aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorMichael Niedermayer <michael@niedermayer.cc>2019-05-22 02:01:33 +0200
committerMichael Niedermayer <michael@niedermayer.cc>2019-06-05 13:19:59 +0200
commita99ffb5bb4454c625748972d9389cfaa5433a342 (patch)
tree172d10b35dc012d6ecec49b87ac388b1115b1fb2
parent0a2b768d3ecca32d496da1393406bebcab7680e2 (diff)
downloadffmpeg-a99ffb5bb4454c625748972d9389cfaa5433a342.tar.gz
avcodec/diracdec: Fix integer overflow in global_mv()
Fixes: signed integer overflow: 16384 * 196607 cannot be represented in type 'int' Fixes: 14810/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DIRAC_fuzzer-5091232683917312 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.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/libavcodec/diracdec.c b/libavcodec/diracdec.c
index 52a1951690..7b9e0099df 100644
--- a/libavcodec/diracdec.c
+++ b/libavcodec/diracdec.c
@@ -1433,8 +1433,8 @@ 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) + (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]);
+ 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]);
block->u.mv[ref][0] = (mx + (1<<(ez+ep))) >> (ez+ep);
block->u.mv[ref][1] = (my + (1<<(ez+ep))) >> (ez+ep);