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[next] brcmfmac: Replace zero-length arrays with flexible-array members

Message ID 20220216194935.GA904103@embeddedor (mailing list archive)
State Mainlined
Commit d8b1f4193e09acf99dfe423dfe2e654a189f5de8
Headers show
Series [next] brcmfmac: Replace zero-length arrays with flexible-array members | expand

Commit Message

Gustavo A. R. Silva Feb. 16, 2022, 7:49 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/broadcom/brcm80211/brcmfmac/fwil_types.h | 2 +-
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/xtlv.h       | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

Comments

Kees Cook Feb. 16, 2022, 8:34 p.m. UTC | #1
On Wed, Feb 16, 2022 at 01:49:35PM -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 Feb. 21, 2022, 8:59 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>

Patch applied to wireless-next.git, thanks.

d8b1f4193e09 brcmfmac: Replace zero-length arrays with flexible-array members
diff mbox series

Patch

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h
index e69d1e56996f..c87b829adb0d 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h
@@ -1068,7 +1068,7 @@  struct brcmf_mkeep_alive_pkt_le {
 	__le32  period_msec;
 	__le16  len_bytes;
 	u8   keep_alive_id;
-	u8   data[0];
+	u8   data[];
 } __packed;
 
 #endif /* FWIL_TYPES_H_ */
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/xtlv.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/xtlv.h
index e1930ce1b642..b2c7ae8966a1 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/xtlv.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/xtlv.h
@@ -15,7 +15,7 @@ 
 struct brcmf_xtlv {
 	u16 id;
 	u16 len;
-	u8 data[0];
+	u8 data[];
 };
 
 enum brcmf_xtlv_option {