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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
{
struct uwb_ie_drp *drp_ie;
- drp_ie = kzalloc(sizeof(struct uwb_ie_drp) +
- UWB_NUM_ZONES * sizeof(struct uwb_drp_alloc),
- GFP_KERNEL);
+ drp_ie = kzalloc(struct_size(drp_ie, allocs, UWB_NUM_ZONES),
+ GFP_KERNEL);
if (drp_ie)
drp_ie->hdr.element_id = UWB_IE_DRP;
return drp_ie;