!26 mdadm: backport one patch to fix segfault problem in monitor.c

From: @liuzhiqiang26 
Reviewed-by: @gqmiao, @louhongxiang 
Signed-off-by: @volcanodragon

0003-monitor-Avoid-segfault-when-calling-NULL-get_bad_blo.patch

@@ -0,0 +1,35 @@
+From 9ae62977b51dab0f4bb46b1c8ea5ebd1705b2f4d Mon Sep 17 00:00:00 2001
+From: Logan Gunthorpe <logang@deltatee.com>
+Date: Wed, 22 Jun 2022 14:25:10 -0600
+Subject: [PATCH] monitor: Avoid segfault when calling NULL get_bad_blocks
+
+Not all struct superswitch implement a get_bad_blocks() function,
+yet mdmon seems to call it without checking for NULL and thus
+occasionally segfaults in the test 10ddf-geometry.
+
+Fix this by checking for NULL before calling it.
+
+Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
+Acked-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
+Signed-off-by: Jes Sorensen <jes@trained-monkey.org>
+---
+ monitor.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/monitor.c b/monitor.c
+index b877e595..820a93d0 100644
+--- a/monitor.c
++++ b/monitor.c
+@@ -311,6 +311,9 @@ static int check_for_cleared_bb(struct active_array *a, struct mdinfo *mdi)
+ 	struct md_bb *bb;
+ 	int i;
+ 
++	if (!ss->get_bad_blocks)
++		return -1;
++
+ 	/*
+ 	 * Get a list of bad blocks for an array, then read list of
+ 	 * acknowledged bad blocks from kernel and compare it against metadata
+-- 
+2.33.0
+

mdadm.spec

@@ -1,6 +1,6 @@
 Name:     mdadm
 Version:  4.2
-Release:  1
+Release:  2
 Summary:  The software RAID arrays user manage tools
 License:  GPLv2+
 URL:      http://www.kernel.org/pub/linux/utils/raid/mdadm/
@@ -12,6 +12,7 @@ Source3:  mdadm.conf
 
 Patch1:  0001-mdadm-remove-Werror-to-fix-Werror-address-of-packed-.patch
 Patch2:  0002-mdadm-Fix-mdadm-r-remove-option-regresision.patch
+Patch3:  0003-monitor-Avoid-segfault-when-calling-NULL-get_bad_blo.patch
 
 BuildRequires:    systemd gcc binutils libudev-devel
 Requires(post):   systemd coreutils
@@ -77,6 +78,9 @@ install -d -m 710 %{buildroot}/var/run/mdadm/
 %{_mandir}/man*/*
 
 %changelog
+* Mon Nov 14 2022 Zhiqiang Liu <liuzhiqiang26@huawei.com> - 4.2-2
+- backport upstream bugfix patch to fix segfault problem
+
 * Mon Oct 17 2022 wuguanghao <wuguanghao3@huawei.com> - 4.2-1
 - upgrade version to 4.2