[PATCH AUTOSEL 6.1 07/16] smb3: missing null check in SMB2_change_notify

[Sasha Levin]

From: Steve French <stfrench@xxxxxxxxxxxxx>

[ 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@xxxxxxxxx>
Reported-by: Dan Carpenter <error27@xxxxxxxxx>
Closes: https://lore.kernel.org/all/202305251831.3V1gbbFs-lkp@xxxxxxxxx/
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/cifs/smb2pdu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 537e8679900b8..3ca593cdda76e 100644
--- 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);
 	}
 
-- 
2.39.2