linux-kernel - Re: [PATCH] drm/i915: Fix memory leaks in i915 selftests

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Date:   Thu, 13 Apr 2023 10:15:10 +0200
From:   Andi Shyti <andi.shyti@...ux.intel.com>
To:     Cong Liu <liucong2@...inos.cn>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthew Auld <matthew.auld@...el.com>,
        Andi Shyti <andi.shyti@...ux.intel.com>,
        Nirmoy Das <nirmoy.das@...el.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Matthew Brost <matthew.brost@...el.com>,
        Jonathan Cavitt <jonathan.cavitt@...el.com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Gwan-gyeong Mun <gwan-gyeong.mun@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i915: Fix memory leaks in i915 selftests

Hi Cong,

> Fixes: c3bfba9a2225 ("drm/i915: Check for integer truncation on scatterlist creation")
> 
> Signed-off-by: Cong Liu <liucong2@...inos.cn>

As Jani suggested we need a commit message here. Would something
like this work for you?

"
We forget to free 'pages' after checking for overflow. Be sure to
properly free the allocated memory before exiting the
fake_free_pages() function.
"

If it's OK for you, then I can add this message and fix the blank
space before pushing this patch.

In any case:

Reviewed-by: Andi Shyti <andi.shyti@...ux.intel.com> 

Andi

> ---
>  drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> index 5361ce70d3f2..154801f1c468 100644
> --- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
> @@ -69,8 +69,10 @@ static int fake_get_pages(struct drm_i915_gem_object *obj)
>  
>  	rem = round_up(obj->base.size, BIT(31)) >> 31;
>  	/* restricted by sg_alloc_table */
> -	if (overflows_type(rem, unsigned int))
> +	if (overflows_type(rem, unsigned int)) {
> +		kfree(pages);
>  		return -E2BIG;
> +	}
>  
>  	if (sg_alloc_table(pages, rem, GFP)) {
>  		kfree(pages);
> -- 
> 2.34.1
> 
> 
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