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Message-ID: <15d52659-5a86-4601-be20-4662cac76c60@huawei.com>
Date: Wed, 2 Apr 2025 12:43:34 +0800
From: Wang Zhaolong <wangzhaolong1@...wei.com>
To: Kuniyuki Iwashima <kuniyu@...zon.com>
CC: <edumazet@...gle.com>, <ematsumiya@...e.de>,
<linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<netdev@...r.kernel.org>, <smfrench@...il.com>, <zhangchangzhong@...wei.com>
Subject: Re: Fwd: [PATCH][SMB3 client] fix TCP timers deadlock after rmmod
Hi.
sorry for the late response.
I tested this patch below and it works fine.
Best Regards,
Wang Zhaolong
>
> I verified the patch below fixed the null-ptr-deref in lockdep by
> preventing cifs from being unloaded while TCP sockets are alive.
>
> I'll post this officialy, and once this is merged and pulled into
> the cifs tree, I'll send a revert of e9f2517a3e18.
>
> ---8<---
> diff --git a/include/net/sock.h b/include/net/sock.h
> index 8daf1b3b12c6..e6515ef9116a 100644
> --- a/include/net/sock.h
> +++ b/include/net/sock.h
> @@ -547,6 +547,10 @@ struct sock {
> struct rcu_head sk_rcu;
> netns_tracker ns_tracker;
> struct xarray sk_user_frags;
> +
> +#if IS_ENABLED(CONFIG_PROVE_LOCKING) && IS_ENABLED(CONFIG_MODULES)
> + struct module *sk_owner;
> +#endif
> };
>
> struct sock_bh_locked {
> @@ -1583,6 +1587,16 @@ static inline void sk_mem_uncharge(struct sock *sk, int size)
> sk_mem_reclaim(sk);
> }
>
> +#if IS_ENABLED(CONFIG_PROVE_LOCKING) && IS_ENABLED(CONFIG_MODULES)
> +static inline void sk_set_owner(struct sock *sk, struct module *owner)
> +{
> + __module_get(owner);
> + sk->sk_owner = owner;
> +}
> +#else
> +#define sk_set_owner(sk, owner)
> +#endif
> +
> /*
> * Macro so as to not evaluate some arguments when
> * lockdep is not enabled.
> @@ -1592,6 +1606,7 @@ static inline void sk_mem_uncharge(struct sock *sk, int size)
> */
> #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \
> do { \
> + sk_set_owner(sk, THIS_MODULE); \
> sk->sk_lock.owned = 0; \
> init_waitqueue_head(&sk->sk_lock.wq); \
> spin_lock_init(&(sk)->sk_lock.slock); \
> diff --git a/net/core/sock.c b/net/core/sock.c
> index 323892066def..b54f12faad1c 100644
> --- a/net/core/sock.c
> +++ b/net/core/sock.c
> @@ -2324,6 +2324,12 @@ static void __sk_destruct(struct rcu_head *head)
> __netns_tracker_free(net, &sk->ns_tracker, false);
> net_passive_dec(net);
> }
> +
> +#if IS_ENABLED(CONFIG_PROVE_LOCKING) && IS_ENABLED(CONFIG_MODULES)
> + if (sk->sk_owner)
> + module_put(sk->sk_owner);
> +#endif
> +
> sk_prot_free(sk->sk_prot_creator, sk);
> }
>
> ---8<---
>
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