[Xen-devel] [PATCH] xen: use struct_size() helper in kzalloc()

[Andrea Righi <andrea.righi@xxxxxxxxxxxxx>]

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@xxxxxxxxxxxxx>
---
 drivers/xen/privcmd-buf.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/xen/privcmd-buf.c b/drivers/xen/privcmd-buf.c
index de01a6d0059d..a1c61e351d3f 100644
--- a/drivers/xen/privcmd-buf.c
+++ b/drivers/xen/privcmd-buf.c
@@ -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;
 
-- 
2.19.1


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