It seems the specification does not limit the value to 32bit
Fixes: signed integer overflow: -109611143 * 24 cannot be represented in type
'int'
Fixes:
13477/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DIRAC_fuzzer-5648337460527104
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
libavcodec/diracdec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/diracdec.c b/libavcodec/diracdec.c
index a1e759f656..a5bb6d5f34 100644
--- a/libavcodec/diracdec.c
+++ b/libavcodec/diracdec.c
@@ -1432,7 +1432,7 @@ static void global_mv(DiracContext *s, DiracBlock *block,
int x, int y, int ref)
int *b = s->globalmc[ref].pan_tilt;
int *c = s->globalmc[ref].perspective;
- int m = (1<<ep) - (c[0]*x + c[1]*y);
+ 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]);
--
2.21.0
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
To unsubscribe, visit link above, or email
ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
