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| author | Michael Niedermayer <michael@niedermayer.cc> | 2022-08-31 01:21:38 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2022-10-09 22:15:45 +0200 |
| commit | bf29c080b1e03d88fa617acaffc2f7c7a734093d (patch) | |
| tree | abe80b41fcf9a0af9c4af8d7cb0164077e787102 | |
| parent | 8f443328c05b694f79d7d3ec8f6fd9a9e4956419 (diff) | |
| download | ffmpeg-bf29c080b1e03d88fa617acaffc2f7c7a734093d.tar.gz | |
avformat/asfdec_o: limit recursion depth in asf_read_unknown()
The threshold of 5 is arbitrary, both smaller and larger should work fine
Fixes: Stack overflow
Fixes: 50603/clusterfuzz-testcase-minimized-ffmpeg_dem_ASF_O_fuzzer-6049302564175872
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 1f1a368169ef9d945dc4b4764f5c60ba9bbc9134)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/asfdec_o.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/libavformat/asfdec_o.c b/libavformat/asfdec_o.c index 40a24b15df..edd139ab9e 100644 --- a/libavformat/asfdec_o.c +++ b/libavformat/asfdec_o.c @@ -113,6 +113,7 @@ typedef struct ASFContext { int64_t data_offset; int64_t first_packet_offset; // packet offset int64_t unknown_offset; // for top level header objects or subobjects without specified behavior + int in_asf_read_unknown; // ASF file must not contain more than 128 streams according to the specification ASFStream *asf_st[ASF_MAX_STREAMS]; @@ -177,7 +178,7 @@ static int asf_read_unknown(AVFormatContext *s, const GUIDParseTable *g) uint64_t size = avio_rl64(pb); int ret; - if (size > INT64_MAX) + if (size > INT64_MAX || asf->in_asf_read_unknown > 5) return AVERROR_INVALIDDATA; if (asf->is_header) @@ -186,8 +187,11 @@ static int asf_read_unknown(AVFormatContext *s, const GUIDParseTable *g) if (!g->is_subobject) { if (!(ret = strcmp(g->name, "Header Extension"))) avio_skip(pb, 22); // skip reserved fields and Data Size - if ((ret = detect_unknown_subobject(s, asf->unknown_offset, - asf->unknown_size)) < 0) + asf->in_asf_read_unknown ++; + ret = detect_unknown_subobject(s, asf->unknown_offset, + asf->unknown_size); + asf->in_asf_read_unknown --; + if (ret < 0) return ret; } else { if (size < 24) { |