ipmi: bail out if init_srcu_struct fails

stable inclusion
from stable-v5.10.89
commit a5192f31160c1739ef6525ed77d6aafa8e6565dd
bugzilla: 186140 https://gitee.com/openeuler/kernel/issues/I4S8HA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a5192f31160c1739ef6525ed77d6aafa8e6565dd

--------------------------------

commit 2b5160b1 upstream.

In case, init_srcu_struct fails (because of memory allocation failure), we
might proceed with the driver initialization despite srcu_struct not being
entirely initialized.

Fixes: 913a89f0 ("ipmi: Don't initialize anything in the core until something uses it")
Signed-off-by: NThadeu Lima de Souza Cascardo <cascardo@canonical.com>
Cc: Corey Minyard <cminyard@mvista.com>
Cc: stable@vger.kernel.org
Message-Id: <20211217154410.1228673-1-cascardo@canonical.com>
Signed-off-by: NCorey Minyard <cminyard@mvista.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/char/ipmi/ipmi_msghandler.c

@@ -5161,7 +5161,9 @@ static int ipmi_init_msghandler(void)
 	if (initialized)
 		goto out;
 
-	init_srcu_struct(&ipmi_interfaces_srcu);
+	rv = init_srcu_struct(&ipmi_interfaces_srcu);
+	if (rv)
+		goto out;
 
 	timer_setup(&ipmi_timer, ipmi_timeout, 0);
 	mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);