Messages in this thread Patch in this message | | | Date | Tue, 8 Jan 2019 09:28:16 -0600 | From | "Gustavo A. R. Silva" <> | Subject | [PATCH] Input: tca6416-keypad: use struct_size() in 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 = 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);
This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> --- drivers/input/keyboard/tca6416-keypad.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/input/keyboard/tca6416-keypad.c b/drivers/input/keyboard/tca6416-keypad.c index dc983ab6c0ad..cdeef180aead 100644 --- a/drivers/input/keyboard/tca6416-keypad.c +++ b/drivers/input/keyboard/tca6416-keypad.c @@ -219,9 +219,7 @@ static int tca6416_keypad_probe(struct i2c_client *client, return -EINVAL; } - chip = kzalloc(sizeof(struct tca6416_keypad_chip) + - pdata->nbuttons * sizeof(struct tca6416_button), - GFP_KERNEL); + chip = kzalloc(struct_size(chip, buttons, pdata->nbuttons), GFP_KERNEL); input = input_allocate_device(); if (!chip || !input) { error = -ENOMEM; -- 2.20.1
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