6.12-stable review patch. If anyone has any objections, please let me know.
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From: Namjae Jeon linkinjeon@kernel.org
[ Upstream commit ddb7ea36ba7129c2ed107e2186591128618864e1 ]
r_count is only increased when there is an oplock break wait, so r_count inc/decrement are not paired. This can cause r_count to become negative, which can lead to a problem where the ksmbd thread does not terminate.
Fixes: 3aa660c05924 ("ksmbd: prevent connection release during oplock break notification") Reported-by: Norbert Szetei norbert@doyensec.com Tested-by: Norbert Szetei norbert@doyensec.com Signed-off-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/smb/server/oplock.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/smb/server/oplock.c b/fs/smb/server/oplock.c index 592fe665973a8..304aefecaaaf5 100644 --- a/fs/smb/server/oplock.c +++ b/fs/smb/server/oplock.c @@ -724,8 +724,8 @@ static int smb2_oplock_break_noti(struct oplock_info *opinfo) work->conn = conn; work->sess = opinfo->sess;
+ ksmbd_conn_r_count_inc(conn); if (opinfo->op_state == OPLOCK_ACK_WAIT) { - ksmbd_conn_r_count_inc(conn); INIT_WORK(&work->work, __smb2_oplock_break_noti); ksmbd_queue_work(work);
@@ -833,8 +833,8 @@ static int smb2_lease_break_noti(struct oplock_info *opinfo) work->conn = conn; work->sess = opinfo->sess;
+ ksmbd_conn_r_count_inc(conn); if (opinfo->op_state == OPLOCK_ACK_WAIT) { - ksmbd_conn_r_count_inc(conn); INIT_WORK(&work->work, __smb2_lease_break_noti); ksmbd_queue_work(work); wait_for_break_ack(opinfo);