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xen: use struct_size() helper in kzalloc() 

struct privcmd_buf_vma_private has a zero-sized array at the end
(pages), use the new struct_size() helper to determine the proper
allocation size and avoid potential type mistakes.

Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Andrea Righi 2019-04-03 07:26:36 +02:00 committed by Juergen Gross
parent 0266def913
commit ad94dc3a7e
1 changed files with 1 additions and 2 deletions
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3
drivers/xen/privcmd-buf.c
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@ -140,8 +140,7 @@ static int privcmd_buf_mmap(struct file *file, struct vm_area_struct *vma)
if (!(vma->vm_flags & VM_SHARED))
return -EINVAL;
vma_priv = kzalloc(sizeof(*vma_priv) + count * sizeof(void *),
GFP_KERNEL);
vma_priv = kzalloc(struct_size(vma_priv, pages, count), GFP_KERNEL);
if (!vma_priv)
return -ENOMEM;