linux-kernel - Re: [PATCH] mm: dmapool: Check the dma pool name

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Message-ID: <20180530151327.GA13951@bombadil.infradead.org>
Date:   Wed, 30 May 2018 08:13:27 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>, Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH] mm: dmapool: Check the dma pool name

On Wed, May 30, 2018 at 08:14:09PM +0800, Baolin Wang wrote:
> On 30 May 2018 at 20:01, Matthew Wilcox <willy@...radead.org> wrote:
> > On Wed, May 30, 2018 at 07:28:43PM +0800, Baolin Wang wrote:
> >> It will be crash if we pass one NULL name when creating one dma pool,
> >> so we should check the passing name when copy it to dma pool.
> >
> > NAK.  Crashing is the appropriate thing to do.  Fix the caller to not
> > pass NULL.
> >
> > If you permit NULL to be passed then you're inviting crashes or just
> > bad reporting later when pool->name is printed.
> 
> I think it just prints one NULL pool name. Sometimes the device
> doesn't care the dma pool names, so I think we can make code more
> solid to valid the passing parameters like other code does.
> Or can we add check to return NULL when the passing name is NULL
> instead of crashing the kernel? Thanks.

No.  Fix your driver.