[FFmpeg-devel] [PATCH 3/3] avcodec/alac: Check lpc_quant

[Michael Niedermayer]

On Wed, Jun 19, 2019 at 01:53:03AM +0200, Michael Niedermayer wrote:
> lpc_quant of 0 produces undefined behavior, thus disallow this.
> If valid samples use this then such a sample would be quite
> usefull to confirm the correct&lossles handling of this.
> 
> Fixes: libavcodec/alac.c:218:25: runtime error: shift exponent -1 is negative
> Fixes: 15273/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-5656388535058432
> Fixes: 15276/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-5761238417539072
> Fixes: 15315/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-5767260766994432
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> ---
>  libavcodec/alac.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

will apply

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Opposition brings concord. Out of discord comes the fairest harmony.
-- Heraclitus
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