diff --git a/miniz-2.2.0-Fix-use-of-uninitialized-memory-in-tinfl_decompress_.patch b/miniz-2.2.0-Fix-use-of-uninitialized-memory-in-tinfl_decompress_.patch
new file mode 100644
index 0000000..80ec355
--- /dev/null
+++ b/miniz-2.2.0-Fix-use-of-uninitialized-memory-in-tinfl_decompress_.patch
@@ -0,0 +1,32 @@
+From 98f4698e81e6d06653201639cf9a75c3c1464884 Mon Sep 17 00:00:00 2001
+From: Cameron Cawley <ccawley2011@gmail.com>
+Date: Sun, 25 Jul 2021 15:36:22 +0100
+Subject: [PATCH] Fix use of uninitialized memory in
+ tinfl_decompress_mem_to_callback()
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Co-authored-by: sezero <sezero@users.noreply.github.com>
+Petr Písař: Ported to 2.2.0.
+
+Signed-off-by: Petr Písař <ppisar@redhat.com>
+---
+ miniz.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/miniz.c b/miniz.c
+index 87bdedb..af27389 100644
+--- a/miniz.c
++++ b/miniz.c
+@@ -2916,6 +2916,7 @@ int tinfl_decompress_mem_to_callback(const void *pIn_buf, size_t *pIn_buf_size,
+     size_t in_buf_ofs = 0, dict_ofs = 0;
+     if (!pDict)
+         return TINFL_STATUS_FAILED;
++    memset(pDict,0,TINFL_LZ_DICT_SIZE);
+     tinfl_init(&decomp);
+     for (;;)
+     {
+-- 
+2.34.1
+
diff --git a/miniz.spec b/miniz.spec
index 4c6fb73..f96a95f 100644
--- a/miniz.spec
+++ b/miniz.spec
@@ -4,7 +4,7 @@
 
 Name:       miniz
 Version:    2.2.0
-Release:    1%{?dist}
+Release:    2%{?dist}
 Summary:    Compression library implementing the zlib and Deflate
 # LICENSE:  MIT text
 # miniz.c:  MIT
@@ -17,6 +17,9 @@ Source0:    %{url}/releases/download/%{version}/%{name}-%{version}.zip
 # Adjust examples for building against a system miniz library,
 # not suitable for upstream that prefers a copy-lib approach.
 Patch0:     miniz-2.2.0-Examples-to-include-system-miniz.h.patch
+# Fix an unitialized memory in tinfl_decompress_mem_to_callback(), GH#197,
+# in upstream after 2.2.0.
+Patch1:     miniz-2.2.0-Fix-use-of-uninitialized-memory-in-tinfl_decompress_.patch
 BuildRequires:  coreutils
 # diffutils for cmp
 BuildRequires:  diffutils
@@ -55,6 +58,7 @@ Header files for developing applications that use the %{name} library.
 %setup -c -T -n %{name}-%{version}
 unzip -e '%{SOURCE0}'
 %patch0 -p1
+%patch1 -p1
 # Normalize end-of-lines
 sed -e 's/\r$//' ChangeLog.md > ChangeLog.md.new
 touch -r ChangeLog.md ChangeLog.md.new
@@ -131,6 +135,9 @@ install -m 0644 %{name}.h '%{buildroot}/%{_includedir}'
 
 
 %changelog
+* Mon Jan 24 2022 Petr Pisar <ppisar@redhat.com> - 2.2.0-2
+- Fix an unitialized memory in tinfl_decompress_mem_to_callback() (GH#197)
+
 * Wed Aug 11 2021 Petr Pisar <ppisar@redhat.com> - 2.2.0-1
 - 2.2.0 bump