netdev - Re: [PATCH net] rds: MP-RDS may use an invalid c

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Message-ID: <0e71ed3a-25ad-7a4d-6712-ffa4ec955e0b@oracle.com>
Date:   Wed, 11 Apr 2018 07:00:42 -0700
From:   "santosh.shilimkar@...cle.com" <santosh.shilimkar@...cle.com>
To:     Ka-Cheong Poon <ka-cheong.poon@...cle.com>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, rds-devel@....oracle.com
Subject: Re: [PATCH net] rds: MP-RDS may use an invalid c_path

On 4/11/18 12:57 AM, Ka-Cheong Poon wrote:
> rds_sendmsg() calls rds_send_mprds_hash() to find a c_path to use to
> send a message.  Suppose the RDS connection is not yet up.  In
> rds_send_mprds_hash(), it does
> 
> 	if (conn->c_npaths == 0)
> 		wait_event_interruptible(conn->c_hs_waitq,
> 					 (conn->c_npaths != 0));
> 
> If it is interrupted before the connection is set up,
> rds_send_mprds_hash() will return a non-zero hash value.  Hence
> rds_sendmsg() will use a non-zero c_path to send the message.  But if
> the RDS connection ends up to be non-MP capable, the message will be
> lost as only the zero c_path can be used.
> 
> Signed-off-by: Ka-Cheong Poon <ka-cheong.poon@...cle.com>
> ---
Thanks for posting the fix upstream as well.

Acked-by: Santosh Shilimkar <santosh.shilimkar@...cle.com>