This allows writing empty slices Fixes: Assertion slice->data_bit_start >= 0 && slice->data_size > slice->data_bit_start / 8 failed at libavcodec/cbs_mpeg2.c:340 Fixes: 19280/clusterfuzz-testcase-minimized-ffmpeg_BSF_MPEG2_METADATA_fuzzer-5632206173372416
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> --- libavcodec/cbs_mpeg2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/cbs_mpeg2.c b/libavcodec/cbs_mpeg2.c index 13d871cc89..b5286537db 100644 --- a/libavcodec/cbs_mpeg2.c +++ b/libavcodec/cbs_mpeg2.c @@ -337,7 +337,7 @@ static int cbs_mpeg2_write_slice(CodedBitstreamContext *ctx, uint8_t *pos = slice->data + slice->data_bit_start / 8; av_assert0(slice->data_bit_start >= 0 && - slice->data_size > slice->data_bit_start / 8); + slice->data_size * 8LL >= slice->data_bit_start); if (slice->data_size * 8 + 8 > put_bits_left(pbc)) return AVERROR(ENOSPC); -- 2.23.0 _______________________________________________ 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".
