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Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 

* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  posix-cpu-timers: Rcu_read_lock/unlock protect find_task_by_vpid call
This commit is contained in:
Linus Torvalds 2010-11-27 07:29:20 +09:00
parent fbe6c4047f c0deae8c95
commit 0318755276
1 changed files with 6 additions and 6 deletions
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12
kernel/posix-cpu-timers.c
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@ -37,13 +37,13 @@ static int check_clock(const clockid_t which_clock)
if (pid == 0)
return 0;
read_lock(&tasklist_lock);
rcu_read_lock();
p = find_task_by_vpid(pid);
if (!p || !(CPUCLOCK_PERTHREAD(which_clock) ?
same_thread_group(p, current) : thread_group_leader(p))) {
same_thread_group(p, current) : has_group_leader_pid(p))) {
error = -EINVAL;
}
read_unlock(&tasklist_lock);
rcu_read_unlock();
return error;
}
@ -390,7 +390,7 @@ int posix_cpu_timer_create(struct k_itimer *new_timer)
INIT_LIST_HEAD(&new_timer->it.cpu.entry);
read_lock(&tasklist_lock);
rcu_read_lock();
if (CPUCLOCK_PERTHREAD(new_timer->it_clock)) {
if (pid == 0) {
p = current;
@ -404,7 +404,7 @@ int posix_cpu_timer_create(struct k_itimer *new_timer)
p = current->group_leader;
} else {
p = find_task_by_vpid(pid);
if (p && !thread_group_leader(p))
if (p && !has_group_leader_pid(p))
p = NULL;
}
}
@ -414,7 +414,7 @@ int posix_cpu_timer_create(struct k_itimer *new_timer)
} else {
ret = -EINVAL;
}
read_unlock(&tasklist_lock);
rcu_read_unlock();
return ret;
}