* [PATCH][next] zd1211rw: use struct_size() helper
@ 2019-04-03 18:59 Gustavo A. R. Silva
2019-04-25 16:50 ` Kalle Valo
0 siblings, 1 reply; 2+ messages in thread
From: Gustavo A. R. Silva @ 2019-04-03 18:59 UTC (permalink / raw)
To: Daniel Drake, Ulrich Kunitz, Kalle Valo, David S. Miller
Cc: linux-wireless, netdev, linux-kernel, Gustavo A. R. Silva
Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes, in particular in the
context in which this code is being used.
So, replace code of the following form:
sizeof(struct usb_req_write_regs) + count * sizeof(struct reg_data)
with:
struct_size(req, reg_writes, count)
This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
drivers/net/wireless/zydas/zd1211rw/zd_usb.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/net/wireless/zydas/zd1211rw/zd_usb.c b/drivers/net/wireless/zydas/zd1211rw/zd_usb.c
index c2cda3acd4af..a094d5b3383c 100644
--- a/drivers/net/wireless/zydas/zd1211rw/zd_usb.c
+++ b/drivers/net/wireless/zydas/zd1211rw/zd_usb.c
@@ -1917,8 +1917,7 @@ int zd_usb_iowrite16v_async(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
if (!urb)
return -ENOMEM;
- req_len = sizeof(struct usb_req_write_regs) +
- count * sizeof(struct reg_data);
+ req_len = struct_size(req, reg_writes, count);
req = kmalloc(req_len, GFP_KERNEL);
if (!req) {
r = -ENOMEM;
--
2.21.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH][next] zd1211rw: use struct_size() helper
2019-04-03 18:59 [PATCH][next] zd1211rw: use struct_size() helper Gustavo A. R. Silva
@ 2019-04-25 16:50 ` Kalle Valo
0 siblings, 0 replies; 2+ messages in thread
From: Kalle Valo @ 2019-04-25 16:50 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Daniel Drake, Ulrich Kunitz, David S. Miller, linux-wireless,
netdev, linux-kernel, Gustavo A. R. Silva
"Gustavo A. R. Silva" <gustavo@embeddedor.com> wrote:
> Make use of the struct_size() helper instead of an open-coded version
> in order to avoid any potential type mistakes, in particular in the
> context in which this code is being used.
>
> So, replace code of the following form:
>
> sizeof(struct usb_req_write_regs) + count * sizeof(struct reg_data)
>
> with:
>
> struct_size(req, reg_writes, count)
>
> This code was detected with the help of Coccinelle.
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Patch applied to wireless-drivers-next.git, thanks.
0c7beb2db9a5 zd1211rw: use struct_size() helper
--
https://patchwork.kernel.org/patch/10884349/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
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