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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-09-17 19:53:45 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-09-26 21:02:34 +0200 |
| commit | 87ddf9f1ef17726fd4235f2e7aed8334d0ff231b (patch) | |
| tree | 5771a9840aa9b637ab4c012600b83462c43ef6e0 | |
| parent | c5a52eb5cd5613cfede81648a58cd95088d0a3a7 (diff) | |
| download | ffmpeg-87ddf9f1ef17726fd4235f2e7aed8334d0ff231b.tar.gz | |
avcodec/4xm: Check index in decode_i_block() also in the path where its not used.
Fixes: Infinite loop
Fixes: signed integer overflow: 2147483644 + 16 cannot be represented in type 'int'
Fixes: 16169/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FOURXM_fuzzer-5662570416963584
Fixes: 16782/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FOURXM_fuzzer-5743163859271680
Fixes: 17641/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FOURXM_fuzzer-5711603562971136
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/4xm.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/libavcodec/4xm.c b/libavcodec/4xm.c index 1f4e2aee24..336c651d31 100644 --- a/libavcodec/4xm.c +++ b/libavcodec/4xm.c @@ -525,6 +525,10 @@ static int decode_i_block(FourXContext *f, int16_t *block) break; if (code == 0xf0) { i += 16; + if (i >= 64) { + av_log(f->avctx, AV_LOG_ERROR, "run %d overflow\n", i); + return 0; + } } else { if (code & 0xf) { level = get_xbits(&f->gb, code & 0xf); |