netdev - RE: [PATCH net,v2] wifi: mac80211: fix general-protection-fault in ieee80211_subif_start

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Date:   Wed, 26 Oct 2022 05:46:00 +0000
From:   Ping-Ke Shih <pkshih@...ltek.com>
To:     Zhengchao Shao <shaozhengchao@...wei.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "johannes@...solutions.net" <johannes@...solutions.net>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>
CC:     "toke@...nel.org" <toke@...nel.org>,
        "alexander@...zel-home.de" <alexander@...zel-home.de>,
        "nbd@....name" <nbd@....name>,
        "weiyongjun1@...wei.com" <weiyongjun1@...wei.com>,
        "yuehaibing@...wei.com" <yuehaibing@...wei.com>
Subject: RE: [PATCH net,v2] wifi: mac80211: fix general-protection-fault in ieee80211_subif_start_xmit()



> -----Original Message-----
> From: Zhengchao Shao <shaozhengchao@...wei.com>
> Sent: Wednesday, October 26, 2022 10:47 AM
> To: linux-wireless@...r.kernel.org; netdev@...r.kernel.org; johannes@...solutions.net;
> davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com
> Cc: toke@...nel.org; alexander@...zel-home.de; nbd@....name; weiyongjun1@...wei.com;
> yuehaibing@...wei.com; shaozhengchao@...wei.com
> Subject: [PATCH net,v2] wifi: mac80211: fix general-protection-fault in ieee80211_subif_start_xmit()
> 
> When device is running and the interface status is changed, the gpf issue
> is triggered. The problem triggering process is as follows:
> Thread A:                           Thread B
> ieee80211_runtime_change_iftype()   process_one_work()
>     ...                                 ...
>     ieee80211_do_stop()                 ...
>     ...                                 ...
>         sdata->bss = NULL               ...
>         ...                             ieee80211_subif_start_xmit()
>                                             ieee80211_multicast_to_unicast
>                                     //!sdata->bss->multicast_to_unicast
>                                       cause gpf issue
> 
> When the interface status is changed, the sending queue continues to send
> packets. After the bss is set to NULL, the bss is accessed. As a result,
> this causes a general-protection-fault issue.
> 
> The following is the stack information:
> general protection fault, probably for non-canonical address
> 0xdffffc000000002f: 0000 [#1] PREEMPT SMP KASAN
> KASAN: null-ptr-deref in range [0x0000000000000178-0x000000000000017f]
> Workqueue: mld mld_ifc_work
> RIP: 0010:ieee80211_subif_start_xmit+0x25b/0x1310
> Call Trace:
> <TASK>
> dev_hard_start_xmit+0x1be/0x990
> __dev_queue_xmit+0x2c9a/0x3b60
> ip6_finish_output2+0xf92/0x1520
> ip6_finish_output+0x6af/0x11e0
> ip6_output+0x1ed/0x540
> mld_sendpack+0xa09/0xe70
> mld_ifc_work+0x71c/0xdb0
> process_one_work+0x9bf/0x1710
> worker_thread+0x665/0x1080
> kthread+0x2e4/0x3a0
> ret_from_fork+0x1f/0x30
> </TASK>
> 
> Fixes: f856373e2f31 ("wifi: mac80211: do not wake queues on a vif that is being stopped")
> Reported-by: syzbot+c6e8fca81c294fd5620a@...kaller.appspotmail.com
> Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
> ---
>  net/mac80211/tx.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
> index a364148149f9..c38485f39d2b 100644
> --- a/net/mac80211/tx.c
> +++ b/net/mac80211/tx.c
> @@ -4418,6 +4418,11 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
>  	if (likely(!is_multicast_ether_addr(eth->h_dest)))
>  		goto normal;
> 
> +	if (unlikely(!ieee80211_sdata_running(sdata))) {
> +                kfree_skb(skb);
> +                return NETDEV_TX_OK;
> +        }
> +

The indent looks odd. It seems like you use spaces instead of tabs?

>  	if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
>  		struct sk_buff_head queue;
> 
> --
> 2.17.1
> 
> 
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