diff options
| -rw-r--r-- | kernel/signal.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index 64737c72dad..9b6fda5e87f 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -1102,18 +1102,19 @@ int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p) retry: ret = check_kill_permission(sig, info, p); - if (!ret && sig && (sp = p->sighand)) { - if (!get_task_struct_rcu(p)) - return -ESRCH; + if (!ret && sig && (sp = rcu_dereference(p->sighand))) { spin_lock_irqsave(&sp->siglock, flags); if (p->sighand != sp) { spin_unlock_irqrestore(&sp->siglock, flags); - put_task_struct(p); goto retry; } + if ((atomic_read(&sp->count) == 0) || + (atomic_read(&p->usage) == 0)) { + spin_unlock_irqrestore(&sp->siglock, flags); + return -ESRCH; + } ret = __group_send_sig_info(sig, info, p); spin_unlock_irqrestore(&sp->siglock, flags); - put_task_struct(p); } return ret; |