netdev - Re: [PATCH net] af_key: do not use GFP

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Date:   Mon, 14 Aug 2017 17:07:27 -0600
From:   David Ahern <dsahern@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        David Miller <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        David Ahern <dsa@...ulusnetworks.com>
Subject: Re: [PATCH net] af_key: do not use GFP_KERNEL in atomic contexts

On 8/14/17 11:16 AM, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> pfkey_broadcast() might be called from non process contexts,
> we can not use GFP_KERNEL in these cases [1].
> 
> This patch partially reverts commit ba51b6be38c1 ("net: Fix RCU splat in
> af_key"), only keeping the GFP_ATOMIC forcing under rcu_read_lock()
> section.
> 
> [1] : syzkaller reported :
...
> Fixes: ba51b6be38c1 ("net: Fix RCU splat in af_key")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: David Ahern <dsa@...ulusnetworks.com>
> ---
>  net/key/af_key.c |   48 ++++++++++++++++++++++++---------------------
>  1 file changed, 26 insertions(+), 22 deletions(-)
> 

Thanks for the fix, Eric.

Acked-by: David Ahern <dsahern@...il.com>