linux-kernel - Re: [PATCH] inet: fix ip_mc_drop

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Date:	Mon, 8 Nov 2010 23:20:49 -0500
From:	Miles Lane <miles.lane@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	David Miller <davem@...emloft.net>, paulmck@...ux.vnet.ibm.com,
	ilpo.jarvinen@...sinki.fi, LKML <linux-kernel@...r.kernel.org>,
	Len Brown <lenb@...nel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH] inet: fix ip_mc_drop_socket()

Looks good here.

On Mon, Nov 8, 2010 at 4:15 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Hmm, I believe I found the bug.
>
> Thanks guys !
>
> [PATCH] inet: fix ip_mc_drop_socket()
>
> commit 8723e1b4ad9be4444 (inet: RCU changes in inetdev_by_index())
> forgot one call site in ip_mc_drop_socket()
>
> We should not decrease idev refcount after inetdev_by_index() call,
> since refcount is not increased anymore.
>
> Reported-by: Markus Trippelsdorf <markus@...ppelsdorf.de>
> Reported-by: Miles Lane <miles.lane@...il.com>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> ---
>  net/ipv4/igmp.c |    4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
> index c8877c6..3c53c2d 100644
> --- a/net/ipv4/igmp.c
> +++ b/net/ipv4/igmp.c
> @@ -2306,10 +2306,8 @@ void ip_mc_drop_socket(struct sock *sk)
>
>                in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
>                (void) ip_mc_leave_src(sk, iml, in_dev);
> -               if (in_dev != NULL) {
> +               if (in_dev != NULL)
>                        ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
> -                       in_dev_put(in_dev);
> -               }
>                /* decrease mem now to avoid the memleak warning */
>                atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
>                call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
>
>
>
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