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[4.19,30/81] ceph: fix double unlock in handle_cap_export()

Message ID 20200526183930.831806653@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH May 26, 2020, 6:53 p.m. UTC 
From: Wu Bo <wubo40@huawei.com>

[ Upstream commit 4d8e28ff3106b093d98bfd2eceb9b430c70a8758 ]

If the ceph_mdsc_open_export_target_session() return fails, it will
do a "goto retry", but the session mutex has already been unlocked.
Re-lock the mutex in that case to ensure that we don't unlock it
twice.

Signed-off-by: Wu Bo <wubo40@huawei.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ceph/caps.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 5241102b81a8..a2d4eed27f80 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -3632,6 +3632,7 @@  retry:
 		WARN_ON(1);
 		tsession = NULL;
 		target = -1;
+		mutex_lock(&session->s_mutex);
 	}
 	goto retry;