netdev - Re: [PATCHv2 net] sctp: sctp should release assoc when sctp_make_abort_user return NULL in sctp

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Date:	Wed, 30 Dec 2015 16:58:03 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	lucien.xin@...il.com
Cc:	netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
	marcelo.leitner@...il.com, vyasevic@...hat.com,
	daniel@...earbox.net
Subject: Re: [PATCHv2 net] sctp: sctp should release assoc when
 sctp_make_abort_user return NULL in sctp_close

From: Xin Long <lucien.xin@...il.com>
Date: Tue, 29 Dec 2015 17:49:25 +0800

> In sctp_close, sctp_make_abort_user may return NULL because of memory
> allocation failure. If this happens, it will bypass any state change
> and never free the assoc. The assoc has no chance to be freed and it
> will be kept in memory with the state it had even after the socket is
> closed by sctp_close().
> 
> So if sctp_make_abort_user fails to allocate memory, we should abort
> the asoc via sctp_primitive_ABORT as well. Just like the annotation in
> sctp_sf_cookie_wait_prm_abort and sctp_sf_do_9_1_prm_abort said,
> "Even if we can't send the ABORT due to low memory delete the TCB.
> This is a departure from our typical NOMEM handling".
> 
> But then the chunk is NULL (low memory) and the SCTP_CMD_REPLY cmd would
> dereference the chunk pointer, and system crash. So we should add
> SCTP_CMD_REPLY cmd only when the chunk is not NULL, just like other
> places where it adds SCTP_CMD_REPLY cmd.
> 
> Signed-off-by: Xin Long <lucien.xin@...il.com>
> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>

Applied and queued up for -stable, thanks.
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