NFSv4: Fix a slot leak in nfs40_sequence_done

The check for whether or not we sent an RPC call in nfs40_sequence_done
is insufficient to decide whether or not we are holding a session slot,
and thus should not be used to decide when to free that slot.

This patch replaces the RPC_WAS_SENT() test with the correct test for
whether or not slot == NULL.

Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: stable@vger.kernel.org # 3.12+
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index ae00c3e..493e9cc 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -539,7 +539,7 @@ static int nfs40_sequence_done(struct rpc_task *task,
        struct nfs4_slot *slot = res->sr_slot;
        struct nfs4_slot_table *tbl;
 
-       if (!RPC_WAS_SENT(task))
+       if (slot == NULL)
                goto out;
 
        tbl = slot->table;