cifs: fix possible memory corruption in CIFSFindNext, CVE-2011-3191

cifs: fix possible memory corruption in CIFSFindNext, CVE-2011-3191

The name_len variable in CIFSFindNext is a signed int that gets set to
the resume_name_len in the cifs_search_info. The resume_name_len however
is unsigned and for some infolevels is populated directly from a 32 bit
value sent by the server.

If the server sends a very large value for this, then that value could
look negative when converted to a signed int. That would make that
value pass the PATH_MAX check later in CIFSFindNext. The name_len would
then be used as a length value for a memcpy. It would then be treated
as unsigned again, and the memcpy scribbles over a ton of memory.

Fix this by making the name_len an unsigned value in CIFSFindNext.

Cc: <stable@kernel.org>
Reported-by: Darren Lavender <dcl@hppine99.gbr.hp.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>

(cherry-picked from commit c32dfffaf59f73bbcf4472141b851a4dc5db2bf0 cifs-2.6.git)
CVE-2011-3191
BugLink: http://bugs.launchpad.net/bugs/834135
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>