From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
commit d180891fba995bd54e25b089b1ec98d134873586 upstream.
Some calls to rpc_exit_task() may deliberately change the value of
task->tk_status, for instance because it gets checked by the RPC call's
rpc_release() callback. That makes it wrong to reset the value to
task->tk_rpc_status.
In particular this causes a bug where the rpc_call_done() callback tries
to fail over a set of pNFS/flexfiles writes to a different IP address,
but the reset of task->tk_status causes nfs_commit_release_pages() to
immediately mark the file as having a fatal error.
Fixes: 39494194f93b ("SUNRPC: Fix races with rpc_killall_tasks()")
Cc: stable@xxxxxxxxxxxxxxx # 6.1.x
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/sunrpc/sched.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -927,11 +927,10 @@ static void __rpc_execute(struct rpc_tas
*/
do_action = task->tk_action;
/* Tasks with an RPC error status should exit */
- if (do_action != rpc_exit_task &&
+ if (do_action && do_action != rpc_exit_task &&
(status = READ_ONCE(task->tk_rpc_status)) != 0) {
task->tk_status = status;
- if (do_action != NULL)
- do_action = rpc_exit_task;
+ do_action = rpc_exit_task;
}
/* Callbacks override all actions */
if (task->tk_callback) {
