[FFmpeg-devel] [PATCH] avcodec/fft_template: Fix multiple runtime error: signed integer overflow: -1943918714 - 1935113003 cannot be represented in type 'int'
Michael Niedermayer
michael at niedermayer.cc
Thu May 25 17:10:49 EEST 2017
Fixes: 1735/clusterfuzz-testcase-minimized-5350472347025408
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
libavcodec/fft_template.c | 50 +++++++++++++++++++++++------------------------
1 file changed, 25 insertions(+), 25 deletions(-)
diff --git a/libavcodec/fft_template.c b/libavcodec/fft_template.c
index 480557f49f..e3a37e5d69 100644
--- a/libavcodec/fft_template.c
+++ b/libavcodec/fft_template.c
@@ -249,7 +249,7 @@ static void fft_calc_c(FFTContext *s, FFTComplex *z) {
int nbits, i, n, num_transforms, offset, step;
int n4, n2, n34;
- FFTSample tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8;
+ SUINT tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8;
FFTComplex *tmpz;
const int fft_size = (1 << s->nbits);
int64_t accu;
@@ -260,14 +260,14 @@ static void fft_calc_c(FFTContext *s, FFTComplex *z) {
offset = ff_fft_offsets_lut[n] << 2;
tmpz = z + offset;
- tmp1 = tmpz[0].re + tmpz[1].re;
- tmp5 = tmpz[2].re + tmpz[3].re;
- tmp2 = tmpz[0].im + tmpz[1].im;
- tmp6 = tmpz[2].im + tmpz[3].im;
- tmp3 = tmpz[0].re - tmpz[1].re;
- tmp8 = tmpz[2].im - tmpz[3].im;
- tmp4 = tmpz[0].im - tmpz[1].im;
- tmp7 = tmpz[2].re - tmpz[3].re;
+ tmp1 = tmpz[0].re + (SUINT)tmpz[1].re;
+ tmp5 = tmpz[2].re + (SUINT)tmpz[3].re;
+ tmp2 = tmpz[0].im + (SUINT)tmpz[1].im;
+ tmp6 = tmpz[2].im + (SUINT)tmpz[3].im;
+ tmp3 = tmpz[0].re - (SUINT)tmpz[1].re;
+ tmp8 = tmpz[2].im - (SUINT)tmpz[3].im;
+ tmp4 = tmpz[0].im - (SUINT)tmpz[1].im;
+ tmp7 = tmpz[2].re - (SUINT)tmpz[3].re;
tmpz[0].re = tmp1 + tmp5;
tmpz[2].re = tmp1 - tmp5;
@@ -288,19 +288,19 @@ static void fft_calc_c(FFTContext *s, FFTComplex *z) {
offset = ff_fft_offsets_lut[n] << 3;
tmpz = z + offset;
- tmp1 = tmpz[4].re + tmpz[5].re;
- tmp3 = tmpz[6].re + tmpz[7].re;
- tmp2 = tmpz[4].im + tmpz[5].im;
- tmp4 = tmpz[6].im + tmpz[7].im;
+ tmp1 = tmpz[4].re + (SUINT)tmpz[5].re;
+ tmp3 = tmpz[6].re + (SUINT)tmpz[7].re;
+ tmp2 = tmpz[4].im + (SUINT)tmpz[5].im;
+ tmp4 = tmpz[6].im + (SUINT)tmpz[7].im;
tmp5 = tmp1 + tmp3;
tmp7 = tmp1 - tmp3;
tmp6 = tmp2 + tmp4;
tmp8 = tmp2 - tmp4;
- tmp1 = tmpz[4].re - tmpz[5].re;
- tmp2 = tmpz[4].im - tmpz[5].im;
- tmp3 = tmpz[6].re - tmpz[7].re;
- tmp4 = tmpz[6].im - tmpz[7].im;
+ tmp1 = tmpz[4].re - (SUINT)tmpz[5].re;
+ tmp2 = tmpz[4].im - (SUINT)tmpz[5].im;
+ tmp3 = tmpz[6].re - (SUINT)tmpz[7].re;
+ tmp4 = tmpz[6].im - (SUINT)tmpz[7].im;
tmpz[4].re = tmpz[0].re - tmp5;
tmpz[0].re = tmpz[0].re + tmp5;
@@ -311,13 +311,13 @@ static void fft_calc_c(FFTContext *s, FFTComplex *z) {
tmpz[6].im = tmpz[2].im + tmp7;
tmpz[2].im = tmpz[2].im - tmp7;
- accu = (int64_t)Q31(M_SQRT1_2)*(tmp1 + tmp2);
+ accu = (int64_t)Q31(M_SQRT1_2)*(int)(tmp1 + tmp2);
tmp5 = (int32_t)((accu + 0x40000000) >> 31);
- accu = (int64_t)Q31(M_SQRT1_2)*(tmp3 - tmp4);
+ accu = (int64_t)Q31(M_SQRT1_2)*(int)(tmp3 - tmp4);
tmp7 = (int32_t)((accu + 0x40000000) >> 31);
- accu = (int64_t)Q31(M_SQRT1_2)*(tmp2 - tmp1);
+ accu = (int64_t)Q31(M_SQRT1_2)*(int)(tmp2 - tmp1);
tmp6 = (int32_t)((accu + 0x40000000) >> 31);
- accu = (int64_t)Q31(M_SQRT1_2)*(tmp3 + tmp4);
+ accu = (int64_t)Q31(M_SQRT1_2)*(int)(tmp3 + tmp4);
tmp8 = (int32_t)((accu + 0x40000000) >> 31);
tmp1 = tmp5 + tmp7;
tmp3 = tmp5 - tmp7;
@@ -348,10 +348,10 @@ static void fft_calc_c(FFTContext *s, FFTComplex *z) {
offset = ff_fft_offsets_lut[n] << nbits;
tmpz = z + offset;
- tmp5 = tmpz[ n2].re + tmpz[n34].re;
- tmp1 = tmpz[ n2].re - tmpz[n34].re;
- tmp6 = tmpz[ n2].im + tmpz[n34].im;
- tmp2 = tmpz[ n2].im - tmpz[n34].im;
+ tmp5 = tmpz[ n2].re + (SUINT)tmpz[n34].re;
+ tmp1 = tmpz[ n2].re - (SUINT)tmpz[n34].re;
+ tmp6 = tmpz[ n2].im + (SUINT)tmpz[n34].im;
+ tmp2 = tmpz[ n2].im - (SUINT)tmpz[n34].im;
tmpz[ n2].re = tmpz[ 0].re - tmp5;
tmpz[ 0].re = tmpz[ 0].re + tmp5;
--
2.13.0
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