linux-kernel - Re: [PATCH rdma-next v3 2/3] lib/scatterlist: Fix wrong update of orig

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 23 Aug 2021 09:45:41 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Maor Gottlieb <maorg@...dia.com>
Cc:     Leon Romanovsky <leon@...nel.org>,
        Doug Ledford <dledford@...hat.com>,
        Christoph Hellwig <hch@...radead.org>,
        Ariel Elior <aelior@...vell.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Michal Kalderon <mkalderon@...vell.com>,
        Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>,
        Mustafa Ismail <mustafa.ismail@...el.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Roland Scheidegger <sroland@...are.com>,
        Shiraz Saleem <shiraz.saleem@...el.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        VMware Graphics <linux-graphics-maintainer@...are.com>,
        Weihang Li <liweihang@...wei.com>,
        Wenpeng Liang <liangwenpeng@...wei.com>,
        Yishai Hadas <yishaih@...dia.com>,
        Zack Rusin <zackr@...are.com>,
        Zhu Yanjun <zyjzyj2000@...il.com>
Subject: Re: [PATCH rdma-next v3 2/3] lib/scatterlist: Fix wrong update of
 orig_nents

On Mon, Aug 23, 2021 at 02:09:37PM +0300, Maor Gottlieb wrote:
> 
> On 8/20/2021 6:54 PM, Jason Gunthorpe wrote:
> > On Thu, Jul 29, 2021 at 12:39:12PM +0300, Leon Romanovsky wrote:
> > 
> > > +/**
> > > + * __sg_free_table - Free a previously mapped sg table
> > > + * @table:	The sg table header to use
> > > + * @max_ents:	The maximum number of entries per single scatterlist
> > > + * @total_ents:	The total number of entries in the table
> > > + * @nents_first_chunk: Number of entries int the (preallocated) first
> > > + *                     scatterlist chunk, 0 means no such preallocated
> > > + *                     first chunk
> > > + * @free_fn:	Free function
> > > + *
> > > + *  Description:
> > > + *    Free an sg table previously allocated and setup with
> > > + *    __sg_alloc_table().  The @max_ents value must be identical to
> > > + *    that previously used with __sg_alloc_table().
> > > + *
> > > + **/
> > > +void __sg_free_table(struct sg_table *table, unsigned int max_ents,
> > > +		     unsigned int nents_first_chunk, sg_free_fn *free_fn)
> > > +{
> > > +	sg_free_table_entries(table, max_ents, nents_first_chunk, free_fn,
> > > +			      table->orig_nents);
> > > +}
> > >   EXPORT_SYMBOL(__sg_free_table);
> > This is getting a bit indirect, there is only one caller of
> > __sg_free_table() in sg_pool.c, so may as well just export
> > sg_free_table_entries have have it use that directly.
> 
> So I can just extend __sg_free_table to get number of entries. What do you
> think?

Isn't the point here that different paths to __sg_free_table require
different entries? What do you mean?

Jason