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drm/sun4i: tcon-top: Use struct_size() in devm_kzalloc()

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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);

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.

Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180824010521.GA25451@embeddedor.com
This commit is contained in:
Gustavo A. R. Silva 2018-08-23 20:05:21 -05:00 committed by Maxime Ripard
parent e296de926d
commit 06e3c29716
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GPG Key ID: D2B4C094214DAF74
1 changed files with 1 additions and 2 deletions
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drivers/gpu/drm/sun4i/sun8i_tcon_top.c
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@ -129,8 +129,7 @@ static int sun8i_tcon_top_bind(struct device *dev, struct device *master,
if (!tcon_top)
return -ENOMEM;
clk_data = devm_kzalloc(dev, sizeof(*clk_data) +
sizeof(*clk_data->hws) * CLK_NUM,
clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, CLK_NUM),
GFP_KERNEL);
if (!clk_data)
return -ENOMEM;