tree 1746c5eacc83d3074a4058b526b159a26a3c5f62
parent 70f62231cdfd52357836733dd31db787e0412ab2
author Jeff Layton <jlayton@kernel.org> 1673019228 -0500
committer Chuck Lever <chuck.lever@oracle.com> 1676902822 -0500

nfsd: fix potential race in nfs4_find_file

The WARN_ON_ONCE check is not terribly useful. It also seems possible
for nfs4_find_file to race with the destruction of an fi_deleg_file
while trying to take a reference to it.

Now that it's safe to pass nfs_get_file a NULL pointer, remove the WARN
and NULL pointer check. Take the fi_lock when fetching fi_deleg_file.

Cc: NeilBrown <neilb@suse.de>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>