linux-kernel - Re: [PATCH net] RDS: Check cmsg_len before dereferencing CMSG

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Message-Id: <20171227.103754.1156659391056933085.davem@davemloft.net>
Date:   Wed, 27 Dec 2017 10:37:54 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     avinash.repaka@...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: Check cmsg_len before dereferencing CMSG_DATA

From: Avinash Repaka <avinash.repaka@...cle.com>
Date: Thu, 21 Dec 2017 20:17:04 -0800

> RDS currently doesn't check if the length of the control message is
> large enough to hold the required data, before dereferencing the control
> message data. This results in following crash:
 ...
> To fix this, we verify that the cmsg_len is large enough to hold the
> data to be read, before proceeding further.
> 
> Reported-by: syzbot <syzkaller-bugs@...glegroups.com>
> Signed-off-by: Avinash Repaka <avinash.repaka@...cle.com>

Applied and queued up for -stable, thanks.