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authorMichael Niedermayer <michael@niedermayer.cc>2022-03-21 20:51:47 +0100
committerMichael Niedermayer <michael@niedermayer.cc>2022-04-09 22:19:41 +0200
commitc8ca479572d3dc710f2b1d5dcc12bb2ec6f798e7 (patch)
treed341ad8ac838c87998e3f3845114324744b11d85 /libavcodec/diracdec.c
parent61f4c4fc4265a170e9b789fe2e7e0acf11396129 (diff)
downloadffmpeg-c8ca479572d3dc710f2b1d5dcc12bb2ec6f798e7.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>
Diffstat (limited to 'libavcodec/diracdec.c')
-rw-r--r--libavcodec/diracdec.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/libavcodec/diracdec.c b/libavcodec/diracdec.c
index e80d4d1989..008e4d2e56 100644
--- a/libavcodec/diracdec.c
+++ b/libavcodec/diracdec.c
@@ -1430,8 +1430,8 @@ 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);