smb3: missing null check in SMB2_change_notify

[ Upstream commit b535cc796a4b4942cd189652588e8d37c1f5925a ]

If plen is null when passed in, we only checked for null
in one of the two places where it could be used. Although
plen is always valid (not null) for current callers of the
SMB2_change_notify function, this change makes it more consistent.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Closes: https://lore.kernel.org/all/202305251831.3V1gbbFs-lkp@intel.com/
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 537e867..3ca593c 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -3779,7 +3779,7 @@ SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
                if (*out_data == NULL) {
                        rc = -ENOMEM;
                        goto cnotify_exit;
-               } else
+               } else if (plen)
                        *plen = le32_to_cpu(smb_rsp->OutputBufferLength);
        }