netdev - Re: [PATCH v1 net 2/2] ping: Fix potentail NULL deref for /proc/net/icmp.

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Date:   Tue, 4 Apr 2023 03:47:34 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Kuniyuki Iwashima <kuniyu@...zon.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v1 net 2/2] ping: Fix potentail NULL deref for /proc/net/icmp.

On Mon, Apr 3, 2023 at 9:51 PM Kuniyuki Iwashima <kuniyu@...zon.com> wrote:
>
> After commit dbca1596bbb0 ("ping: convert to RCU lookups, get rid
> of rwlock"), we use RCU for ping sockets, but we should use spinlock
> for /proc/net/icmp to avoid a potential NULL deref mentioned in
> the previous patch.
>
> Let's go back to using spinlock there.
>
> Note we can convert ping sockets to use hlist instead of hlist_nulls
> because we do not use SLAB_TYPESAFE_BY_RCU for ping sockets.

Yes, this could be done later if we care enough.

>
> Fixes: dbca1596bbb0 ("ping: convert to RCU lookups, get rid of rwlock")
> Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
> ---

Reviewed-by: Eric Dumazet <edumazet@...gle.com>

Thanks !