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avcodec/apedec: Fix undefined integer overflow in decode_array_0000()

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Fixes: signed integer overflow: -2143289344 - 6246400 cannot be represented in type 'int'
Fixes: 19239/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5173755680915456

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit a3655bb02c21e70573335e9396632f64b2589536)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-12-07 20:55:16 +01:00
parent b7c2f4d298
commit 109cab1487
1 changed files with 1 additions and 1 deletions
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libavcodec/apedec.c
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@ -610,7 +610,7 @@ static void decode_array_0000(APEContext *ctx, GetBitContext *gb,
ksummin = rice->k ? (1 << rice->k + 6) : 0;
for (; i < blockstodecode; i++) {
out[i] = get_rice_ook(&ctx->gb, rice->k);
rice->ksum += out[i] - out[i - 64];
rice->ksum += out[i] - (unsigned)out[i - 64];
while (rice->ksum < ksummin) {
rice->k--;
ksummin = rice->k ? ksummin >> 1 : 0;