Because the 'size_t' type is 4 bytes in 32-bit platform, which
is the same with 'int'. It's easy to make 'max_len' to zero when
integer overflow and then cause heap overflow if 'max_len' is zero.

Using uint_64 instead of size_t to avoid the integer overflow.

Cc: qemu-stable@nongnu.org
Reported-by: NLi Qiang <liqiang6-s@360.cn>
Signed-off-by: NGonglei <arei.gonglei@huawei.com>
Tested-by: NLi Qiang <liqiang6-s@360.cn>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
(cherry picked from commit a08aaff8)
Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>