From a73450036e3222ffd1cb20fc4a88832bb17921b8 Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Sun, 13 Jan 2019 22:30:18 -0800 Subject: [PATCH] Input: mcs_touchkey - use struct_size() in kzalloc() 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 Signed-off-by: Dmitry Torokhov --- drivers/input/keyboard/mcs_touchkey.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/input/keyboard/mcs_touchkey.c b/drivers/input/keyboard/mcs_touchkey.c index be56d4f..b132662 100644 --- a/drivers/input/keyboard/mcs_touchkey.c +++ b/drivers/input/keyboard/mcs_touchkey.c @@ -113,9 +113,8 @@ static int mcs_touchkey_probe(struct i2c_client *client, return -EINVAL; } - data = kzalloc(sizeof(struct mcs_touchkey_data) + - sizeof(data->keycodes[0]) * (pdata->key_maxval + 1), - GFP_KERNEL); + data = kzalloc(struct_size(data, keycodes, pdata->key_maxval + 1), + GFP_KERNEL); input_dev = input_allocate_device(); if (!data || !input_dev) { dev_err(&client->dev, "Failed to allocate memory\n"); -- 2.7.4