@@ -389,7 +389,7 @@ static int decode_subframe_lpc(ShortenContext *s, int command, int channel,
for (i = 0; i < s->blocksize; i++) {
sum = init_sum;
for (j = 0; j < pred_order; j++)
- sum += coeffs[j] * s->decoded[channel][i - j - 1];
+ sum += coeffs[j] * (unsigned)s->decoded[channel][i - j - 1];
s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) +
(sum >> qshift);
}
@@ -700,7 +700,7 @@ static int shorten_decode_frame(AVCodecContext *avctx, void *data,
/* update means with info from the current block */
if (s->nmean > 0) {
- int32_t sum = (s->version < 2) ? 0 : s->blocksize / 2;
+ int64_t sum = (s->version < 2) ? 0 : s->blocksize / 2;
for (i = 0; i < s->blocksize; i++)
sum += s->decoded[channel][i];
Fixes: signed integer overflow: 3 * 1006632960 cannot be represented in type 'int' Fixes: 8278/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SHORTEN_fuzzer-5692857166856192 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc> --- libavcodec/shorten.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)