qemu -- denial of service vulnerability in IDE disk/CD/DVD-ROM emulation

Prasad J Pandit, Red Hat Product Security Team, reports:

Qemu emulator built with the IDE disk and CD/DVD-ROM emulation
support is vulnerable to a divide by zero issue. It could occur
while executing an IDE command WIN_READ_NATIVE_MAX to determine
the maximum size of a drive.
A privileged user inside guest could use this flaw to crash the
Qemu instance resulting in DoS.