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flv: Validate the packet size

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Size can be negative at that point.

Bug-Id: 1041
CC: libav-stable@libav.org
This commit is contained in:
Luca Barbato 2017-04-17 14:10:52 +00:00
parent 4809781586
commit 279e3aaa14
1 changed files with 6 additions and 0 deletions
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6
libavformat/flvdec.c
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@ -912,6 +912,12 @@ skip:
st->codecpar->codec_id == AV_CODEC_ID_H264) { st->codecpar->codec_id == AV_CODEC_ID_H264) {
int type = avio_r8(s->pb); int type = avio_r8(s->pb);
size--; size--;
if (size < 0) {
ret = AVERROR_INVALIDDATA;
goto leave;
}
if (st->codecpar->codec_id == AV_CODEC_ID_H264) { if (st->codecpar->codec_id == AV_CODEC_ID_H264) {
// sign extension // sign extension
int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000; int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;