tree ada73d6c52a6e9b37cbdc95d086485fdf338561a
parent 2c9c8f36c34e1defcaa7e4c298651998b47f5282
author J. Bruce Fields <bfields@redhat.com> 1299456663 -0500
committer J. Bruce Fields <bfields@redhat.com> 1299516293 -0500

nfsd4: fix bad pointer on failure to find delegation

In case of a nonempty list, the return on error here is obviously bogus;
it ends up being a pointer to the list head instead of to any valid
delegation on the list.

In particular, if nfsd4_delegreturn() hits this case, and you're quite unlucky,
then renew_client may oops, and it may take an embarassingly long time to
figure out why.  Facepalm.

BUG: unable to handle kernel NULL pointer dereference at 0000000000000090
IP: [<ffffffff81292965>] nfsd4_delegreturn+0x125/0x200
...

Cc: stable@kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>