smb3: add credits we receive from oplock/break PDUs

Otherwise we gradually leak credits leading to potential hung session. Signed-off-by: Ronnie Sahlberg <[email protected]> CC: Stable <[email protected]> Reviewed-by: Pavel Shilovsky <[email protected]> Signed-off-by: Steve French <[email protected]>
tomthink · Jan 24, 2019 · 2e5700b · 2e5700b
1 parent 6a9cbdd
commit 2e5700b
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c
@@ -648,6 +648,13 @@ smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
 	if (rsp->sync_hdr.Command != SMB2_OPLOCK_BREAK)
 		return false;
 
+	if (rsp->sync_hdr.CreditRequest) {
+		spin_lock(&server->req_lock);
+		server->credits += le16_to_cpu(rsp->sync_hdr.CreditRequest);
+		spin_unlock(&server->req_lock);
+		wake_up(&server->request_q);
+	}
+
 	if (rsp->StructureSize !=
 				smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
 		if (le16_to_cpu(rsp->StructureSize) == 44)