netdev - Re: [PATCH net-next] rds: rds_msg_zcopy should return error of null rm->data.op_mmp

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Date:   Fri, 23 Feb 2018 12:32:04 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     sowmini.varadhan@...cle.com
Cc:     netdev@...r.kernel.org, santosh.shilimkar@...cle.com
Subject: Re: [PATCH net-next] rds: rds_msg_zcopy should return error of
 null rm->data.op_mmp_znotifier

From: Sowmini Varadhan <sowmini.varadhan@...cle.com>
Date: Thu, 22 Feb 2018 13:40:27 -0800

> if either or both of MSG_ZEROCOPY and SOCK_ZEROCOPY have not been
> specified, the rm->data.op_mmp_znotifier allocation will be skipped.
> In this case, it is invalid ot pass down a cmsghdr with
> RDS_CMSG_ZCOPY_COOKIE, so return EINVAL from rds_msg_zcopy for this
> case.
> 
> Reported-by: syzbot+f893ae7bb2f6456dfbc3@...kaller.appspotmail.com
> Fixes: 0cebaccef3ac ("rds: zerocopy Tx support.")
> Signed-off-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>

Applied, thank you.