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tty: audit: Take siglock directly 

lock_task_sighand() is for situations where the struct task_struct*
may disappear while trying to deref the sighand; this never applies
to 'current'.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2016-01-09 22:55:29 -08:00 committed by Greg Kroah-Hartman
parent a75c9b0912
commit f229c2c161
1 changed files with 5 additions and 8 deletions
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13
drivers/tty/tty_audit.c
View File

@ -180,22 +180,19 @@ void tty_audit_tiocsti(struct tty_struct *tty, char ch)
int tty_audit_push_current(void)
{
struct tty_audit_buf *buf = ERR_PTR(-EPERM);
struct task_struct *tsk = current;
unsigned long flags;
if (!lock_task_sighand(tsk, &flags))
return -ESRCH;
if (tsk->signal->audit_tty) {
buf = tsk->signal->tty_audit_buf;
spin_lock_irqsave(&current->sighand->siglock, flags);
if (current->signal->audit_tty) {
buf = current->signal->tty_audit_buf;
if (buf)
atomic_inc(&buf->count);
}
unlock_task_sighand(tsk, &flags);
spin_unlock_irqrestore(&current->sighand->siglock, flags);
/*
* Return 0 when signal->audit_tty set
* but tsk->signal->tty_audit_buf == NULL.
* but current->signal->tty_audit_buf == NULL.
*/
if (!buf || IS_ERR(buf))
return PTR_ERR(buf);