1 files changed, 3 insertions, 1 deletions

diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c
index ffda91a4a1aa..02514fe558b4 100644
--- a/security/yama/yama_lsm.c
+++ b/security/yama/yama_lsm.c
@@ -368,7 +368,9 @@ static int yama_ptrace_access_check(struct task_struct *child,
                         break;
                 case YAMA_SCOPE_RELATIONAL:
                         rcu_read_lock();
-                        if (!task_is_descendant(current, child) &&
+                        if (!pid_alive(child))
+                                rc = -EPERM;
+                        if (!rc && !task_is_descendant(current, child) &&
                             !ptracer_exception_found(current, child) &&
                             !ns_capable(__task_cred(child)->user_ns, CAP_SYS_PTRACE))
                                 rc = -EPERM;