tiff: fix CVE-2025-8177

A vulnerability was found in LibTIFF up to 4.7.0. It has been
rated as critical. This issue affects the function setrow of the
file tools/thumbnail.c. The manipulation leads to buffer overflow.
An attack has to be approached locally. The patch is named
e8c9d6c616b19438695fd829e58ae4fde5bfbc22. It is recommended to
apply a patch to fix this issue. This vulnerability only affects
products that are no longer supported by the maintainer.

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2025-8177

Upstream patch:
e8de4dc1f9

(From OE-Core rev: fbf3238630c104c9e17d6e902986358cea5986ff)

Signed-off-by: Yogita Urade <yogita.urade@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-multimedia/libtiff/tiff/CVE-2025-8177.patch

@@ -0,0 +1,35 @@
+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

meta/recipes-multimedia/libtiff/tiff_4.3.0.bb

@@ -58,6 +58,7 @@ SRC_URI = "http://download.osgeo.org/libtiff/tiff-${PV}.tar.gz \
            file://CVE-2025-8176-0001.patch \
            file://CVE-2025-8176-0002.patch \
            file://CVE-2025-8176-0003.patch \
+           file://CVE-2025-8177.patch \
            "
 
 SRC_URI[sha256sum] = "0e46e5acb087ce7d1ac53cf4f56a09b221537fc86dfc5daaad1c2e89e1b37ac8"