netdev - Re: [Bugme-new] [Bug 8342] New: sctp_getsockopt_local_addrs_old() calls copy_to

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Date:	Fri, 20 Apr 2007 14:35:00 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	netdev@...r.kernel.org
Cc:	"bugme-daemon@...nel-bugs.osdl.org" 
	<bugme-daemon@...zilla.kernel.org>, matthias.kaehlcke@...il.com,
	lksctp-developers@...ts.sourceforge.net
Subject: Re: [Bugme-new] [Bug 8342] New: sctp_getsockopt_local_addrs_old()
 calls copy_to_user() while a spinlock is held

On Mon, 16 Apr 2007 14:34:22 -0700
bugme-daemon@...zilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=8342
> 
>            Summary: sctp_getsockopt_local_addrs_old() calls copy_to_user()
>                     while a spinlock is held
>     Kernel Version: 2.6.20
>             Status: NEW
>           Severity: normal
>              Owner: acme@...stprotocols.net
>          Submitter: matthias.kaehlcke@...il.com
> 
> 
> Problem Description:
> 
> sctp_getsockopt_local_addrs_old() in net/sctp/socket.c calls copy_to_user()
> while the spinlock addr_lock is held. this should not be done as copy_to_user()
> might sleep. the call to sctp_copy_laddrs_to_user() while holding the lock is
> also problematic as it calls copy_to_user()
> 

yup.
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