gimp: patch CVE-2025-14422

Details: https://nvd.nist.gov/vuln/detail/CVE-2025-14422

Backport the patch referenced by the NVD advisory.

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>

meta-gnome/recipes-gimp/gimp/gimp/CVE-2025-14422.patch

@@ -0,0 +1,66 @@
+From 03104e43a71f89678ea40c45dfaad6e1f570f0cc Mon Sep 17 00:00:00 2001
+From: Alx Sa <cmyk.student@gmail.com>
+Date: Sun, 23 Nov 2025 16:43:51 +0000
+Subject: [PATCH] plug-ins: Fix ZDI-CAN-28273
+
+Resolves #15286
+Adds a check to the memory allocation
+in pnm_load_raw () with g_size_checked_mul ()
+to see if the size would go out of bounds.
+If so, we don't try to allocate and load the
+image.
+
+(cherry picked from commit 4ff2d773d58064e6130495de498e440f4a6d5edb)
+
+CVE: CVE-2025-14422
+Upstream-Status: Backport [https://gitlab.gnome.org/GNOME/gimp/-/commit/1ac19bec2d5938af92e4687ed6721b97514e6644]
+Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
+---
+ plug-ins/common/file-pnm.c | 13 +++++++++++--
+ 1 file changed, 11 insertions(+), 2 deletions(-)
+
+diff --git a/plug-ins/common/file-pnm.c b/plug-ins/common/file-pnm.c
+index 2132eec..dda44c0 100644
+--- a/plug-ins/common/file-pnm.c
++++ b/plug-ins/common/file-pnm.c
+@@ -554,7 +554,7 @@ load_image (GFile   *file,
+             GError **error)
+ {
+   GInputStream    *input;
+-  GeglBuffer      *buffer;
++  GeglBuffer      *buffer   = NULL;
+   gint32 volatile  image_ID = -1;
+   gint32           layer_ID;
+   char             buf[BUFLEN + 4];  /* buffer for random things like scanning */
+@@ -584,6 +584,9 @@ load_image (GFile   *file,
+       g_object_unref (input);
+       g_free (pnminfo);
+ 
++      if (buffer)
++        g_object_unref (buffer);
++
+       if (image_ID != -1)
+         gimp_image_delete (image_ID);
+ 
+@@ -819,6 +822,7 @@ pnm_load_raw (PNMScanner *scan,
+   GInputStream *input;
+   gint          bpc;
+   guchar       *data, *d;
++  gsize         data_size;
+   gushort      *s;
+   gint          x, y, i;
+   gint          start, end, scanlines;
+@@ -829,7 +833,12 @@ pnm_load_raw (PNMScanner *scan,
+     bpc = 1;
+ 
+   /* No overflow as long as gimp_tile_height() < 1365 = 2^(31 - 18) / 6 */
+-  data = g_new (guchar, gimp_tile_height () * info->xres * info->np * bpc);
++  if (! g_size_checked_mul (&data_size, gimp_tile_height (), info->xres) ||
++      ! g_size_checked_mul (&data_size, data_size, info->np)             ||
++      ! g_size_checked_mul (&data_size, data_size, bpc))
++    CHECK_FOR_ERROR (FALSE, info->jmpbuf, _("Unsupported maximum value."));
++
++  data = g_new (guchar, data_size);
+ 
+   input = pnmscanner_input (scan);
+ 

meta-gnome/recipes-gimp/gimp/gimp_2.10.30.bb

@@ -51,6 +51,7 @@ SRC_URI = "https://download.gimp.org/pub/${BPN}/v${SHPV}/${BP}.tar.bz2 \
            file://CVE-2023-44441.patch \
            file://CVE-2023-44442.patch \
            file://CVE-2023-44443_CVE-2023-44444.patch \
+           file://CVE-2025-14422.patch \
            "
 SRC_URI[sha256sum] = "88815daa76ed7d4277eeb353358bafa116cd2fcd2c861d95b95135c1d52b67dc"