PR #20132 opened by Niklas Haas (haasn)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20132
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20132.patch
This histogram index was not correctly downshifted to 8-bit.
>From 651ce7dbc9cb88ab01002867ddb5b44a6f17a647 Mon Sep 17 00:00:00 2001
From: Niklas Haas <g...@haasn.dev>
Date: Wed, 6 Aug 2025 12:11:59 +0200
Subject: [PATCH] avfilter/vf_thumbnail: fix buffer overflow for odd sized HBD
inputs
This histogram index was not correctly downshifted to 8-bit.
---
libavfilter/vf_thumbnail.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavfilter/vf_thumbnail.c b/libavfilter/vf_thumbnail.c
index 8cda7b45f1..728880e100 100644
--- a/libavfilter/vf_thumbnail.c
+++ b/libavfilter/vf_thumbnail.c
@@ -189,7 +189,7 @@ static void get_hist16(int *hist, const uint8_t *p,
ptrdiff_t stride,
}
/* handle tail */
for (int x = width4; x < width; x++)
- hist[p16[x]]++;
+ hist[(uint8_t) (p16[x] >> shift)]++;
p += stride;
}
--
2.49.1
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