From ef0a5051262e8fc237601a3def4bbdc9aa4195ac Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sat, 17 Sep 2022 21:48:43 +0200 Subject: [PATCH] avformat/cafdec: Check that nb_frasmes fits within 64bit Fixes: signed integer overflow: 1099511693312 * 538976288 cannot be represented in type 'long' Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_CAF_fuzzer-6565048815845376 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer (cherry picked from commit d4bb4e375975dc0d31d5309106cf6ee0ed75140f) Signed-off-by: Michael Niedermayer --- libavformat/cafdec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavformat/cafdec.c b/libavformat/cafdec.c index d5b8c38c25..e0a9031cb8 100644 --- a/libavformat/cafdec.c +++ b/libavformat/cafdec.c @@ -387,7 +387,7 @@ static int read_header(AVFormatContext *s) found_data: if (caf->bytes_per_packet > 0 && caf->frames_per_packet > 0) { - if (caf->data_size > 0) + if (caf->data_size > 0 && caf->data_size / caf->bytes_per_packet < INT64_MAX / caf->frames_per_packet) st->nb_frames = (caf->data_size / caf->bytes_per_packet) * caf->frames_per_packet; } else if (ffstream(st)->nb_index_entries && st->duration > 0) { if (st->codecpar->sample_rate && caf->data_size / st->duration > INT64_MAX / st->codecpar->sample_rate / 8) {