cifs: cope with negative dentries in cifs_get_root
authorJeff Layton <jlayton@redhat.com>
Fri, 5 Aug 2011 13:02:40 +0000 (09:02 -0400)
committerSteve French <sfrench@us.ibm.com>
Fri, 5 Aug 2011 15:03:09 +0000 (15:03 +0000)
commit80975d21aae2136ccae1ce914a1602dc1d8b0795
treee2c5d8b441d3ff206c9dc671ade8f3d7c453e2d2
parentf9e8c45002cacad536b338dfa9e910e341a49c31
cifs: cope with negative dentries in cifs_get_root

The loop around lookup_one_len doesn't handle the case where it might
return a negative dentry, which can cause an oops on the next pass
through the loop. Check for that and break out of the loop with an
error of -ENOENT if there is one.

Fixes the panic reported here:

    https://bugzilla.redhat.com/show_bug.cgi?id=727927

Reported-by: TR Bentley <home@trarbentley.net>
Reported-by: Iain Arnell <iarnell@gmail.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: stable@kernel.org
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
fs/cifs/cifsfs.c