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avcodec/dstdec: Fix integer overflow in read_table()

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Fixes: signed integer overflow: -16 * 134217879 cannot be represented in type 'int'
Fixes: 20492/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DST_fuzzer-5639509530378240

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 2d465a401d)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2020-02-09 00:23:14 +01:00
parent 5191ef4402
commit 595565aeba
1 changed files with 1 additions and 1 deletions
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libavcodec/dstdec.c
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@@ -155,7 +155,7 @@ static int read_table(GetBitContext *gb, Table *t, const int8_t code_pred_coeff[
for (j = method + 1; j < t->length[i]; j++) { for (j = method + 1; j < t->length[i]; j++) {
int c, x = 0; int c, x = 0;
for (k = 0; k < method + 1; k++) for (k = 0; k < method + 1; k++)
x += code_pred_coeff[method][k] * t->coeff[i][j - k - 1]; x += code_pred_coeff[method][k] * (unsigned)t->coeff[i][j - k - 1];
c = get_sr_golomb_dst(gb, lsb_size); c = get_sr_golomb_dst(gb, lsb_size);
if (x >= 0) if (x >= 0)
c -= (x + 4) / 8; c -= (x + 4) / 8;