From e8de4dc1f923576dce9d625caeebd93f9db697e1 Mon Sep 17 00:00:00 2001
From: Lee Howard <faxguy@howardsilvan.com>
Date: Wed, 25 Jun 2025 17:14:18 +0000
Subject: [PATCH] Fix for thumbnail issue #715

CVE: CVE-2025-8177
Upstream-Status: Backport [https://gitlab.com/libtiff/libtiff/-/commit/e8de4dc1f923576dce9d625caeebd93f9db697e1]

Signed-off-by: Yogita Urade <yogita.urade@windriver.com>
---
 tools/thumbnail.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/thumbnail.c b/tools/thumbnail.c
index 274705d..8960d36 100644
--- a/tools/thumbnail.c
+++ b/tools/thumbnail.c
@@ -538,7 +538,15 @@ setrow(uint8_t* row, uint32_t nrows, const uint8_t* rows[])
	    }
	    acc += bits[*src & mask1];
	}
+	if (255 * acc / area < 256)
+        {
	*row++ = cmap[(255*acc)/area];
+        }
+	else
+        {
+            fprintf(stderr, "acc=%d, area=%d\n", acc, area);
+            *row++ = cmap[0];
+        }
     }
 }

--
2.40.0