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| author | Michael Niedermayer <michael@niedermayer.cc> | 2018-07-22 18:58:34 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-07-28 14:35:50 +0200 |
| commit | 51290406461ed40b70e0e05b389a461a283f3367 (patch) | |
| tree | 750fabe234e354e6dbcabe7b39a5abe6948422d7 | |
| parent | ed647ab79f9a54d8d3a8e345f6a1643b60b849f4 (diff) | |
| download | ffmpeg-51290406461ed40b70e0e05b389a461a283f3367.tar.gz | |
avcodec/diracdec: Prevent integer overflow in intermediate in global_mv()
Fixes: signed integer overflow: -393471 * 5460 cannot be represented in type 'int'
Fixes: 8890/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DIRAC_fuzzer-6299775379963904
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/diracdec.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/libavcodec/diracdec.c b/libavcodec/diracdec.c index 753adeff61..e4cdd7ee2c 100644 --- a/libavcodec/diracdec.c +++ b/libavcodec/diracdec.c @@ -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); - 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]); + int64_t mx = m * (int64_t)((A[0][0] * (int64_t)x + A[0][1]*(int64_t)y) + (1<<ez) * b[0]); + int64_t my = m * (int64_t)((A[1][0] * (int64_t)x + A[1][1]*(int64_t)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); |