CVE Request: Out-of-bands write issue found in qemu

[李强 <liqiang6-s () 360 cn>]

Hi,

The qemu has an out-of-bands bug in uart_write() function.

In uart_write() function from hw/char/cadence_uart.c, the ‘offset’ isn’t checked and after it is divided by 4 and used 
to index the ‘r’ array, it will cause an out-of-bands memory write. The value can be controlled by guest and can cause 
the qemu crash or code execution on host.

The patch is here:
https://lists.nongnu.org/archive/html/qemu-devel/2016-04/msg02711.html

Thanks,

Li Qiang of the Cloud Security Team, Qihoo 360 Inc.