fix GCC-11 build failure, h/t Jeff Law

0009-fix-GCC-11-build-failure.patch

@@ -0,0 +1,52 @@
+From 840b639f9e807e1dab4e14817fe72657b9252e53 Mon Sep 17 00:00:00 2001
+From: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
+Date: Thu, 17 Sep 2020 20:31:25 +0530
+Subject: lib/sysfs_class: fix build failure reported on GCC-11
+
+Christopher reported that, the build fails with GCC-11. It introduces a
+-Wstringop-overread, that warns about reading past the end in string
+functions. cdev_name_equal() does a comparison, which compares strings
+past SYSFS_NAME_LEN. It currently calculates the string lengths of both
+string and does a comparison on strings of equal length.
+
+This patch refactors the function to compare, the strings until
+SYSFS_NAME_LEN, removing the string length comparison logic.
+
+Fixes #12 ("Build failure with GCC-11 due to stringop-overread")
+Reported-by: Christopher Engelhard <ce@lcts.de>
+Tested-by: Christopher Engelhard <ce@lcts.de>
+Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
+---
+ lib/sysfs_class.c | 9 +--------
+ 1 file changed, 1 insertion(+), 8 deletions(-)
+
+diff --git a/lib/sysfs_class.c b/lib/sysfs_class.c
+index fcaa488..6389892 100644
+--- a/lib/sysfs_class.c
++++ b/lib/sysfs_class.c
+@@ -68,7 +68,6 @@ void sysfs_close_class(struct sysfs_class *cls)
+  */
+ static int cdev_name_equal(void *a, void *b)
+ {
+-	size_t length_a, length_b;
+ 	char *str_a, *str_b;
+ 
+ 	if (!a || !b)
+@@ -77,13 +76,7 @@ static int cdev_name_equal(void *a, void *b)
+ 	str_a = (char *)a;
+ 	str_b = ((struct sysfs_class_device *)b)->name;
+ 
+-	length_a = strnlen(str_a, SYSFS_NAME_LEN+1);
+-	length_b = strnlen(str_b, SYSFS_NAME_LEN+1);
+-
+-	if (length_a != length_b)
+-		return 0;
+-
+-	if (strncmp(str_a, str_b, length_a+1) == 0)
++	if (strncmp(str_a, str_b, SYSFS_NAME_LEN) == 0)
+ 		return 1;
+ 
+ 	return 0;
+-- 
+2.26.2
+

sysfsutils.spec

@@ -22,6 +22,8 @@ Patch6:         0006-limit-cdev-name-length-comparsion.patch
 Patch7:         0007-fix-sysfs_get_link.patch
 # upstreamed version of formatting/typo/license-related fedora patches, PR#9
 Patch8:         0008-clarify-license-fix-typos.patch
+# upstream issue #12 / PR#13
+Patch9:         0009-fix-GCC-11-build-failure.patch
 
 BuildRequires:  gcc