cifs: check for bytes_remaining going to zero in CIFS_SessSetup
commitb3f815365f0bf897ece5d2896cb0534a9b70d28c
authorJeff Layton <jlayton@redhat.com>
Wed, 27 Apr 2011 17:25:51 +0000 (27 13:25 -0400)
committerGreg Kroah-Hartman <gregkh@suse.de>
Mon, 23 May 2011 18:20:14 +0000 (23 11:20 -0700)
tree76631b3e293c2063ee4b7d19fa5d1e8bf9a0fef8
parent790b1f612de4635baeec28b32d672ab4fb381879
cifs: check for bytes_remaining going to zero in CIFS_SessSetup

commit fcda7f4578bbf9717444ca6da8a421d21489d078 upstream.

It's possible that when we go to decode the string area in the
SESSION_SETUP response, that bytes_remaining will be 0. Decrementing it at
that point will mean that it can go "negative" and wrap. Check for a
bytes_remaining value of 0, and don't try to decode the string area if
that's the case.

Reported-and-Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
fs/cifs/sess.c