: cirrus: don't overflow CirrusVGAState->cirrus_bltbuf Bug-Debian: http://bugs.debian.org/772025 This is CVE-2014-8106. Signed-off-by: Gerd Hoffmann --- 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; -- 1.7.10.4