From b2d9790c2ba75b5e5ac5194042f4175cb66cc0e0 Mon Sep 17 00:00:00 2001
From: Marton Balint <cus@passwd.hu>
Date: Sun, 20 Oct 2013 18:24:55 +0200
Subject: [PATCH] lavc: make avcodec_decode_subtitle2 more robust

Signed-off-by: Marton Balint <cus@passwd.hu>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavcodec/utils.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 162d61d468..37d6ee3a64 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -2338,6 +2338,12 @@ int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
 {
     int i, ret = 0;
 
+    if (!avpkt->data && avpkt->size) {
+        av_log(avctx, AV_LOG_ERROR, "invalid packet: NULL data, size != 0\n");
+        return AVERROR(EINVAL);
+    }
+    if (!avctx->codec)
+        return AVERROR(EINVAL);
     if (avctx->codec->type != AVMEDIA_TYPE_SUBTITLE) {
         av_log(avctx, AV_LOG_ERROR, "Invalid media type for subtitles\n");
         return AVERROR(EINVAL);