cirrus: fix oob access issue (CVE-2017-2615)
When doing bitblt copy in backward mode, we should minus the blt width first just like the adding in the forward mode. This can avoid the oob access of the front of vga's vram. Signed-off-by: NLi Qiang <liqiang6-s@360.cn> { kraxel: with backward blits (negative pitch) addr is the topmost address, so check it as-is against vram size ] Cc: qemu-stable@nongnu.org Cc: P J P <ppandit@redhat.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Wolfgang Bumiller <w.bumiller@proxmox.com> Fixes: d3532a0d (CVE-2014-8106) Signed-off-by: NGerd Hoffmann <kraxel@redhat.com> Message-id: 1485938101-26602-1-git-send-email-kraxel@redhat.com Reviewed-by: NLaszlo Ersek <lersek@redhat.com>
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