Re: [FFmpeg-devel] [PATCH 1/2] lavfi/blockdetect: Fix possible div by 0

["Thilo Borgmann" <thilo.borgmann@mail.de>]

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Now with actual patch…

-Thilo

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From 25e875c330e76c2c6be30231e9730fa3a2f30115 Mon Sep 17 00:00:00 2001
From: Thilo Borgmann <thilo.borgmann@mail.de>
Date: Sat, 4 Jun 2022 13:45:30 +0200
Subject: [PATCH 1/2] lavfi/blockdetect: Fix possible div by 0

Found-by Covererity, CID 1504568, 1504569
---
 libavfilter/vf_blockdetect.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavfilter/vf_blockdetect.c b/libavfilter/vf_blockdetect.c
index 8503b8d..85fca68 100644
--- a/libavfilter/vf_blockdetect.c
+++ b/libavfilter/vf_blockdetect.c
@@ -132,8 +132,10 @@ static float calculate_blockiness(BLKContext *s, int w, int h,
                 nonblock_count++;
             }
         }
+        if (block_count && nonblock_count) {
         temp = (block / block_count) / (nonblock / nonblock_count);
         ret = FFMAX(ret, temp);
+        }
     }
 
     // vertical blockiness (fixed height)
@@ -175,8 +177,10 @@ static float calculate_blockiness(BLKContext *s, int w, int h,
                 nonblock_count++;
             }
         }
+        if (block_count && nonblock_count) {
         temp = (block / block_count) / (nonblock / nonblock_count);
         ret = FFMAX(ret, temp);
+        }
     }
 
     // return highest value of horz||vert
-- 
1.8.3.2


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