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avcodec/sonic: Fix two undefined integer overflows 

Fixes: signed integer overflow: 2147483372 - -148624 cannot be represented in type 'int'
Fixes: 45982/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SONIC_fuzzer-5477177805373440
Fixes: 45982/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SONIC_fuzzer-6681622236233728

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 2023-04-16 17:19:10 +02:00
parent 34056a94ea
commit 2632e90493
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GPG Key ID: B18E8928B3948D64
1 changed files with 2 additions and 2 deletions
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libavcodec/sonic.c
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@ -473,7 +473,7 @@ static void predictor_init_state(int *k, int *state, int order)
static int predictor_calc_error(int *k, int *state, int order, int error)
{
int i, x = error - shift_down(k[order-1] * (unsigned)state[order-1], LATTICE_SHIFT);
int i, x = error - (unsigned)shift_down(k[order-1] * (unsigned)state[order-1], LATTICE_SHIFT);
#if 1
int *k_ptr = &(k[order-2]),
@ -1013,7 +1013,7 @@ static int sonic_decode_frame(AVCodecContext *avctx, AVFrame *frame,
if (s->lossless)
quant = 1;
else
quant = get_symbol(&c, state, 0) * SAMPLE_FACTOR;
quant = get_symbol(&c, state, 0) * (unsigned)SAMPLE_FACTOR;
// av_log(NULL, AV_LOG_INFO, "quant: %d\n", quant);