netdev - Re: [PATCH net 1/1] tipc: correctly unlink packets from deferred packet queue

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Date:	Tue, 07 Jan 2014 16:17:10 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	jon.maloy@...csson.com
Cc:	netdev@...r.kernel.org, paul.gortmaker@...driver.com,
	erik.hugne@...csson.com, ying.xue@...driver.com, maloy@...jonn.com,
	tipc-discussion@...ts.sourceforge.net
Subject: Re: [PATCH net 1/1] tipc: correctly unlink packets from deferred
 packet queue

From: Jon Maloy <jon.maloy@...csson.com>
Date: Tue,  7 Jan 2014 15:51:36 -0500

> From: Erik Hugne <erik.hugne@...csson.com>
> 
> When we pull a received packet from a link's 'deferred packets' queue
> for processing, its 'next' pointer is not cleared, and still refers to
> the next packet in that queue, if any. This is incorrect, but caused
> no harm before commit 40ba3cdf542a469aaa9083fa041656e59b109b90 ("tipc:
> message reassembly using fragment chain") was introduced. After that
> commit, it may sometimes lead to the following oops:
 ...
> This happens when the last fragment of a message has passed through the
> the receiving link's 'deferred packets' queue, and at least one other
> packet was added to that queue while it was there. After the fragment
> chain with the complete message has been successfully delivered to the
> receiving socket, it is released. Since 'next' pointer of the last
> fragment in the released chain now is non-NULL, we get the crash shown
> above.
> 
> We fix this by clearing the 'next' pointer of all received packets,
> including those being pulled from the 'deferred' queue, before they
> undergo any further processing.
> 
> Fixes: 40ba3cdf542a4 ("tipc: message reassembly using fragment chain")
> Signed-off-by: Erik Hugne <erik.hugne@...csson.com>
> Reported-by: Ying Xue <ying.xue@...driver.com>
> Reviewed-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> Signed-off-by: Jon Maloy <jon.maloy@...csson.com>

Applied and queued up for -stable, thanks.
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