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avformat/asfdec_o: Check offset before adding index entry 

Fixes: signed integer overflow: 9223372036854550860 + 530259564 cannot be represented in type 'long'
Fixes: 49093/clusterfuzz-testcase-minimized-ffmpeg_dem_ASF_O_fuzzer-4697179192688640

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-10-05 21:46:42 +02:00
parent eb9153b4a7
commit 557aa7772e
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1 changed files with 2 additions and 0 deletions
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libavformat/asfdec_o.c
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@ -888,6 +888,8 @@ static int asf_read_simple_index(AVFormatContext *s, const GUIDParseTable *g)
av_log(s, AV_LOG_ERROR, "Skipping failed in asf_read_simple_index.\n"); av_log(s, AV_LOG_ERROR, "Skipping failed in asf_read_simple_index.\n");
return offset; return offset;
} }
if (asf->first_packet_offset > INT64_MAX - asf->packet_size * pkt_num)
return AVERROR_INVALIDDATA;
if (prev_pkt_num != pkt_num) { if (prev_pkt_num != pkt_num) {
av_add_index_entry(st, asf->first_packet_offset + asf->packet_size * av_add_index_entry(st, asf->first_packet_offset + asf->packet_size *
pkt_num, av_rescale(interval, i, 10000), pkt_num, av_rescale(interval, i, 10000),