In QEMU 1:4.1-1, 1:2.1+dfsg-12+deb8u6, 1:2.8+dfsg-6+deb9u8, 1:3.1+dfsg-8~deb10u1, 1:3.1+dfsg-8+deb10u2, and 1:2.1+dfsg-12+deb8u12 (fixed), when executing script in lsi_execute_script(), the LSI scsi adapter emulator advances ‘s->dsp’ index to read next opcode. This can lead to an infinite loop if the next opcode is empty. Move the existing loop exit after 10k iterations so that it covers no-op opcodes as well.
lists.opensuse.org/opensuse-security-announce/2019-11/msg00034.html
lists.opensuse.org/opensuse-security-announce/2019-11/msg00038.html
git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=de594e47659029316bbf9391efb79da0a1a08e08
lists.debian.org/debian-lts-announce/2019/09/msg00021.html
lists.debian.org/debian-lts-announce/2020/07/msg00020.html
lists.gnu.org/archive/html/qemu-devel/2019-08/msg01518.html
security-tracker.debian.org/tracker/CVE-2019-12068
usn.ubuntu.com/4191-1/
usn.ubuntu.com/4191-2/
www.debian.org/security/2020/dsa-4665