upstream: don't attempt to decode a ridiculous number of

attributes; harmless because of bounds elsewhere, but better to be explicit

OpenBSD-Commit-ID: 1a34f4b6896155b80327d15dc7ccf294b538a9f2

Author: djmdjm

sftp-common.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: sftp-common.c,v 1.33 2022/09/19 10:41:58 djm Exp $ */
+/* $OpenBSD: sftp-common.c,v 1.34 2023/03/31 04:00:37 djm Exp $ */
 /*
  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
  * Copyright (c) 2001 Damien Miller.  All rights reserved.
@@ -137,6 +137,8 @@ decode_attrib(struct sshbuf *b, Attrib *a)
 
 		if ((r = sshbuf_get_u32(b, &count)) != 0)
 			return r;
+		if (count > 0x100000)
+			return SSH_ERR_INVALID_FORMAT;
 		for (i = 0; i < count; i++) {
 			if ((r = sshbuf_get_cstring(b, &type, NULL)) != 0 ||
 			    (r = sshbuf_get_string(b, &data, &dlen)) != 0)