[Secure-testing-team] Bug#813193: CVE-2016-2198: usb: ehci null pointer dereference in ehci_caps_write

[Michael Tokarev]

Source: qemu
Version: 1:2.1+dfsg-1
Severity: important
Tags: security upstream patch

CVE-2016-2198 has been assigned to the following flaw
http://www.openwall.com/lists/oss-security/2016/01/29/6 :

---
Qemu emulator built with the USB EHCI emulation support is vulnerable
to a null pointer dereference flaw. It could occur when an application
attempts to write to EHCI capabilities registers.

A privileged user inside quest could use this flaw to crash the Qemu
process instance resulting in DoS.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg05899.html

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1301643

This issue was discovered by Mr Zuozhi Fzz of Alibaba Inc.