netdev - Re: [PATCH] net: fix a potential rcu_read_lock() imbalance in rt6_fill

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Date:	Tue, 27 Mar 2012 13:25:51 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Ben Greear <greearb@...delatech.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Dave Jones <davej@...hat.com>
Subject: Re: [PATCH] net: fix a potential rcu_read_lock() imbalance in
 rt6_fill_node()

On Tue, Mar 27, 2012 at 01:17:09PM -0700, Ben Greear wrote:
> On 03/27/2012 12:53 PM, Eric Dumazet wrote:
> >Commit f2c31e32b378 (net: fix NULL dereferences in check_peer_redir() )
> >added a regression in rt6_fill_node(), leading to rcu_read_lock()
> >imbalance.
> >
> >Thats because NLA_PUT() can make a jump to nla_put_failure label.
> >
> >Fix this by using nla_put()
> >
> >Many thanks to Ben Greear for his help
> >
> >Reported-by: Ben Greear<greearb@...delatech.com>
> >Reported-by: Dave Jones<davej@...hat.com>
> >Signed-off-by: Eric Dumazet<eric.dumazet@...il.com>
> 
> This does indeed fix the problem for me (tested in the 3.0.25 kernel).
> So, please feel free to add:
> 
> Tested-by: Ben Greear <greearb@...delatech.com>

Very nice job Eric, thanks for tracking this down.

greg k-h
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