linux-kernel - Re: [PATCH] scsi: sg: Prevent potential double frees in sg driver

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Date:   Thu, 3 Aug 2017 12:23:54 -0700
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     hare@...e.de, jthumshirn@...e.de, hch@....de, salyzyn@...gle.com,
        Robb Glasser <rglasser@...gle.com>,
        Doug Gilbert <dgilbert@...erlog.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: sg: Prevent potential double frees in sg driver

On Thu, Aug 03, 2017 at 12:02:47PM -0700, Nick Desaulniers wrote:
> From: Robb Glasser <rglasser@...gle.com>
> 
> sg_ioctl could be spammed by requests, leading to a double free in
> __free_pages. This protects the entry points of sg_ioctl where the
> memory could be corrupted by a double call to __free_pages if multiple
> requests are happening concurrently.
> 
> Signed-off-by: Robb Glasser <rglasser@...gle.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
>  drivers/scsi/sg.c | 2 ++
>  1 file changed, 2 insertions(+)

Why no one on the to: line?

And do you want this in the stable kernel trees?  If so, please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

thanks,

greg k-h