If the guest sets the sglist size to a value >=2GB, megasas_handle_dcmd
will return MFI_STAT_MEMORY_NOT_AVAILABLE without freeing the memory.
Avoid this by returning only the status from map_dcmd, and loading
cmd->iov_size in the caller.
Reported-by: Li Qiang <liqiang6-s@360.cn>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 765a707000)
[BR: CVE-2017-5856 BSC#1023053]
Signed-off-by: Bruce Rogers <brogers@suse.com>
b8174ff4de