Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6

[firefly-linux-kernel-4.4.55.git] / fs / proc / base.c

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 746895ddfda16982ce7ae751aca4d2f2a964b8a5..a7310841c83149e406c1089d30a8c27b2c1e67fb 100644 (file)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1089,8 +1089,12 @@ static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
        if (!capable(CAP_AUDIT_CONTROL))
                return -EPERM;
 
-       if (current != pid_task(proc_pid(inode), PIDTYPE_PID))
+       rcu_read_lock();
+       if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
+               rcu_read_unlock();
                return -EPERM;
+       }
+       rcu_read_unlock();
 
        if (count >= PAGE_SIZE)
                count = PAGE_SIZE - 1;