diff options
| -rw-r--r-- | fs/proc/base.c | 38 |
1 files changed, 19 insertions, 19 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index 912a0306bb4d..4d8dac635da4 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2517,47 +2517,47 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, size_t count, loff_t *ppos) { struct inode * inode = file_inode(file); + struct task_struct *task; void *page; - ssize_t length; - struct task_struct *task = get_proc_task(inode); - - length = -ESRCH; - if (!task) - goto out_no_task; + int rv; + rcu_read_lock(); + task = pid_task(proc_pid(inode), PIDTYPE_PID); + if (!task) { + rcu_read_unlock(); + return -ESRCH; + } /* A task may only write its own attributes. */ - length = -EACCES; - if (current != task) - goto out; + if (current != task) { + rcu_read_unlock(); + return -EACCES; + } + rcu_read_unlock(); if (count > PAGE_SIZE) count = PAGE_SIZE; /* No partial writes. */ - length = -EINVAL; if (*ppos != 0) - goto out; + return -EINVAL; page = memdup_user(buf, count); if (IS_ERR(page)) { - length = PTR_ERR(page); + rv = PTR_ERR(page); goto out; } /* Guard against adverse ptrace interaction */ - length = mutex_lock_interruptible(¤t->signal->cred_guard_mutex); - if (length < 0) + rv = mutex_lock_interruptible(¤t->signal->cred_guard_mutex); + if (rv < 0) goto out_free; - length = security_setprocattr(file->f_path.dentry->d_name.name, - page, count); + rv = security_setprocattr(file->f_path.dentry->d_name.name, page, count); mutex_unlock(¤t->signal->cred_guard_mutex); out_free: kfree(page); out: - put_task_struct(task); -out_no_task: - return length; + return rv; } static const struct file_operations proc_pid_attr_operations = { |