Andrew Morton wrote:
> On Mon, 16 Apr 2007 14:34:22 -0700
> bugme-daemon@bugzilla.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@ghostprotocols.net
>>          Submitter: matthias.kaehlcke@gmail.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.

Thanks for reporting.

The area of this particular lock is quite ugly and will need to be cleaned up.
In the mean time, here is a patch that fixes this for now.

-vlad