ksmbd: add the check to vaildate if stream protocol length exceeds maximum value
This patch add MAX_STREAM_PROT_LEN macro and check if stream protocol
length exceeds maximum value. opencode pdu size check in
ksmbd_pdu_size_has_room().
Cc: Tom Talpey <tom@talpey.com>
Cc: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Cc: Ralph Böhme <slow@samba.org>
Acked-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
diff --git a/fs/ksmbd/connection.c b/fs/ksmbd/connection.c
index af086d3..48b18b4 100644
--- a/fs/ksmbd/connection.c
+++ b/fs/ksmbd/connection.c
@@ -296,10 +296,12 @@ int ksmbd_conn_handler_loop(void *p)
pdu_size = get_rfc1002_len(hdr_buf);
ksmbd_debug(CONN, "RFC1002 header %u bytes\n", pdu_size);
- /* make sure we have enough to get to SMB header end */
- if (!ksmbd_pdu_size_has_room(pdu_size)) {
- ksmbd_debug(CONN, "SMB request too short (%u bytes)\n",
- pdu_size);
+ /*
+ * Check if pdu size is valid (min : smb header size,
+ * max : 0x00FFFFFF).
+ */
+ if (pdu_size < __SMB2_HEADER_STRUCTURE_SIZE ||
+ pdu_size > MAX_STREAM_PROT_LEN) {
continue;
}
