qemu: multiple vulnerabilities

CVE-2014-0223: Qemu block driver for the QCOW version 1 image format is vulnerable to an integer overflow flaw. It occurs due to weak input validations or logic errors. Such integer overflow could lead to buffer overflows, memory corruption or crash in Qemu instance.

An user able to alter the Qemu disk image files loaded by a guest could use this flaw to crash the Qemu instance resulting in DoS or corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process.

CVE-2014-0222: Qemu block driver for the QCOW version 1 image format is vulnerable to an integer overflow flaw. It occurs due to weak input validations or logic errors. Such integer overflow could lead to buffer overflows, memory corruption or crash in Qemu instance.

An user able to alter the Qemu disk image files loaded by a guest could use this flaw to crash the Qemu instance resulting in DoS or corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process.

CVE-2014-3461: Correct post load checks:

1. dev->setup_len == sizeof(dev->data_buf) seems fine, no need to fail migration
2. When state is DATA, passing index > len will cause memcpy with negative length, resulting in heap overflow