[PATCH] IB/usnic: Use struct_size() in kmalloc()

[PATCH] IB/usnic: Use struct_size() in kmalloc()

[Gustavo A. R. Silva]

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>
---
 drivers/infiniband/hw/usnic/usnic_uiom.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/hw/usnic/usnic_uiom.c b/drivers/infiniband/hw/usnic/usnic_uiom.c
index 49275a548751..ce01a59fccc4 100644
--- a/drivers/infiniband/hw/usnic/usnic_uiom.c
+++ b/drivers/infiniband/hw/usnic/usnic_uiom.c
@@ -157,9 +157,8 @@ static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable,
 		off = 0;
 
 		while (ret) {
-			chunk = kmalloc(sizeof(*chunk) +
-					sizeof(struct scatterlist) *
-					min_t(int, ret, USNIC_UIOM_PAGE_CHUNK),
+			chunk = kmalloc(struct_size(chunk, page_list,
+					min_t(int, ret, USNIC_UIOM_PAGE_CHUNK)),
 					GFP_KERNEL);
 			if (!chunk) {
 				ret = -ENOMEM;
-- 
2.20.1

Re: [PATCH] IB/usnic: Use struct_size() in kmalloc()

[Jason Gunthorpe]

On Mon, Jan 07, 2019 at 11:39:54AM -0600, Gustavo A. R. Silva wrote:
> 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>
> ---
>  drivers/infiniband/hw/usnic/usnic_uiom.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)

Applied to for-next, thanks

Jason