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-rw-r--r--kernel/ptrace.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 2dc00298e678..fdb34e86f923 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;