fix CVE-2020-0452

(cherry picked from commit a0bdb8e72e934c6f773ed6a461837afb5473e998)

backport-CVE-2020-0452.patch

@@ -0,0 +1,31 @@
+From 9266d14b5ca4e29b970fa03272318e5f99386e06 Mon Sep 17 00:00:00 2001
+From: Marcus Meissner <marcus@jet.franken.de>
+Date: Thu, 5 Nov 2020 09:50:08 +0100
+Subject: [PATCH] fixed a incorrect overflow check that could be optimized
+ away.
+
+inspired by:
+https://android.googlesource.com/platform/external/libexif/+/8e7345f3bc0bad06ac369d6cbc1124c8ceaf7d4b
+
+https://source.android.com/security/bulletin/2020-11-01
+
+CVE-2020-0452
+---
+ libexif/exif-entry.c | 4 ++--
+ 1 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/libexif/exif-entry.c b/libexif/exif-entry.c
+index 3fc0ff92..4b866cee 100644
+--- a/libexif/exif-entry.c
++++ b/libexif/exif-entry.c
+@@ -1371,8 +1371,8 @@ exif_entry_get_value (ExifEntry *e, char *val, unsigned int maxlen)
+ 	{
+ 		unsigned char *utf16;
+ 
+-		/* Sanity check the size to prevent overflow */
+-		if (e->size+sizeof(uint16_t)+1 < e->size) break;
++		/* Sanity check the size to prevent overflow. Note EXIF files are 64kb at most. */
++		if (e->size >= 65536 - sizeof(uint16_t)*2) break;
+ 
+ 		/* The tag may not be U+0000-terminated , so make a local
+ 		   U+0000-terminated copy before converting it */

libexif.spec

@@ -1,7 +1,7 @@
 Name:           libexif
 Summary:        Library for extracting extra information from image files
 Version:        0.6.22
-Release:        4
+Release:        5
 License:        LGPLv2+
 URL:            https://libexif.github.io/
 
@@ -10,6 +10,8 @@ Source0:        https://github.com/libexif/libexif/archive/libexif-%(echo %{vers
 Patch0:         CVE-2020-0198.patch
 Patch6000:	backport-fuzz-stack-overflow.patch
 Patch6001:	backport-fuzz-timeout-and-out-of-memory.patch
+Patch6002:      backport-CVE-2020-0452.patch
+
 Patch9000:	libexif-bugfix-integer-overflow-pentax.patch
 
 BuildRequires:  autoconf automake doxygen gettext-devel libtool pkgconfig
@@ -70,6 +72,9 @@ make check
 %doc libexif-api.html NEWS
 
 %changelog
+* Mon Jan 15 2024 zhouwenpei <zhouwenpei1@h-partners.com> - 0.6.22-5
+- fix CVE-2020-0452
+
 * Thu Aug 24 2023 zhouwenpei <zhouwenpei1@h-partners.com> - 0.6.22-4
 - fix typo in changelog