From: Kevin P. Fleming <kpfleming@digium.com>
Date: Tue, 6 Jun 2006 15:38:44 +0000 (+0000)
Subject: correct yesterday's security fix so that it doesn't improperly reject valid video... 
X-Git-Tag: 1.0.11.1~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e132aba5c94ac78b028466f38cdb9747626f4f04;p=thirdparty%2Fasterisk.git

correct yesterday's security fix so that it doesn't improperly reject valid video frames


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.0@32565 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---

diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index d55734293b..a788234821 100644
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -5052,11 +5052,21 @@ static int socket_read(int *id, int fd, short events, void *cbdata)
 		ast_log(LOG_WARNING, "midget packet received (%d of %d min)\n", res, (int)sizeof(struct ast_iax2_mini_hdr));
 		return 1;
 	}
-	if ((res >= sizeof(*vh)) && ((vh->zeros == 0) && (ntohs(vh->callno) & 0x8000))) {
+	if ((vh->zeros == 0) && (ntohs(vh->callno) & 0x8000)) {
+		if (res < sizeof(*vh)) {
+			ast_log(LOG_WARNING, "Rejecting packet from '%s.%d' that is flagged as a mini video frame but is too short\n", ast_inet_ntoa(iabuf, sizeof(iabuf), sin.sin_addr), ntohs(sin.sin_port));
+			return 1;
+			
+		}
 		/* This is a video frame, get call number */
 		fr.callno = find_callno(ntohs(vh->callno) & ~0x8000, dcallno, &sin, new, 1);
 		minivid = 1;
-	} else if ((res >= sizeof(*meta)) && (meta->zeros == 0) && !(ntohs(meta->metacmd) & 0x8000)) {
+	} else if ((meta->zeros == 0) && !(ntohs(meta->metacmd) & 0x8000)) {
+		if (res < sizeof(*meta)) {
+			ast_log(LOG_WARNING, "Rejecting packet from '%s.%d' that is flagged as a meta frame but is too short\n", ast_inet_ntoa(iabuf, sizeof(iabuf), sin.sin_addr), ntohs(sin.sin_port));
+			return 1;
+			
+		}
 		/* This is a meta header */
 		switch(meta->metacmd) {
 		case IAX_META_TRUNK:
@@ -5149,14 +5159,7 @@ static int socket_read(int *id, int fd, short events, void *cbdata)
 		}
 		return 1;
 	}
-	/* if we got here and ->zeros contains zeros, this cannot be a valid
-	   miniframe or full frame but it wasn't a valid video frame or meta
-	   frame either, so we reject it
-	*/
-	if (vh->zeros == 0) {
-		ast_log(LOG_WARNING, "Rejecting packet from '%s.%d' that is flagged as a video or meta frame but is not properly formatted\n", ast_inet_ntoa(iabuf, sizeof(iabuf), sin.sin_addr), ntohs(sin.sin_port));
-		return 1;
-	}
+
 #ifdef DEBUG_SUPPORT
 	if (iaxdebug)
 		iax_showframe(NULL, fh, 1, &sin, res - sizeof(struct ast_iax2_full_hdr));