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proc: Put thread_pid in release_task not proc_flush_pid

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Oleg pointed out that in the unlikely event the kernel is compiled
with CONFIG_PROC_FS unset that release_task will now leak the pid.

Move the put_pid out of proc_flush_pid into release_task to fix this
and to guarantee I don't make that mistake again.

When possible it makes sense to keep get and put in the same function
so it can easily been seen how they pair up.

Fixes: 7bc3e6e55a ("proc: Use a list of inodes to flush from proc")
Reported-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2020-04-24 15:41:20 -05:00
parent 61e713bdca
commit 6ade99ec61
2 changed files with 1 additions and 1 deletions
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1
fs/proc/base.c
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@ -3274,7 +3274,6 @@ static const struct inode_operations proc_tgid_base_inode_operations = {
void proc_flush_pid(struct pid *pid)
{
proc_invalidate_siblings_dcache(&pid->inodes, &pid->lock);
put_pid(pid);
}
static struct dentry *proc_pid_instantiate(struct dentry * dentry,

1
kernel/exit.c
View file

@ -219,6 +219,7 @@ void release_task(struct task_struct *p)
write_unlock_irq(&tasklist_lock);
proc_flush_pid(thread_pid);
put_pid(thread_pid);
release_thread(p);
put_task_struct_rcu_user(p);