Merge remote-tracking branch 'asoc/for-5.10' into asoc-linus

1 files changed, 8 insertions, 3 deletions

diff --git a/fs/nfs/sysfs.c b/fs/nfs/sysfs.c
index c489496b5659..8cb70755e3c9 100644
--- a/fs/nfs/sysfs.c
+++ b/fs/nfs/sysfs.c
@@ -79,7 +79,12 @@ static ssize_t nfs_netns_identifier_show(struct kobject *kobj,
 	struct nfs_netns_client *c = container_of(kobj,
 			struct nfs_netns_client,
 			kobject);
-	return scnprintf(buf, PAGE_SIZE, "%s\n", c->identifier);
+	ssize_t ret;
+
+	rcu_read_lock();
+	ret = scnprintf(buf, PAGE_SIZE, "%s\n", rcu_dereference(c->identifier));
+	rcu_read_unlock();
+	return ret;
 }
 
 /* Strip trailing '\n' */
@@ -107,7 +112,7 @@ static ssize_t nfs_netns_identifier_store(struct kobject *kobj,
 	p = kmemdup_nul(buf, len, GFP_KERNEL);
 	if (!p)
 		return -ENOMEM;
-	old = xchg(&c->identifier, p);
+	old = rcu_dereference_protected(xchg(&c->identifier, (char __rcu *)p), 1);
 	if (old) {
 		synchronize_rcu();
 		kfree(old);
@@ -121,7 +126,7 @@ static void nfs_netns_client_release(struct kobject *kobj)
 			struct nfs_netns_client,
 			kobject);
 
-	kfree(c->identifier);
+	kfree(rcu_dereference_raw(c->identifier));
 	kfree(c);
 }