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* [PATCH] xen: use struct_size() helper in kzalloc()
@ 2019-04-03  5:26 Andrea Righi
  2019-04-03  6:00 ` Juergen Gross
                   ` (3 more replies)
  0 siblings, 4 replies; 7+ messages in thread
From: Andrea Righi @ 2019-04-03  5:26 UTC (permalink / raw)
  To: Boris Ostrovsky, Juergen Gross
  Cc: Stefano Stabellini, xen-devel, linux-kernel

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>
---
 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


^ permalink raw reply related	[flat|nested] 7+ messages in thread
* [PATCH] xen: use struct_size() helper in kzalloc()
@ 2019-04-03  5:26 Andrea Righi
  0 siblings, 0 replies; 7+ messages in thread
From: Andrea Righi @ 2019-04-03  5:26 UTC (permalink / raw)
  To: Boris Ostrovsky, Juergen Gross
  Cc: xen-devel, Stefano Stabellini, linux-kernel

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>
---
 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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^ permalink raw reply related	[flat|nested] 7+ messages in thread
end of thread, other threads:[~2019-04-05  6:48 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
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2019-04-03  5:26 [PATCH] xen: use struct_size() helper in kzalloc() Andrea Righi
2019-04-03  6:00 ` Juergen Gross
2019-04-03  6:00 ` Juergen Gross
2019-04-05  6:48 ` [Xen-devel] " Juergen Gross
2019-04-05  6:48   ` Juergen Gross
2019-04-05  6:48 ` Juergen Gross
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2019-04-03  5:26 Andrea Righi

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