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avcodec/dpcm: clip exponent into supported range in XAN DPCM 

Fixes: shift exponent 32 is too large for 32-bit type 'int'
Fixes: 21200/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_XAN_DPCM_fuzzer-5754704894361600

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-04-09 15:37:55 +02:00
parent 995d937827
commit 20ade59d96
1 changed files with 2 additions and 3 deletions
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5
libavcodec/dpcm.c
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@ -321,9 +321,8 @@ static int dpcm_decode_frame(AVCodecContext *avctx, void *data,
shift[ch] -= (2 * n);
diff = sign_extend((diff &~ 3) << 8, 16);
/* saturate the shifter to a lower limit of 0 */
if (shift[ch] < 0)
shift[ch] = 0;
/* saturate the shifter to 0..31 */
shift[ch] = av_clip_uintp2(shift[ch], 5);
diff >>= shift[ch];
predictor[ch] += diff;