netdev - Re: [PATCH v2] sctp: Fix sk_ack_backlog wrap-around problem

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Date:	Thu, 12 Jun 2014 10:38:14 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	xufeng.zhang@...driver.com
Cc:	vyasevich@...il.com, nhorman@...driver.com,
	linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] sctp: Fix sk_ack_backlog wrap-around problem

From: Xufeng Zhang <xufeng.zhang@...driver.com>
Date: Thu, 12 Jun 2014 10:53:36 +0800

> Consider the scenario:
> For a TCP-style socket, while processing the COOKIE_ECHO chunk in
> sctp_sf_do_5_1D_ce(), after it has passed a series of sanity check,
> a new association would be created in sctp_unpack_cookie(), but afterwards,
> some processing maybe failed, and sctp_association_free() will be called to
> free the previously allocated association, in sctp_association_free(),
> sk_ack_backlog value is decremented for this socket, since the initial
> value for sk_ack_backlog is 0, after the decrement, it will be 65535,
> a wrap-around problem happens, and if we want to establish new associations
> afterward in the same socket, ABORT would be triggered since sctp deem the
> accept queue as full.
> Fix this issue by only decrementing sk_ack_backlog for associations in
> the endpoint's list.
> 
> Fix-suggested-by: Neil Horman <nhorman@...driver.com>
> Signed-off-by: Xufeng Zhang <xufeng.zhang@...driver.com>
> ---
> Change for v2:
>   Drop the redundant test for temp suggested by Vlad Yasevich.

Applied and queued up for -stable, thanks.
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