linux-kernel - Re: [PATCH] drm/rockchip: Use struct_size() in devm

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Message-ID: <2639880.ggikvLCEDc@phil>
Date:   Wed, 29 Aug 2018 13:41:50 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Sandy Huang <hjc@...k-chips.com>, David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] drm/rockchip: Use struct_size() in devm_kzalloc()

Am Sonntag, 26. August 2018, 20:47:12 CEST schrieb Gustavo A. R. Silva:
> One of the more common cases of allocation size calculations is finding
> the size of a structure that has a zero-sized array at the end, along
> with memory for some number of elements for that array. For example:
> 
> struct foo {
> 	int stuff;
>         void *entry[];
> };
> 
> instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);
> 
> or, like in this particular case:
> 
> size = sizeof(struct foo) + sizeof(void *) * count;
> instance = devm_kzalloc(dev, size, GFP_KERNEL);
> 
> Instead of leaving these open-coded and prone to type mistakes, we can
> now use the new struct_size() helper:
> 
> instance = devm_kzalloc(dev, struct_size(instance, entry, count),
> GFP_KERNEL);
> 
> This issue was detected with the help of Coccinelle.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

applied to drm-misc with Kees' Review

Thanks
Heiko