From 2ce670fc489b319afb0d80d47e9875bf9a829d3a Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Thu, 20 Feb 2020 19:56:39 +0100 Subject: [PATCH] avcodec/sonic: Fix several integer overflows Fixes: signed integer overflow: 2129689466 + 2129689466 cannot be represented in type 'int' Fixes: 20715/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SONIC_fuzzer-5155263109922816 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer (cherry picked from commit 75d520e33704447f1b29ac47fd9e40994a6bc659) Signed-off-by: Michael Niedermayer --- libavcodec/sonic.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/libavcodec/sonic.c b/libavcodec/sonic.c index c975774b04..b82c44344c 100644 --- a/libavcodec/sonic.c +++ b/libavcodec/sonic.c @@ -140,7 +140,8 @@ static inline av_flatten int get_symbol(RangeCoder *c, uint8_t *state, int is_si if(get_rac(c, state+0)) return 0; else{ - int i, e, a; + int i, e; + unsigned a; e= 0; while(get_rac(c, state+1 + FFMIN(e,9))){ //1..10 e++; @@ -474,7 +475,7 @@ static int predictor_calc_error(int *k, int *state, int order, int error) for (i = order-2; i >= 0; i--, k_ptr--, state_ptr--) { int k_value = *k_ptr, state_value = *state_ptr; - x -= shift_down(k_value * state_value, LATTICE_SHIFT); + x -= shift_down(k_value * (unsigned)state_value, LATTICE_SHIFT); state_ptr[1] = state_value + shift_down(k_value * (unsigned)x, LATTICE_SHIFT); } #else @@ -1044,7 +1045,7 @@ static int sonic_decode_frame(AVCodecContext *avctx, x += s->channels; } - s->int_samples[x] = predictor_calc_error(s->predictor_k, s->predictor_state[ch], s->num_taps, s->coded_samples[ch][i] * quant); + s->int_samples[x] = predictor_calc_error(s->predictor_k, s->predictor_state[ch], s->num_taps, s->coded_samples[ch][i] * (unsigned)quant); x += s->channels; }