package/libexif: security bump to version 0.6.23

- Drop patches (already in version)
- Fix some more denial of service (compute time or stack exhaustion)
  counter-measures added that avoid minutes of decoding time with
  malformed files found by OSS-Fuzz

https://github.com/libexif/libexif/releases/tag/v0.6.23

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libexif/0001-fixed-another-unsigned-integer-overflow.patch

@@ -1,63 +0,0 @@
-From ce03ad7ef4e8aeefce79192bf5b6f69fae396f0c Mon Sep 17 00:00:00 2001
-From: Marcus Meissner <marcus@jet.franken.de>
-Date: Mon, 8 Jun 2020 17:27:06 +0200
-Subject: [PATCH] fixed another unsigned integer overflow
-
-first fixed by google in android fork,
-https://android.googlesource.com/platform/external/libexif/+/1e187b62682ffab5003c702657d6d725b4278f16%5E%21/#F0
-
-(use a more generic overflow check method, also check second overflow instance.)
-
-https://security-tracker.debian.org/tracker/CVE-2020-0198
-
-Downloaded from upstream commit:
-https://github.com/libexif/libexif/commit/ce03ad7ef4e8aeefce79192bf5b6f69fae396f0c
-
-Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
----
- libexif/exif-data.c | 10 ++++++----
- 1 file changed, 6 insertions(+), 4 deletions(-)
-
-diff --git a/libexif/exif-data.c b/libexif/exif-data.c
-index 8b280d3..b495726 100644
---- a/libexif/exif-data.c
-+++ b/libexif/exif-data.c
-@@ -47,6 +47,8 @@
- #undef JPEG_MARKER_APP1
- #define JPEG_MARKER_APP1 0xe1
- 
-+#define CHECKOVERFLOW(offset,datasize,structsize) (( offset >= datasize) || (structsize > datasize) || (offset > datasize - structsize ))
-+
- static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
- 
- struct _ExifDataPrivate
-@@ -327,7 +329,7 @@ exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
- 		exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData", "Bogus thumbnail offset (%u).", o);
- 		return;
- 	}
--	if (s > ds - o) {
-+	if (CHECKOVERFLOW(o,ds,s)) {
- 		exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData", "Bogus thumbnail size (%u), max would be %u.", s, ds-o);
- 		return;
- 	}
-@@ -420,9 +422,9 @@ exif_data_load_data_content (ExifData *data, ExifIfd ifd,
- 	}
- 
- 	/* Read the number of entries */
--	if ((offset + 2 < offset) || (offset + 2 < 2) || (offset + 2 > ds)) {
-+	if (CHECKOVERFLOW(offset, ds, 2)) {
- 		exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
--			  "Tag data past end of buffer (%u > %u)", offset+2, ds);
-+			  "Tag data past end of buffer (%u+2 > %u)", offset, ds);
- 		return;
- 	}
- 	n = exif_get_short (d + offset, data->priv->order);
-@@ -431,7 +433,7 @@ exif_data_load_data_content (ExifData *data, ExifIfd ifd,
- 	offset += 2;
- 
- 	/* Check if we have enough data. */
--	if (offset + 12 * n > ds) {
-+	if (CHECKOVERFLOW(offset, ds, 12*n)) {
- 		n = (ds - offset) / 12;
- 		exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
- 				  "Short data; only loading %hu entries...", n);

package/libexif/0002-fixed-a-incorrect-overflow-check.patch

@@ -1,36 +0,0 @@
-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
-
-Downloaded from upstream commit, rebased for 0.6.22:
-https://github.com/libexif/libexif/commit/9266d14b5ca4e29b970fa03272318e5f99386e06
-
-Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
----
- libexif/exif-entry.c | 4 ++--
- 1 file changed, 2 insertions(+), 2 deletions(-)
-
-diff --git a/libexif/exif-entry.c b/libexif/exif-entry.c
-index 3fc0ff9..4b866ce 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 */

package/libexif/libexif.hash

@@ -1,3 +1,3 @@
 # Locally computed:
-sha256  5048f1c8fc509cc636c2f97f4b40c293338b6041a5652082d5ee2cf54b530c56  libexif-0.6.22.tar.xz
+sha256  a740a99920eb81ae0aa802bb46e683ce6e0cde061c210f5d5bde5b8572380431  libexif-0.6.23.tar.xz
 sha256  36b6d3fa47916943fd5fec313c584784946047ec1337a78b440e5992cb595f89  COPYING

package/libexif/libexif.mk

@@ -4,18 +4,14 @@
 #
 ################################################################################
 
-LIBEXIF_VERSION = 0.6.22
+LIBEXIF_VERSION = 0.6.23
 LIBEXIF_SOURCE = libexif-$(LIBEXIF_VERSION).tar.xz
 LIBEXIF_SITE = \
-	https://github.com/libexif/libexif/releases/download/libexif-$(subst .,_,$(LIBEXIF_VERSION))-release
+	https://github.com/libexif/libexif/releases/download/v$(LIBEXIF_VERSION)
 LIBEXIF_INSTALL_STAGING = YES
 LIBEXIF_DEPENDENCIES = host-pkgconf
 LIBEXIF_LICENSE = LGPL-2.1+
 LIBEXIF_LICENSE_FILES = COPYING
 LIBEXIF_CPE_ID_VENDOR = libexif_project
-# 0001-fixed-another-unsigned-integer-overflow.patch
-LIBEXIF_IGNORE_CVES += CVE-2020-0198
-# 0002-fixed-a-incorrect-overflow-check.patch
-LIBEXIF_IGNORE_CVES += CVE-2020-0452
 
 $(eval $(autotools-package))