From 5937f0550304e39be64ce41cc936634f1db54e5d Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Wed, 21 Aug 2019 23:05:21 +0200 Subject: [PATCH] avformat/vividas: Check av_xiphlacing() return value before use Fixes: out of array access Fixes: 16277/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5696629440512000 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: Paul B Mahol Signed-off-by: Michael Niedermayer --- libavformat/vividas.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/libavformat/vividas.c b/libavformat/vividas.c index 0c33ca2da8..645e322b6e 100644 --- a/libavformat/vividas.c +++ b/libavformat/vividas.c @@ -392,8 +392,14 @@ static int track_header(VividasDemuxContext *viv, AVFormatContext *s, uint8_t * p = st->codecpar->extradata; p[0] = 2; - for (j = 0; j < num_data - 1; j++) - offset += av_xiphlacing(&p[offset], data_len[j]); + for (j = 0; j < num_data - 1; j++) { + unsigned delta = av_xiphlacing(&p[offset], data_len[j]); + if (delta > data_len[j]) { + av_free(pb); + return AVERROR_INVALIDDATA; + } + offset += delta; + } for (j = 0; j < num_data; j++) { int ret = avio_read(pb, &p[offset], data_len[j]);