smb3: add additional null check in SMB2_open

Although unlikely to be possible for rsp to be null here,
the check is safer to add, and quiets a Coverity warning.

Addresses-Coverity: 1418458 ("Explicit null dereferenced")
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 4dda260..48679e0 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2941,7 +2941,9 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
                        tcon->need_reconnect = true;
                }
                goto creat_exit;
-       } else
+       } else if (rsp == NULL) /* unlikely to happen, but safer to check */
+               goto creat_exit;
+       else
                trace_smb3_open_done(xid, le64_to_cpu(rsp->PersistentFileId),
                                     tcon->tid,
                                     ses->Suid, oparms->create_options,