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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-11-05 22:27:04 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-11-25 00:07:07 +0100 |
| commit | 721624c2f67545989626ba4413f7b8dbd7dff678 (patch) | |
| tree | 3aee24ec7b63364ba2062151eee600832f7d0b1b | |
| parent | bf9c4a12750e593d753011166b066efce208d9e0 (diff) | |
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>
| -rw-r--r-- | libavcodec/ralf.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/libavcodec/ralf.c b/libavcodec/ralf.c index ca8817aa21..d8f1803086 100644 --- a/libavcodec/ralf.c +++ b/libavcodec/ralf.c @@ -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; |