tree 9162ea83a01c9eb8883279cbfb10b44f12df69d6
parent b5179ec4187251a751832193693d6e474d3445ac
author Gustavo A. R. Silva <gustavo@embeddedor.com> 1548864467 +0100
committer Paolo Bonzini <pbonzini@redhat.com> 1550699300 +0100

kvm: Use struct_size() in kmalloc()

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 = kmalloc(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 = kmalloc(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: Paolo Bonzini <pbonzini@redhat.com>