[FFmpeg-devel] [PATCH] avcodec/jpeg2000dwt: Fix integer overflow in dwt_decode97_int()

[Michael Niedermayer]

Fixes: runtime error: signed integer overflow: 2147483598 + 128 cannot be represented in type 'int'
Fixes: 12926/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-5705100733972480

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/jpeg2000dwt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/jpeg2000dwt.c b/libavcodec/jpeg2000dwt.c
index ce1678a3d7..badf0f8cd0 100644
--- a/libavcodec/jpeg2000dwt.c
+++ b/libavcodec/jpeg2000dwt.c
@@ -531,7 +531,7 @@ static void dwt_decode97_int(DWTContext *s, int32_t *t)
     }
 
     for (i = 0; i < w * h; i++)
-        data[i] = (data[i] + ((1<<I_PRESHIFT)>>1)) >> I_PRESHIFT;
+        data[i] = (data[i] + ((1LL<<I_PRESHIFT)>>1)) >> I_PRESHIFT;
 }
 
 int ff_jpeg2000_dwt_init(DWTContext *s, int border[2][2],
-- 
2.20.1