From 27b11428b7de097c42f205beabb1764f4365443b Mon Sep 17 00:00:00 2001 From: "J. Bruce Fields" Date: Thu, 8 May 2014 11:19:41 -0400 Subject: [PATCH] nfsd4: warn on finding lockowner without stateid's The current code assumes a one-to-one lockowner<->lock stateid correspondance. Cc: stable@vger.kernel.org Signed-off-by: J. Bruce Fields --- fs/nfsd/nfs4state.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 89e42409b237..9a77a5a21557 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -4166,6 +4166,10 @@ static bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, c if (!same_owner_str(&lo->lo_owner, owner, clid)) return false; + if (list_empty(&lo->lo_owner.so_stateids)) { + WARN_ON_ONCE(1); + return false; + } lst = list_first_entry(&lo->lo_owner.so_stateids, struct nfs4_ol_stateid, st_perstateowner); return lst->st_file->fi_inode == inode; -- 2.20.1