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Code Issues Releases Activity

avcodec/ralf: Skip initializing unused filter variables

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Fixes: left shift of negative value -1
Fixes: 17890/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RALF_fuzzer-5643307467669504

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 2019-10-05 19:34:17 +02:00
parent 42eb78059d
commit f4ecf6c39d
1 changed files with 4 additions and 2 deletions
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6
libavcodec/ralf.c
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@ -234,8 +234,10 @@ static int decode_channel(RALFContext *ctx, GetBitContext *gb, int ch,
int *dst = ctx->channel_data[ch];
ctx->filter_params = get_vlc2(gb, set->filter_params.table, 9, 2);
ctx->filter_bits = (ctx->filter_params - 2) >> 6;
ctx->filter_length = ctx->filter_params - (ctx->filter_bits << 6) - 1;
if (ctx->filter_params > 1) {
ctx->filter_bits = (ctx->filter_params - 2) >> 6;
ctx->filter_length = ctx->filter_params - (ctx->filter_bits << 6) - 1;
}
if (ctx->filter_params == FILTER_RAW) {
for (i = 0; i < length; i++)