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avformat/siff: Basic pkt_size check 

Fixes: half of CID1258461 Overflowed constant

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 124a97dd8b)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-07-11 20:58:21 +02:00
parent fd8b766daf
commit cedd68972d
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GPG Key ID: B18E8928B3948D64
1 changed files with 4 additions and 1 deletions
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5
libavformat/siff.c
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@ -198,7 +198,10 @@ static int siff_read_packet(AVFormatContext *s, AVPacket *pkt)
if (c->cur_frame >= c->frames) if (c->cur_frame >= c->frames)
return AVERROR_EOF; return AVERROR_EOF;
if (c->curstrm == -1) { if (c->curstrm == -1) {
c->pktsize = avio_rl32(s->pb) - 4; unsigned pktsize = avio_rl32(s->pb);
if (pktsize < 4)
return AVERROR_INVALIDDATA;
c->pktsize = pktsize - 4;
c->flags = avio_rl16(s->pb); c->flags = avio_rl16(s->pb);
if (c->flags & VB_HAS_AUDIO && !c->has_audio) if (c->flags & VB_HAS_AUDIO && !c->has_audio)
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;