linux-kernel - Re: [PATCH] drm/i915: Fix a crash in shmem_pin

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Message-ID: <20201024134752.GF18329@kadam>
Date:   Sat, 24 Oct 2020 16:47:52 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Auld <matthew.auld@...el.com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] drm/i915: Fix a crash in shmem_pin_map() error handling

On Fri, Oct 23, 2020 at 02:19:41PM +0200, Christoph Hellwig wrote:
> > diff --git a/drivers/gpu/drm/i915/gt/shmem_utils.c b/drivers/gpu/drm/i915/gt/shmem_utils.c
> > index f011ea42487e..7eb542018219 100644
> > --- a/drivers/gpu/drm/i915/gt/shmem_utils.c
> > +++ b/drivers/gpu/drm/i915/gt/shmem_utils.c
> > @@ -52,8 +52,9 @@ struct file *shmem_create_from_object(struct drm_i915_gem_object *obj)
> >  void *shmem_pin_map(struct file *file)
> >  {
> >  	struct page **pages;
> > -	size_t n_pages, i;
> > +	size_t n_pages;
> >  	void *vaddr;
> > +	int i;
> >  
> >  	n_pages = file->f_mapping->host->i_size >> PAGE_SHIFT;
> >  	pages = kvmalloc_array(n_pages, sizeof(*pages), GFP_KERNEL);
> 
> This assumes we never have more than INT_MAX worth of pages before
> a failure. 

Doh.  Yeah.  My bad.

regards,
dan carpenter