From: Volker Lendecke <vl@samba.org>
Date: Fri, 12 Sep 2008 19:19:37 +0000 (+0200)
Subject: Add a paranoia check on incoming PDUs
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8b81b85200b7ca18cf81fdbbc3254d8578b35f43;p=thirdparty%2Fsamba.git

Add a paranoia check on incoming PDUs
---

diff --git a/source/libsmb/async_smb.c b/source/libsmb/async_smb.c
index eedc7d4481d..b4d93ff9685 100644
--- a/source/libsmb/async_smb.c
+++ b/source/libsmb/async_smb.c
@@ -759,6 +759,13 @@ static void handle_incoming_pdu(struct cli_state *cli)
 
 	}
 
+	if ((IVAL(pdu, 4) != 0x424d53ff) /* 0xFF"SMB" */
+	    && (IVAL(pdu, 4) != 0x424d45ff)) /* 0xFF"EMB" */ {
+		DEBUG(10, ("Got non-SMB PDU\n"));
+		status = NT_STATUS_INVALID_NETWORK_RESPONSE;
+		goto invalidate_requests;
+	}
+
 	/*
 	 * TODO: Handle oplock break requests
 	 */