[PATCH 6.3 322/364] ksmbd: allocate one more byte for implied bcc[0]

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From: Chih-Yen Chang <cc85nod@xxxxxxxxx>

commit 443d61d1fa9faa60ef925513d83742902390100f upstream.

ksmbd_smb2_check_message allows client to return one byte more, so we
need to allocate additional memory in ksmbd_conn_handler_loop to avoid
out-of-bound access.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Chih-Yen Chang <cc85nod@xxxxxxxxx>
Acked-by: Namjae Jeon <linkinjeon@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/ksmbd/connection.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/ksmbd/connection.c
+++ b/fs/ksmbd/connection.c
@@ -351,7 +351,8 @@ int ksmbd_conn_handler_loop(void *p)
 			break;
 
 		/* 4 for rfc1002 length field */
-		size = pdu_size + 4;
+		/* 1 for implied bcc[0] */
+		size = pdu_size + 4 + 1;
 		conn->request_buf = kvmalloc(size, GFP_KERNEL);
 		if (!conn->request_buf)
 			break;





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