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| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-12-19 00:00:40 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-09-10 16:04:26 +0200 |
| commit | 4b8666d20f38973ef32908d44f792153f1116ab2 (patch) | |
| tree | a5808d17c7c3e46eedcbbb4eb7624a4d70870edc | |
| parent | 70855e0e61080673f2f18a1e2acff643b8981e9a (diff) | |
| download | ffmpeg-4b8666d20f38973ef32908d44f792153f1116ab2.tar.gz | |
avformat/nutdec: Check timebase count against main header length
Fixes: Timeout (long -> 3ms)
Fixes: 28514/clusterfuzz-testcase-minimized-ffmpeg_dem_NUT_fuzzer-6078669009321984
Fixes: 30095/clusterfuzz-testcase-minimized-ffmpeg_dem_NUT_fuzzer-5074433016463360
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit c425198558826795d94af45eeb9d94e4436c9a0f)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/nutdec.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/libavformat/nutdec.c b/libavformat/nutdec.c index 430b023d0c..760876f96c 100644 --- a/libavformat/nutdec.c +++ b/libavformat/nutdec.c @@ -193,13 +193,13 @@ static int decode_main_header(NUTContext *nut) { AVFormatContext *s = nut->avf; AVIOContext *bc = s->pb; - uint64_t tmp, end; + uint64_t tmp, end, length; unsigned int stream_count; int i, j, count, ret; int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx; - end = get_packetheader(nut, bc, 1, MAIN_STARTCODE); - end += avio_tell(bc); + length = get_packetheader(nut, bc, 1, MAIN_STARTCODE); + end = length + avio_tell(bc); nut->version = ffio_read_varlen(bc); if (nut->version < NUT_MIN_VERSION || @@ -219,7 +219,7 @@ static int decode_main_header(NUTContext *nut) nut->max_distance = 65536; } - GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational)); + GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational) && tmp < length/2); nut->time_base = av_malloc_array(nut->time_base_count, sizeof(AVRational)); if (!nut->time_base) return AVERROR(ENOMEM); |