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avformat/hnm: check chunk_size == 0 

Fixes potential infinite loop

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-11-22 23:44:57 +01:00
parent bd8d28e2d2
commit 5c4aa72b75
1 changed files with 1 additions and 1 deletions
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2
libavformat/hnm.c
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@ -148,7 +148,7 @@ static int hnm_read_packet(AVFormatContext *s, AVPacket *pkt)
chunk_id = avio_rl16(pb);
avio_skip(pb, 2);
if (chunk_size > hnm->superchunk_remaining) {
if (chunk_size > hnm->superchunk_remaining || !chunk_size) {
av_log(s, AV_LOG_ERROR, "invalid chunk size: %u, offset: %u\n",
chunk_size, (int) avio_tell(pb));
avio_skip(pb, hnm->superchunk_remaining - 8);