1 files changed, 31 insertions, 0 deletions
diff --git a/patches/zlib-1.2.12/0002-Fix-a-bug-when-getting-a-gzip-header-extra-field-wit.patch b/patches/zlib-1.2.12/0002-Fix-a-bug-when-getting-a-gzip-header-extra-field-wit.patch
new file mode 100644
index 000000000..e8b36be46
--- /dev/null
+++ b/patches/zlib-1.2.12/0002-Fix-a-bug-when-getting-a-gzip-header-extra-field-wit.patch
@@ -0,0 +1,31 @@
+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 7be8c63662a7..7a728974923a 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);