diff options
| -rw-r--r-- | libavformat/matroskadec.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c index d7881d9c1d..5aa8a105dc 100644 --- a/libavformat/matroskadec.c +++ b/libavformat/matroskadec.c @@ -1197,6 +1197,18 @@ static int ebml_parse_elem(MatroskaDemuxContext *matroska, length, max_lengths[syntax->type], syntax->type); return AVERROR_INVALIDDATA; } + if (matroska->num_levels > 0) { + MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1]; + AVIOContext *pb = matroska->ctx->pb; + int64_t pos = avio_tell(pb); + if (level->length != (uint64_t) -1 && + (pos + length) > (level->start + level->length)) { + av_log(matroska->ctx, AV_LOG_ERROR, + "Invalid length 0x%"PRIx64" > 0x%"PRIx64" in parent\n", + length, level->start + level->length); + return AVERROR_INVALIDDATA; + } + } } switch (syntax->type) { |