vmsvga: add more fifo checks
Make sure all fifo ptrs are within range. Fixes: CVE-2016-4454 Cc: qemu-stable@nongnu.org Cc: P J P <ppandit@redhat.com> Reported-by: N李强 <liqiang6-s@360.cn> Signed-off-by: NGerd Hoffmann <kraxel@redhat.com> Message-id: 1464592161-18348-3-git-send-email-kraxel@redhat.com
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