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| author | Michael Niedermayer <michael@niedermayer.cc> | 2022-09-17 21:30:55 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2022-09-26 16:51:00 +0200 |
| commit | bf9ac33cffd8182700812052b7c1953e07fdcecb (patch) | |
| tree | ed87b1f46dac4d1b2beec1fd6804af994af7f9b2 | |
| parent | 080c074c254a9687b787488a39c257b15a1d923c (diff) | |
| download | ffmpeg-bf9ac33cffd8182700812052b7c1953e07fdcecb.tar.gz | |
avformat/asfdec_o: Limit packet offset
avoids overflows with it
Fixes: signed integer overflow: 9223372036846866010 + 4294967047 cannot be represented in type 'long'
Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_ASF_O_fuzzer-6538296768987136
Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_ASF_O_fuzzer-657169555665715
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 736e9e69d5dbbe1d81885dfef59917eb915d2f96)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/asfdec_o.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/libavformat/asfdec_o.c b/libavformat/asfdec_o.c index 98c44538e6..a9fe31b3f2 100644 --- a/libavformat/asfdec_o.c +++ b/libavformat/asfdec_o.c @@ -1351,6 +1351,8 @@ static int asf_read_packet_header(AVFormatContext *s) unsigned char error_flags, len_flags, pay_flags; asf->packet_offset = avio_tell(pb); + if (asf->packet_offset > INT64_MAX/2) + asf->packet_offset = 0; error_flags = avio_r8(pb); // read Error Correction Flags if (error_flags & ASF_PACKET_FLAG_ERROR_CORRECTION_PRESENT) { if (!(error_flags & ASF_ERROR_CORRECTION_LENGTH_TYPE)) { |