Now that we have pidfs_{get,register}_pid() that needs to be paired with
pidfs_put_pid() it's possible that someone pairs them with put_pid().
Thus freeing struct pid while it's still used by pidfs. Notice when that
happens. I'll also add a scheme to detect invalid uses of
pidfs_get_pid() and pidfs_put_pid() later.
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
---
kernel/pid.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/pid.c b/kernel/pid.c
index 26f1e136f017..8317bcbc7cf7 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -100,6 +100,7 @@ void put_pid(struct pid *pid)
ns = pid->numbers[pid->level].ns;
if (refcount_dec_and_test(&pid->count)) {
+ WARN_ON_ONCE(pid->stashed);
kmem_cache_free(ns->pid_cachep, pid);
put_pid_ns(ns);
}
--
2.47.2
