X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fmpeg4videodec.c;h=1e22165c0ba3dae953db1d8b6cce69d9bb71cb69;hb=eb5049227033d946add93c0714bb8a28d94166f1;hp=54b7be10ddb56ddaa0e4564632f19f8d79a6eb06;hpb=545d14f06733e2aa192e39175c90f62470c75cfb;p=ffmpeg

diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c
index 54b7be10ddb..1e22165c0ba 100644
--- a/libavcodec/mpeg4videodec.c
+++ b/libavcodec/mpeg4videodec.c
@@ -2566,6 +2566,7 @@ int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
     MpegEncContext *s = &ctx->m;
     unsigned startcode, v;
     int ret;
+    int vol = 0;
 
     /* search next start code */
     align_get_bits(gb);
@@ -2654,6 +2655,11 @@ int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
         }
 
         if (startcode >= 0x120 && startcode <= 0x12F) {
+            if (vol) {
+                av_log(s->avctx, AV_LOG_ERROR, "Multiple VOL headers");
+                return AVERROR_INVALIDDATA;
+            }
+            vol++;
             if ((ret = decode_vol_header(ctx, gb)) < 0)
                 return ret;
         } else if (startcode == USER_DATA_STARTCODE) {