From 0e326df069802dc48e4f095f889cb780e4beaba6 Mon Sep 17 00:00:00 2001
From: Paul Moore <paul@paul-moore.com>
Date: Thu, 27 Jan 2022 10:56:13 -0500
Subject: [PATCH] selinux: various sparse fixes

When running the SELinux code through sparse, there are a handful of
warnings.  This patch resolves some of these warnings caused by
"__rcu" mismatches.

 % make W=1 C=1 security/selinux/

Signed-off-by: Paul Moore <paul@paul-moore.com>
---
 security/selinux/hooks.c   | 6 +++---
 security/selinux/ibpkey.c  | 2 +-
 security/selinux/netnode.c | 5 +++--
 security/selinux/netport.c | 2 +-
 4 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index b60481192b38..b24a1aeeedd4 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2553,7 +2553,7 @@ static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
 	if (rc) {
 		clear_itimer();
 
-		spin_lock_irq(&current->sighand->siglock);
+		spin_lock_irq(&unrcu_pointer(current->sighand)->siglock);
 		if (!fatal_signal_pending(current)) {
 			flush_sigqueue(&current->pending);
 			flush_sigqueue(&current->signal->shared_pending);
@@ -2561,13 +2561,13 @@ static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
 			sigemptyset(&current->blocked);
 			recalc_sigpending();
 		}
-		spin_unlock_irq(&current->sighand->siglock);
+		spin_unlock_irq(&unrcu_pointer(current->sighand)->siglock);
 	}
 
 	/* Wake up the parent if it is waiting so that it can recheck
 	 * wait permission to the new task SID. */
 	read_lock(&tasklist_lock);
-	__wake_up_parent(current, current->real_parent);
+	__wake_up_parent(current, unrcu_pointer(current->real_parent));
 	read_unlock(&tasklist_lock);
 }
 
diff --git a/security/selinux/ibpkey.c b/security/selinux/ibpkey.c
index 20b3b2243820..5839ca7bb9c7 100644
--- a/security/selinux/ibpkey.c
+++ b/security/selinux/ibpkey.c
@@ -104,7 +104,7 @@ static void sel_ib_pkey_insert(struct sel_ib_pkey *pkey)
 
 		tail = list_entry(
 			rcu_dereference_protected(
-				sel_ib_pkey_hash[idx].list.prev,
+				list_tail_rcu(&sel_ib_pkey_hash[idx].list),
 				lockdep_is_held(&sel_ib_pkey_lock)),
 			struct sel_ib_pkey, list);
 		list_del_rcu(&tail->list);
diff --git a/security/selinux/netnode.c b/security/selinux/netnode.c
index 889552db0d31..0ac7df9a9367 100644
--- a/security/selinux/netnode.c
+++ b/security/selinux/netnode.c
@@ -164,8 +164,9 @@ static void sel_netnode_insert(struct sel_netnode *node)
 	if (sel_netnode_hash[idx].size == SEL_NETNODE_HASH_BKT_LIMIT) {
 		struct sel_netnode *tail;
 		tail = list_entry(
-			rcu_dereference_protected(sel_netnode_hash[idx].list.prev,
-						  lockdep_is_held(&sel_netnode_lock)),
+			rcu_dereference_protected(
+				list_tail_rcu(&sel_netnode_hash[idx].list),
+				lockdep_is_held(&sel_netnode_lock)),
 			struct sel_netnode, list);
 		list_del_rcu(&tail->list);
 		kfree_rcu(tail, rcu);
diff --git a/security/selinux/netport.c b/security/selinux/netport.c
index 9ba09d11c0f5..8eec6347cf01 100644
--- a/security/selinux/netport.c
+++ b/security/selinux/netport.c
@@ -113,7 +113,7 @@ static void sel_netport_insert(struct sel_netport *port)
 		struct sel_netport *tail;
 		tail = list_entry(
 			rcu_dereference_protected(
-				sel_netport_hash[idx].list.prev,
+				list_tail_rcu(&sel_netport_hash[idx].list),
 				lockdep_is_held(&sel_netport_lock)),
 			struct sel_netport, list);
 		list_del_rcu(&tail->list);