| Message ID | 20190104213508.GA20333@embeddedor |
|---|---|
| State | New |
| Headers | show |
| Series | pinctrl: sirf: atlas7: use struct_size() in devm_kzalloc() | expand |
On Fri, Jan 4, 2019 at 10:35 PM Gustavo A. R. Silva <gustavo@embeddedor.com> wrote: > 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 code was detected with the help of Coccinelle. > > Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Patch applied. Yours, Linus Walleij
diff --git a/drivers/pinctrl/sirf/pinctrl-atlas7.c b/drivers/pinctrl/sirf/pinctrl-atlas7.c index 4ba171827428..8a0eee044264 100644 --- a/drivers/pinctrl/sirf/pinctrl-atlas7.c +++ b/drivers/pinctrl/sirf/pinctrl-atlas7.c @@ -6007,8 +6007,8 @@ static int atlas7_gpio_probe(struct platform_device *pdev) } /* retrieve gpio descriptor data */ - a7gc = devm_kzalloc(&pdev->dev, sizeof(*a7gc) + - sizeof(struct atlas7_gpio_bank) * nbank, GFP_KERNEL); + a7gc = devm_kzalloc(&pdev->dev, struct_size(a7gc, banks, nbank), + GFP_KERNEL); if (!a7gc) return -ENOMEM;
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 code was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> --- drivers/pinctrl/sirf/pinctrl-atlas7.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)