From: Steve French <stfrench@xxxxxxxxxxxxx>
[ Upstream commit c774e6779f38bf36f0cce65e30793704bab4b0d7 ]
umount can race with lease break so need to check if
tcon->ses->server is still valid to send the lease
break response.
Reviewed-by: Bharath SM <bharathsm@xxxxxxxxxxxxx>
Reviewed-by: Shyam Prasad N <sprasad@xxxxxxxxxxxxx>
Fixes: 59a556aebc43 ("SMB3: drop reference to cfile before sending oplock break")
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/cifs/file.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index df88b8c04d03d..051283386e229 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -4942,9 +4942,13 @@ void cifs_oplock_break(struct work_struct *work)
* disconnected since oplock already released by the server
*/
if (!oplock_break_cancelled) {
- rc = tcon->ses->server->ops->oplock_response(tcon, persistent_fid,
+ /* check for server null since can race with kill_sb calling tree disconnect */
+ if (tcon->ses && tcon->ses->server) {
+ rc = tcon->ses->server->ops->oplock_response(tcon, persistent_fid,
volatile_fid, net_fid, cinode);
- cifs_dbg(FYI, "Oplock release rc = %d\n", rc);
+ cifs_dbg(FYI, "Oplock release rc = %d\n", rc);
+ } else
+ pr_warn_once("lease break not sent for unmounted share\n");
}
cifs_done_oplock_break(cinode);
--
2.39.2
