diff --git a/libcap-2.22-signed-sizeof-compare.patch b/libcap-2.22-signed-sizeof-compare.patch
new file mode 100644
index 0000000..4ada3fa
--- /dev/null
+++ b/libcap-2.22-signed-sizeof-compare.patch
@@ -0,0 +1,21 @@
+diff -up libcap-2.22/libcap/cap_file.c.911878 libcap-2.22/libcap/cap_file.c
+--- libcap-2.22/libcap/cap_file.c.911878	2013-05-14 11:45:25.569448468 +0200
++++ libcap-2.22/libcap/cap_file.c	2013-05-14 11:47:04.712036407 +0200
+@@ -187,7 +187,7 @@ cap_t cap_get_fd(int fildes)
+ 	/* fill the capability sets via a system call */
+ 	sizeofcaps = fgetxattr(fildes, XATTR_NAME_CAPS,
+ 			       &rawvfscap, sizeof(rawvfscap));
+-	if (sizeofcaps < sizeof(rawvfscap.magic_etc)) {
++	if (sizeofcaps < (int) sizeof(rawvfscap.magic_etc)) {
+ 	    cap_free(result);
+ 	    result = NULL;
+ 	} else {
+@@ -217,7 +217,7 @@ cap_t cap_get_file(const char *filename)
+ 	/* fill the capability sets via a system call */
+ 	sizeofcaps = getxattr(filename, XATTR_NAME_CAPS,
+ 			      &rawvfscap, sizeof(rawvfscap));
+-	if (sizeofcaps < sizeof(rawvfscap.magic_etc)) {
++	if (sizeofcaps < (int) sizeof(rawvfscap.magic_etc)) {
+ 	    cap_free(result);
+ 	    result = NULL;
+ 	} else {
diff --git a/libcap.spec b/libcap.spec
index d377c60..f5b1d03 100644
--- a/libcap.spec
+++ b/libcap.spec
@@ -1,8 +1,9 @@
 Name: libcap
 Version: 2.22
-Release: 3%{?dist}
+Release: 4%{?dist}
 Summary: Library for getting and setting POSIX.1e capabilities
 Source: http://www.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/%{name}-%{version}.tar.bz2
+Patch0: libcap-2.22-signed-sizeof-compare.patch
 
 URL: http://ftp.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/
 License: LGPLv2+
@@ -30,6 +31,7 @@ libcap.
 
 %prep
 %setup -q
+%patch0 -p1
 
 %build
 # libcap can not be build with _smp_mflags:
@@ -76,6 +78,10 @@ chmod +x ${RPM_BUILD_ROOT}/%{_lib}/*.so.*
 rm -rf ${RPM_BUILD_ROOT}
 
 %changelog
+* Tue May 14 2013 Karsten Hopp <karsten@redhat.com> 2.22-4
+- add patch from Mark Wielaard to fix use of uninitialized memory in _fcaps_load
+  rhbz #911878
+
 * Thu Jul 19 2012 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 2.22-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_18_Mass_Rebuild