This avoids overflow checks on additions with 32bit numbers Fixes: signed integer overflow: 9223372036854775806 + 2 cannot be represented in type 'long' Fixes: 44012/clusterfuzz-testcase-minimized-ffmpeg_dem_HLS_fuzzer-4747770734444544
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> --- libavformat/hls.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/libavformat/hls.c b/libavformat/hls.c index 8204f55df3..b736f093a9 100644 --- a/libavformat/hls.c +++ b/libavformat/hls.c @@ -837,10 +837,10 @@ static int parse_playlist(HLSContext *c, const char *url, if (ret < 0) goto fail; seq_no = strtoull(ptr, NULL, 10); - if (seq_no > INT64_MAX) { + if (seq_no > INT64_MAX/2) { av_log(c->ctx, AV_LOG_DEBUG, "MEDIA-SEQUENCE higher than " - "INT64_MAX, mask out the highest bit\n"); - seq_no &= INT64_MAX; + "INT64_MAX/2, mask out the highest bit\n"); + seq_no &= INT64_MAX/2; } pls->start_seq_no = seq_no; } else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) { -- 2.17.1 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
