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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>