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clk: npcm7xx: fix memory allocation

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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 = kzalloc(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 = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);

Notice that, currently, there is a bug during the allocation:

sizeof(npcm7xx_clk_data) should be sizeof(*npcm7xx_clk_data)

Fix this bug by using struct_size() in kzalloc()

This issue was detected with the help of Coccinelle.

Cc: stable@vger.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Avi Fishman <avifishman70@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Gustavo A. R. Silva 2018-08-23 18:06:54 -05:00 committed by Stephen Boyd
parent 5b394b2ddf
commit 450b6b9b16
1 changed files with 2 additions and 2 deletions
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4
drivers/clk/clk-npcm7xx.c
View File

@ -558,8 +558,8 @@ static void __init npcm7xx_clk_init(struct device_node *clk_np)
if (!clk_base)
goto npcm7xx_init_error;
npcm7xx_clk_data = kzalloc(sizeof(*npcm7xx_clk_data->hws) *
NPCM7XX_NUM_CLOCKS + sizeof(npcm7xx_clk_data), GFP_KERNEL);
npcm7xx_clk_data = kzalloc(struct_size(npcm7xx_clk_data, hws,
NPCM7XX_NUM_CLOCKS), GFP_KERNEL);
if (!npcm7xx_clk_data)
goto npcm7xx_init_np_err;