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cifs: fix lease break oops in xfstest generic/098

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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@microsoft.com>
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Fixes: 59a556aebc ("SMB3: drop reference to cfile before sending oplock break")
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Steve French
2023-06-11 11:23:32 -05:00
parent 5e90aa21eb
commit c774e6779f
1 changed files with 6 additions and 2 deletions
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8
fs/smb/client/file.c
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@@ -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);