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| author | Michael Niedermayer <michael@niedermayer.cc> | 2022-03-21 20:51:47 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2022-04-04 00:05:36 +0200 |
| commit | 1ed490b9dc5770df691dd741e57a9072afcc39c9 (patch) | |
| tree | c5e62f651900ddfc1a13c81f6206506faf15827b | |
| parent | 9cd9f958ebd54a7e7a349909e7f74556b7f121bd (diff) | |
| download | ffmpeg-1ed490b9dc5770df691dd741e57a9072afcc39c9.tar.gz | |
avcodec/diracdec: avoid signed integer overflow in global mv
Fixes: signed integer overflow: -128275513086 * -76056576 cannot be represented in type 'long'
Fixes: 45818/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DIRAC_fuzzer-5129799149944832
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 7f1279684e8e1e33c78577b7f0265c062e4e6232)
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 7ffb8a3496..1a7fa59dbd 100644 --- a/libavcodec/diracdec.c +++ b/libavcodec/diracdec.c @@ -1432,8 +1432,8 @@ static void global_mv(DiracContext *s, DiracBlock *block, int x, int y, int ref) int *c = s->globalmc[ref].perspective; int64_t m = (1<<ep) - (c[0]*(int64_t)x + c[1]*(int64_t)y); - int64_t mx = m * (int64_t)((A[0][0] * (int64_t)x + A[0][1]*(int64_t)y) + (1LL<<ez) * b[0]); - int64_t my = m * (int64_t)((A[1][0] * (int64_t)x + A[1][1]*(int64_t)y) + (1LL<<ez) * b[1]); + int64_t mx = m * (uint64_t)((A[0][0] * (int64_t)x + A[0][1]*(int64_t)y) + (1LL<<ez) * b[0]); + int64_t my = m * (uint64_t)((A[1][0] * (int64_t)x + A[1][1]*(int64_t)y) + (1LL<<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); |