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avcodec/alsdec: Check k from being outside what our implementation can handle 

The specification does not seem to list what the maximum valid
value is

Fixes: shift exponent 32 is too large for 32-bit type 'unsigned int'
Fixes: 16268/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5638164544225280

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-08-25 18:22:50 +02:00
parent f119273649
commit e125578994
1 changed files with 3 additions and 0 deletions
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3
libavcodec/alsdec.c
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@ -833,6 +833,9 @@ static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
k [sb] = s[sb] > b ? s[sb] - b : 0;
delta[sb] = 5 - s[sb] + k[sb];
if (k[sb] >= 32)
return AVERROR_INVALIDDATA;
ff_bgmc_decode(gb, sb_len, current_res,
delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status);