netdev - Re: [Lksctp-developers] [PATCH] SCTP: Fix kernel panic while received AUTH chunk with BAD shared key identifier

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Date:	Thu, 24 Jan 2008 07:16:08 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	Wei Yongjun <yjwei@...fujitsu.com>
Cc:	netdev@...r.kernel.org, Vlad Yasevich <vladislav.yasevich@...com>,
	lksctp-developers@...ts.sourceforge.net
Subject: Re: [Lksctp-developers] [PATCH] SCTP: Fix kernel panic while
	received AUTH chunk with BAD shared key identifier

On Tue, Jan 22, 2008 at 05:29:20PM +0900, Wei Yongjun wrote:
> 
> 
> This patch fix this problem.
> 
> Signed-off-by: Wei Yongjun <yjwei@...fujitsu.com>
> 
> --- a/net/sctp/auth.c	2008-01-21 00:03:25.000000000 -0500
> +++ b/net/sctp/auth.c	2008-01-21 21:31:47.000000000 -0500
> @@ -420,15 +420,15 @@ struct sctp_shared_key *sctp_auth_get_sh
>  				const struct sctp_association *asoc,
>  				__u16 key_id)
>  {
> -	struct sctp_shared_key *key = NULL;
> +	struct sctp_shared_key *key;
>  
>  	/* First search associations set of endpoint pair shared keys */
>  	key_for_each(key, &asoc->endpoint_shared_keys) {
>  		if (key->key_id == key_id)
> -			break;
> +			return key;
>  	}
>  
> -	return key;
> +	return NULL;
>  }
>  
>  /*
> 

FWIW, Ack from me.  The assignment of NULL to key can safely be removed, since
key_for_each (which is just list_for_each_entry under the covers does an initial
assignment to key anyway). 

If the endpoint_shared_keys list is empty, or if the key_id being requested does
not exist, the function as it currently stands returns the actuall list_head (in
this case endpoint_shared_keys.  Since that list_head isn't surrounded by an
actuall data structure, the last iteration through list_for_each_entry will do a
container_of on key, and we wind up returning a bogus pointer, instead of NULL,
as we should.  Wei's patch corrects that.

Regards
Neil

Acked-by: Neil Horman <nhorman@...driver.com>

> 
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