netdev - Re: [PATCH net] inet: fix possible request socket leak

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Date:	Mon, 10 Aug 2015 21:18:30 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net] inet: fix possible request socket leak

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 10 Aug 2015 15:07:34 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> In commit b357a364c57c9 ("inet: fix possible panic in
> reqsk_queue_unlink()"), I missed fact that tcp_check_req()
> can return the listener socket in one case, and that we must
> release the request socket refcount or we leak it.
> 
> Tested:
> 
>  Following packetdrill test template shows the issue
> 
> 0     socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
> +0    setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
> +0    bind(3, ..., ...) = 0
> +0    listen(3, 1) = 0
> 
> +0    < S 0:0(0) win 2920 <mss 1460,sackOK,nop,nop>
> +0    > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK>
> +.002 < . 1:1(0) ack 21 win 2920
> +0    > R 21:21(0)
> 
> Fixes: b357a364c57c9 ("inet: fix possible panic in reqsk_queue_unlink()")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied and queued up for -stable, thanks.
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