diff options
| -rw-r--r-- | fs/exec.c | 24 |
1 files changed, 9 insertions, 15 deletions
diff --git a/fs/exec.c b/fs/exec.c index 7f325df5e01..c6e91c3dc2a 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -747,7 +747,7 @@ static int exec_mmap(struct mm_struct *mm) static int de_thread(struct task_struct *tsk) { struct signal_struct *sig = tsk->signal; - struct sighand_struct *newsighand, *oldsighand = tsk->sighand; + struct sighand_struct *oldsighand = tsk->sighand; spinlock_t *lock = &oldsighand->siglock; struct task_struct *leader = NULL; int count; @@ -761,10 +761,6 @@ static int de_thread(struct task_struct *tsk) return 0; } - newsighand = kmem_cache_alloc(sighand_cachep, GFP_KERNEL); - if (!newsighand) - return -ENOMEM; - if (thread_group_empty(tsk)) goto no_thread_group; @@ -781,7 +777,6 @@ static int de_thread(struct task_struct *tsk) */ spin_unlock_irq(lock); read_unlock(&tasklist_lock); - kmem_cache_free(sighand_cachep, newsighand); return -EAGAIN; } @@ -899,17 +894,16 @@ no_thread_group: if (leader) release_task(leader); - if (atomic_read(&oldsighand->count) == 1) { - /* - * Now that we nuked the rest of the thread group, - * it turns out we are not sharing sighand any more either. - * So we can just keep it. - */ - kmem_cache_free(sighand_cachep, newsighand); - } else { + if (atomic_read(&oldsighand->count) != 1) { + struct sighand_struct *newsighand; /* - * Move our state over to newsighand and switch it in. + * This ->sighand is shared with the CLONE_SIGHAND + * but not CLONE_THREAD task, switch to the new one. */ + newsighand = kmem_cache_alloc(sighand_cachep, GFP_KERNEL); + if (!newsighand) + return -ENOMEM; + atomic_set(&newsighand->count, 1); memcpy(newsighand->action, oldsighand->action, sizeof(newsighand->action)); |