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avcodec/ralf: fix undefined shift 

Fixes: left shift of negative value -2
Fixes: 16145/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RALF_fuzzer-5146671058518016

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 2019-08-17 19:18:31 +02:00
parent 361b3c873e
commit 0ee886988e
1 changed files with 2 additions and 2 deletions
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4
libavcodec/ralf.c
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@ -300,8 +300,8 @@ static int decode_channel(RALFContext *ctx, GetBitContext *gb, int ch,
t = get_vlc2(gb, code_vlc->table, code_vlc->bits, 2);
code1 = t / range2;
code2 = t % range2;
dst[i] = extend_code(gb, code1, range, 0) << add_bits;
dst[i + 1] = extend_code(gb, code2, range, 0) << add_bits;
dst[i] = extend_code(gb, code1, range, 0) * (1 << add_bits);
dst[i + 1] = extend_code(gb, code2, range, 0) * (1 << add_bits);
if (add_bits) {
dst[i] |= get_bits(gb, add_bits);
dst[i + 1] |= get_bits(gb, add_bits);