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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>
This commit is contained in:
Michael Niedermayer 2019-09-17 19:53:45 +02:00
parent c5a52eb5cd
commit 87ddf9f1ef
1 changed files with 4 additions and 0 deletions
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4
libavcodec/4xm.c
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@ -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);