zlib: add patch for CVE-2022-37434

Change-Id: If09c419ba00fc9be021249e4d4da27d1650b9080
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/139913
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>

3 files changed, 67 insertions, 1 deletions

diff --git a/external/zlib/1eb7682f845ac9e9bf9ae35bbfb3bad5dacbd91d.patch b/external/zlib/1eb7682f845ac9e9bf9ae35bbfb3bad5dacbd91d.patch
new file mode 100644
index 000000000000..c5c95a92b28a
--- /dev/null
+++ b/external/zlib/1eb7682f845ac9e9bf9ae35bbfb3bad5dacbd91d.patch
@@ -0,0 +1,29 @@
+From 1eb7682f845ac9e9bf9ae35bbfb3bad5dacbd91d Mon Sep 17 00:00:00 2001
+From: Mark Adler <fork@madler.net>
+Date: Mon, 8 Aug 2022 10:50:09 -0700
+Subject: [PATCH] Fix extra field processing bug that dereferences NULL
+ state->head.
+
+The recent commit to fix a gzip header extra field processing bug
+introduced the new bug fixed here.
+---
+ inflate.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/inflate.c b/inflate.c
+index 7a7289749..2a3c4fe98 100644
+--- a/inflate.c
++++ b/inflate.c
+@@ -763,10 +763,10 @@ int flush;
+                 copy = state->length;
+                 if (copy > have) copy = have;
+                 if (copy) {
+-                    len = state->head->extra_len - state->length;
+                     if (state->head != Z_NULL &&
+                         state->head->extra != Z_NULL &&
+-                        len < state->head->extra_max) {
++                        (len = state->head->extra_len - state->length) <
++                            state->head->extra_max) {
+                         zmemcpy(state->head->extra + len, next,
+                                 len + copy > state->head->extra_max ?
+                                 state->head->extra_max - len : copy);
diff --git a/external/zlib/UnpackedTarball_zlib.mk b/external/zlib/UnpackedTarball_zlib.mk
index dd9fc1c31445..10ee74b9568a 100644
--- a/external/zlib/UnpackedTarball_zlib.mk
+++ b/external/zlib/UnpackedTarball_zlib.mk
@@ -16,6 +16,11 @@ $(eval $(call gb_UnpackedTarball_set_post_action,zlib,\
 	cp $(addsuffix .c,adler32 compress crc32 deflate inffast inflate inftrees trees zutil) x64 \
 ))
 
-$(eval $(call gb_UnpackedTarball_set_patchlevel,zlib,0))
+$(eval $(call gb_UnpackedTarball_set_patchlevel,zlib,1))
+
+$(eval $(call gb_UnpackedTarball_add_patches,zlib,\
+	external/zlib/eff308af425b67093bab25f80f1ae950166bece1.patch \
+	external/zlib/1eb7682f845ac9e9bf9ae35bbfb3bad5dacbd91d.patch \
+))
 
 # vim: set noet sw=4 ts=4:
diff --git a/external/zlib/eff308af425b67093bab25f80f1ae950166bece1.patch b/external/zlib/eff308af425b67093bab25f80f1ae950166bece1.patch
new file mode 100644
index 000000000000..dc84d3a1d385
--- /dev/null
+++ b/external/zlib/eff308af425b67093bab25f80f1ae950166bece1.patch
@@ -0,0 +1,32 @@
+From eff308af425b67093bab25f80f1ae950166bece1 Mon Sep 17 00:00:00 2001
+From: Mark Adler <fork@madler.net>
+Date: Sat, 30 Jul 2022 15:51:11 -0700
+Subject: [PATCH] Fix a bug when getting a gzip header extra field with
+ inflate().
+
+If the extra field was larger than the space the user provided with
+inflateGetHeader(), and if multiple calls of inflate() delivered
+the extra header data, then there could be a buffer overflow of the
+provided space. This commit assures that provided space is not
+exceeded.
+---
+ inflate.c | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/inflate.c b/inflate.c
+index 7be8c6366..7a7289749 100644
+--- a/inflate.c
++++ b/inflate.c
+@@ -763,9 +763,10 @@ int flush;
+                 copy = state->length;
+                 if (copy > have) copy = have;
+                 if (copy) {
++                    len = state->head->extra_len - state->length;
+                     if (state->head != Z_NULL &&
+-                        state->head->extra != Z_NULL) {
+-                        len = state->head->extra_len - state->length;
++                        state->head->extra != Z_NULL &&
++                        len < state->head->extra_max) {
+                         zmemcpy(state->head->extra + len, next,
+                                 len + copy > state->head->extra_max ?
+                                 state->head->extra_max - len : copy);