netdev - Re: [PATCH net] rds: Fix NULL pointer dereference in __rds_rdma

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Message-Id: <20171206.154503.335867422494464163.davem@davemloft.net>
Date:   Wed, 06 Dec 2017 15:45:03 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     Haakon.Bugge@...cle.com
Cc:     santosh.shilimkar@...cle.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, rds-devel@....oracle.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] rds: Fix NULL pointer dereference in __rds_rdma_map

From: Håkon Bugge <Haakon.Bugge@...cle.com>
Date: Wed,  6 Dec 2017 17:18:28 +0100

> This is a fix for syzkaller719569, where memory registration was
> attempted without any underlying transport being loaded.
> 
> Analysis of the case reveals that it is the setsockopt() RDS_GET_MR
> (2) and RDS_GET_MR_FOR_DEST (7) that are vulnerable.
> 
> Here is an example stack trace when the bug is hit:
 ...
> The fix is to check the existence of an underlying transport in
> __rds_rdma_map().
> 
> Signed-off-by: Håkon Bugge <haakon.bugge@...cle.com>
> Reported-by: syzbot <syzkaller@...glegroups.com>

Applied and queued up for -stable, thanks.