RepoMirrors/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2025-02-08 15:50:18 +00:00
Code Issues Projects Releases Wiki Activity

avcodec/fic: Fix multiple left shift of negative value -15

Browse Source 
Fixes: 1356/clusterfuzz-testcase-minimized-6008489086287872

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-06 12:10:59 +02:00
parent c535436cbe
commit b20c71409b
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
libavcodec/fic.c
View File

@ -95,8 +95,8 @@ static av_always_inline void fic_idct(int16_t *blk, int step, int shift, int rnd
const int t7 = t3 - t1; const int t7 = t3 - t1;
const int t8 = 17734 * blk[2 * step] - 42813 * blk[6 * step]; const int t8 = 17734 * blk[2 * step] - 42813 * blk[6 * step];
const int t9 = 17734 * blk[6 * step] + 42814 * blk[2 * step]; const int t9 = 17734 * blk[6 * step] + 42814 * blk[2 * step];
const int tA = (blk[0 * step] - blk[4 * step] << 15) + rnd; const int tA = (blk[0 * step] - blk[4 * step]) * 32768 + rnd;
const int tB = (blk[0 * step] + blk[4 * step] << 15) + rnd; const int tB = (blk[0 * step] + blk[4 * step]) * 32768 + rnd;
blk[0 * step] = ( t4 + t9 + tB) >> shift; blk[0 * step] = ( t4 + t9 + tB) >> shift;
blk[1 * step] = ( t6 + t7 + t8 + tA) >> shift; blk[1 * step] = ( t6 + t7 + t8 + tA) >> shift;
blk[2 * step] = ( t6 - t7 - t8 + tA) >> shift; blk[2 * step] = ( t6 - t7 - t8 + tA) >> shift;