jpeg: Be more careful with chunked icc data

Resolves: #RHEL-102343

0001-jpeg-Be-more-careful-with-chunked-icc-data.patch

@@ -0,0 +1,50 @@
+From 4af78023ce7d3b5e3cec422a59bb4f48fa4f5886 Mon Sep 17 00:00:00 2001
+From: Matthias Clasen <mclasen@redhat.com>
+Date: Fri, 11 Jul 2025 11:02:05 -0400
+Subject: [PATCH] jpeg: Be more careful with chunked icc data
+
+We we inadvertendly trusting the sequence numbers not to lie.
+If they do we would report a larger data size than we actually
+allocated, leading to out of bounds memory access in base64
+encoding later on.
+
+This has been assigned CVE-2025-7345.
+
+Fixes: #249
+---
+ gdk-pixbuf/io-jpeg.c | 8 ++++++--
+ 1 file changed, 6 insertions(+), 2 deletions(-)
+
+diff --git a/gdk-pixbuf/io-jpeg.c b/gdk-pixbuf/io-jpeg.c
+index 9cfd29718..103820c5a 100644
+--- a/gdk-pixbuf/io-jpeg.c
++++ b/gdk-pixbuf/io-jpeg.c
+@@ -359,6 +359,7 @@ jpeg_parse_exif_app2_segment (JpegExifContext *context, jpeg_saved_marker_ptr ma
+ 		context->icc_profile = g_new (gchar, chunk_size);
+ 		/* copy the segment data to the profile space */
+ 		memcpy (context->icc_profile, marker->data + 14, chunk_size);
++                ret = TRUE;
+ 		goto out;
+ 	}
+ 
+@@ -380,12 +381,15 @@ jpeg_parse_exif_app2_segment (JpegExifContext *context, jpeg_saved_marker_ptr ma
+ 	/* copy the segment data to the profile space */
+ 	memcpy (context->icc_profile + offset, marker->data + 14, chunk_size);
+ 
+-	/* it's now this big plus the new data we've just copied */
+-	context->icc_profile_size += chunk_size;
++        context->icc_profile_size = MAX (context->icc_profile_size, offset + chunk_size);
+ 
+ 	/* success */
+ 	ret = TRUE;
+ out:
++        if (!ret) {
++                g_free (context->icc_profile);
++                context->icc_profile = NULL;
++        }
+ 	return ret;
+ }
+ 
+-- 
+2.50.0
+

gdk-pixbuf2.spec

@@ -8,6 +8,7 @@ Summary:        An image loading library
 License:        LGPL-2.1-or-later
 URL:            https://gitlab.gnome.org/GNOME/gdk-pixbuf
 Source0:        https://download.gnome.org/sources/gdk-pixbuf/2.42/gdk-pixbuf-%{version}.tar.xz
+Patch0:         0001-jpeg-Be-more-careful-with-chunked-icc-data.patch
 
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