RepoMirrors
/
ffmpeg
mirror of https://git.ffmpeg.org/ffmpeg.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

avcodec/diracdec: Use int64 in global mv to prevent overflow 

Fixes: runtime error: signed integer overflow: 361 * -6295541 cannot be represented in type 'int'
Fixes: 5911/clusterfuzz-testcase-minimized-6450382197751808

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 2018-02-17 23:54:44 +01:00
parent 3748746a4d
commit cbcbefdc3b
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/diracdec.c
View File

@ -1399,8 +1399,8 @@ static void global_mv(DiracContext *s, DiracBlock *block, int x, int y, int ref)
int *c = s->globalmc[ref].perspective;
int m = (1<<ep) - (c[0]*x + c[1]*y);
int mx = m * ((A[0][0] * x + A[0][1]*y) + (1<<ez) * b[0]);
int my = m * ((A[1][0] * x + A[1][1]*y) + (1<<ez) * b[1]);
int64_t mx = m * (int64_t)((A[0][0] * x + A[0][1]*y) + (1<<ez) * b[0]);
int64_t my = m * (int64_t)((A[1][0] * x + A[1][1]*y) + (1<<ez) * b[1]);
block->u.mv[ref][0] = (mx + (1<<(ez+ep))) >> (ez+ep);
block->u.mv[ref][1] = (my + (1<<(ez+ep))) >> (ez+ep);