Merge "res_rtp_asterisk.c: Check RTP packet version earlier." into 13

res/res_rtp_asterisk.c

@@ -5070,6 +5070,11 @@ static struct ast_frame *ast_rtp_read(struct ast_rtp_instance *instance, int rtc
 		return &ast_null_frame;
 	}
 
+	/* If the version is not what we expected by this point then just drop the packet */
+	if (version != 2) {
+		return &ast_null_frame;
+	}
+
 	/* If strict RTP protection is enabled see if we need to learn the remote address or if we need to drop the packet */
 	if (rtp->strict_rtp_state == STRICT_RTP_LEARN) {
 		if (!ast_sockaddr_cmp(&rtp->strict_rtp_address, &addr)) {
@@ -5116,11 +5121,6 @@ static struct ast_frame *ast_rtp_read(struct ast_rtp_instance *instance, int rtc
 		}
 	}
 
-	/* If the version is not what we expected by this point then just drop the packet */
-	if (version != 2) {
-		return &ast_null_frame;
-	}
-
 	/* Pull out the various other fields we will need */
 	payloadtype = (seqno & 0x7f0000) >> 16;
 	padding = seqno & (1 << 29);