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avcodec/ralf: Fix integer overflows with the filter coefficient in decode_channel() 

Fixes: signed integer overflow: 1145975808 - -1146173210 cannot be represented in type 'int'
Fixes: 18616/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RALF_fuzzer-5121296757424128

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 2019-11-05 22:27:04 +01:00
parent bf9c4a1275
commit 721624c2f6
1 changed files with 2 additions and 2 deletions
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4
libavcodec/ralf.c
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@ -264,8 +264,8 @@ static int decode_channel(RALFContext *ctx, GetBitContext *gb, int ch,
t = get_vlc2(gb, vlc[cmode].table, vlc[cmode].bits, 2);
t = extend_code(gb, t, 21, add_bits);
if (!cmode)
coeff -= 12 << add_bits;
coeff = t - coeff;
coeff -= 12U << add_bits;
coeff = (unsigned)t - coeff;
ctx->filter[i] = coeff;
cmode = coeff >> add_bits;