diff options
| -rw-r--r-- | kernel/ptrace.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c index 2dc00298e67..fdb34e86f92 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -99,9 +99,12 @@ int ptrace_check_attach(struct task_struct *child, int kill) * be changed by us so it's not changing right after this. */ read_lock(&tasklist_lock); - if ((child->ptrace & PT_PTRACED) && child->parent == current && - child->signal != NULL) { + if ((child->ptrace & PT_PTRACED) && child->parent == current) { ret = 0; + /* + * child->sighand can't be NULL, release_task() + * does ptrace_unlink() before __exit_signal(). + */ spin_lock_irq(&child->sighand->siglock); if (task_is_stopped(child)) child->state = TASK_TRACED; |