flv: Validate the packet size
authorLuca Barbato <lu_zero@gentoo.org>
Mon, 17 Apr 2017 14:10:52 +0000 (14:10 +0000)
committerLuca Barbato <lu_zero@gentoo.org>
Thu, 20 Apr 2017 15:39:18 +0000 (15:39 +0000)
Size can be negative at that point.

Bug-Id: 1041
CC: libav-stable@libav.org
libavformat/flvdec.c

index 693c859..1b29740 100644 (file)
@@ -912,6 +912,12 @@ skip:
         st->codecpar->codec_id == AV_CODEC_ID_H264) {
         int type = avio_r8(s->pb);
         size--;
+
+        if (size < 0) {
+            ret = AVERROR_INVALIDDATA;
+            goto leave;
+        }
+
         if (st->codecpar->codec_id == AV_CODEC_ID_H264) {
             // sign extension
             int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;