From c746f92a8e03d5a062359fba836eba4b3530687e Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sat, 17 Jun 2017 15:06:21 +0200 Subject: [PATCH] avcodec/jpeg2000dsp: Reorder operations in ict_int() to avoid 2 integer overflows Fixes: runtime error: signed integer overflow: 58065 * 51981 cannot be represented in type 'int' Fixes: 2271/clusterfuzz-testcase-minimized-5778297776504832 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/jpeg2000dsp.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libavcodec/jpeg2000dsp.c b/libavcodec/jpeg2000dsp.c index d183cbb87d..c746aed924 100644 --- a/libavcodec/jpeg2000dsp.c +++ b/libavcodec/jpeg2000dsp.c @@ -64,10 +64,10 @@ static void ict_int(void *_src0, void *_src1, void *_src2, int csize) int i; for (i = 0; i < csize; i++) { - i0 = *src0 + (((i_ict_params[0] * *src2) + (1 << 15)) >> 16); + i0 = *src0 + *src2 + (((26345 * *src2) + (1 << 15)) >> 16); i1 = *src0 - (((i_ict_params[1] * *src1) + (1 << 15)) >> 16) - (((i_ict_params[2] * *src2) + (1 << 15)) >> 16); - i2 = *src0 + (((i_ict_params[3] * *src1) + (1 << 15)) >> 16); + i2 = *src0 + (2 * *src1) + (((-14942 * *src1) + (1 << 15)) >> 16); *src0++ = i0; *src1++ = i1; *src2++ = i2;