netdev - Re: [PATCH net] ipv4: convert fib_num_tclassid_users to atomic

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Date:   Wed, 1 Dec 2021 19:42:17 -0700
From:   David Ahern <dsahern@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        David Ahern <dsahern@...nel.org>
Subject: Re: [PATCH net] ipv4: convert fib_num_tclassid_users to atomic_t

On 12/1/21 7:26 PM, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> Before commit faa041a40b9f ("ipv4: Create cleanup helper for fib_nh")
> changes to net->ipv4.fib_num_tclassid_users were protected by RTNL.
> 
> After the change, this is no longer the case, as free_fib_info_rcu()
> runs after rcu grace period, without rtnl being held.
> 
> Fixes: faa041a40b9f ("ipv4: Create cleanup helper for fib_nh")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: David Ahern <dsahern@...nel.org>
> ---
>  include/net/ip_fib.h     | 2 +-
>  include/net/netns/ipv4.h | 2 +-
>  net/ipv4/fib_frontend.c  | 2 +-
>  net/ipv4/fib_rules.c     | 4 ++--
>  net/ipv4/fib_semantics.c | 4 ++--
>  5 files changed, 7 insertions(+), 7 deletions(-)
> 

Thanks, Eric. Was this found by syzbot or code inspection?

Reviewed-by: David Ahern <dsahern@...nel.org>