[FFmpeg-devel] [PATCH 3/3] avcodec/dirac_dwt_template: Fix Integer overflow in horizontal_compose_dd137i()

[Michael Niedermayer]

Fixes: 5894/clusterfuzz-testcase-minimized-5315325420634112
Fixes: runtime error: signed integer overflow: 2147483647 + 1 cannot be represented in type 'int'

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/dirac_dwt_template.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/dirac_dwt_template.c b/libavcodec/dirac_dwt_template.c
index e68cc4d530..19c008b988 100644
--- a/libavcodec/dirac_dwt_template.c
+++ b/libavcodec/dirac_dwt_template.c
@@ -118,8 +118,8 @@ static void RENAME(horizontal_compose_dd137i)(uint8_t *_b, uint8_t *_tmp, int w)
     tmp[w2+1] = tmp[w2] = tmp[w2-1];
 
     for (x = 0; x < w2; x++) {
-        b[2*x  ] = (tmp[x] + 1)>>1;
-        b[2*x+1] = (COMPOSE_DD97iH0(tmp[x-1], tmp[x], b[x+w2], tmp[x+1], tmp[x+2]) + 1)>>1;
+        b[2*x  ] = (tmp[x] + 1U)>>1;
+        b[2*x+1] = (COMPOSE_DD97iH0(tmp[x-1], tmp[x], b[x+w2], tmp[x+1], tmp[x+2]) + 1U)>>1;
     }
 }
 
-- 
2.16.1