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[next] iwlwifi: mei: Replace zero-length array with flexible-array member

Message ID 20220216195030.GA904170@embeddedor
State New
Headers show
Series [next] iwlwifi: mei: Replace zero-length array with flexible-array member | expand

Commit Message

Gustavo A. R. Silva Feb. 16, 2022, 7:50 p.m. UTC
There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use “flexible array members”[1] for these
cases. The older style of one-element or zero-length arrays should
no longer be used[2].

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays

Link: https://github.com/KSPP/linux/issues/78
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/net/wireless/intel/iwlwifi/mei/sap.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Kees Cook Feb. 16, 2022, 8:35 p.m. UTC | #1
On Wed, Feb 16, 2022 at 01:50:30PM -0600, Gustavo A. R. Silva wrote:
> There is a regular need in the kernel to provide a way to declare
> having a dynamically sized set of trailing elements in a structure.
> Kernel code should always use “flexible array members”[1] for these
> cases. The older style of one-element or zero-length arrays should
> no longer be used[2].
> 
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
> 
> Link: https://github.com/KSPP/linux/issues/78
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Reviewed-by: Kees Cook <keescook@chromium.org>
Kalle Valo April 6, 2022, 7:19 a.m. UTC | #2
"Gustavo A. R. Silva" <gustavoars@kernel.org> wrote:

> There is a regular need in the kernel to provide a way to declare
> having a dynamically sized set of trailing elements in a structure.
> Kernel code should always use “flexible array members”[1] for these
> cases. The older style of one-element or zero-length arrays should
> no longer be used[2].
> 
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
> 
> Link: https://github.com/KSPP/linux/issues/78
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> Reviewed-by: Kees Cook <keescook@chromium.org>
> Acked-by: Luca Coelho <luciano.coelho@intel.com>

Patch applied to wireless-next.git, thanks.

c5f675748cf0 iwlwifi: mei: Replace zero-length array with flexible-array member
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Patch

diff --git a/drivers/net/wireless/intel/iwlwifi/mei/sap.h b/drivers/net/wireless/intel/iwlwifi/mei/sap.h
index 11e3009121cc..be1456dea484 100644
--- a/drivers/net/wireless/intel/iwlwifi/mei/sap.h
+++ b/drivers/net/wireless/intel/iwlwifi/mei/sap.h
@@ -298,7 +298,7 @@  struct iwl_sap_hdr {
 	__le16 type;
 	__le16 len;
 	__le32 seq_num;
-	u8 payload[0];
+	u8 payload[];
 };
 
 /**