linux-kernel - RE: [PATCH v5] cifs: Allocate validate negotiation request through kmalloc

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Message-ID: <MWHPR2101MB08097B137B0C9CCEC2E902BDA08E0@MWHPR2101MB0809.namprd21.prod.outlook.com>
Date:   Thu, 26 Apr 2018 18:45:53 +0000
From:   Tom Talpey <ttalpey@...rosoft.com>
To:     Long Li <longli@...rosoft.com>, Steve French <sfrench@...ba.org>,
        "linux-cifs@...r.kernel.org" <linux-cifs@...r.kernel.org>,
        "samba-technical@...ts.samba.org" <samba-technical@...ts.samba.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: RE: [PATCH v5] cifs: Allocate validate negotiation request through
 kmalloc

> -----Original Message-----
> From: linux-cifs-owner@...r.kernel.org <linux-cifs-owner@...r.kernel.org> On
> Behalf Of Long Li
> Sent: Wednesday, April 25, 2018 2:30 PM
> To: Steve French <sfrench@...ba.org>; linux-cifs@...r.kernel.org; samba-
> technical@...ts.samba.org; linux-kernel@...r.kernel.org; linux-
> rdma@...r.kernel.org
> Cc: Long Li <longli@...rosoft.com>
> Subject: [PATCH v5] cifs: Allocate validate negotiation request through kmalloc
> 
> From: Long Li <longli@...rosoft.com>
> 
> The data buffer allocated on the stack can't be DMA'ed, ib_dma_map_page will
> return an invalid DMA address for a buffer on stack. Even worse, this
> incorrect address can't be detected by ib_dma_mapping_error. Sending data
> from this address to hardware will not fail, but the remote peer will get
> junk data.
> 
> Fix this by allocating the request on the heap in smb3_validate_negotiate.
> 

Looks good.

Reviewed-By: Tom Talpey <ttalpey@...rosoft.com>