netdev - Re: [PATCH 1/1] r8152: fix NULL pointer dereference in r8152

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Date:   Mon, 13 Mar 2017 16:37:46 +0100
From:   Petr Vorel <petr.vorel@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     netdev@...r.kernel.org, hayeswang@...ltek.com, davem@...emloft.net
Subject: Re: [PATCH 1/1] r8152: fix NULL pointer dereference in r8152_poll

Hi Eric,

> > The proper work around is to enclose the napi_schedule() in a
> > local_bh_enable()/local_bh_disable()  pair.

> Something like :
> --- a/drivers/net/usb/r8152.c
> +++ b/drivers/net/usb/r8152.c
> @@ -3703,8 +3703,10 @@ static int rtl8152_resume(struct usb_interface *intf)
>  			napi_enable(&tp->napi);
>  			clear_bit(SELECTIVE_SUSPEND, &tp->flags);
>  			smp_mb__after_atomic();
> +			local_bh_disable();
>  			if (!list_empty(&tp->rx_done))
>  				napi_schedule(&tp->napi);
> +			local_bh_enable();

Unfortunately this doesn't work. Code in r8152.c doesn't use local_bh_enable()/local_bh_disable(). I tried to lock it with spin_lock_bh()/spin_unlock_bh() and with mutex_lock()/mutex_unlock() but neither work.


Kind regards,
Petr