linux-kernel - Re: [PATCH] net: ipv6: route: Fix a sleep-in-atomic-context bug in ip6_convert

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Message-ID: <4cbf0c0c-ec8b-d953-8ff8-c5cab4d10441@gmail.com>
Date:   Sat, 1 Sep 2018 22:25:55 -0600
From:   David Ahern <dsahern@...il.com>
To:     Jia-Ju Bai <baijiaju1990@...il.com>, davem@...emloft.net,
        kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ipv6: route: Fix a sleep-in-atomic-context bug in
 ip6_convert_metrics()

On 9/1/18 5:19 AM, Jia-Ju Bai wrote:
> The kernel module may sleep with holding a spinlock.
...

> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> index ec18b3ce8b6d..d15e72def7c1 100644
> --- a/net/ipv6/route.c
> +++ b/net/ipv6/route.c
> @@ -2742,7 +2742,7 @@ static int ip6_convert_metrics(struct net *net, struct fib6_info *rt,
>  	if (!cfg->fc_mx)
>  		return 0;
>  
> -	p = kzalloc(sizeof(*rt->fib6_metrics), GFP_KERNEL);
> +	p = kzalloc(sizeof(*rt->fib6_metrics), GFP_ATOMIC);
>  	if (unlikely(!p))
>  		return -ENOMEM;
>  
> 

This is the wrong solution. I'll take care of it next week after the
holiday weekend.