linux-kernel - Re: [PATCH] rds: prevent dereference of a NULL device in rds_iw_laddr

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Date:	Sat, 21 Dec 2013 03:31:07 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Sasha Levin <sasha.levin@...cle.com>,
	venkat.x.venkatsubra@...cle.com, davem@...emloft.net
CC:	rds-devel@....oracle.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rds: prevent dereference of a NULL device in rds_iw_laddr_check

Hello.

On 12/21/2013 02:18 AM, Sasha Levin wrote:

> Binding might result in a NULL device which is later dereferenced
> without checking.

> Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
> ---
>   net/rds/iw.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)

> diff --git a/net/rds/iw.c b/net/rds/iw.c
> index 7826d46..0298920 100644
> --- a/net/rds/iw.c
> +++ b/net/rds/iw.c
> @@ -239,7 +239,8 @@ static int rds_iw_laddr_check(__be32 addr)
>   	ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
>   	/* due to this, we will claim to support IB devices unless we
>   	   check node_type. */
> -	if (ret || cm_id->device->node_type != RDMA_NODE_RNIC)
> +	if (ret || !cm_id->device ||
> +            cm_id->device->node_type != RDMA_NODE_RNIC)

    Indent with tabs and then spaces, not with spaces only please, so that the 
line aligns under 'ret'.

WBR, Sergei

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