netdev - [PATCH] brcmfmac: Replace zero-length array with flexible array member

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Message-Id: <20210904092217.2848-1-len.baker@gmx.com>
Date:   Sat,  4 Sep 2021 11:22:17 +0200
From:   Len Baker <len.baker@....com>
To:     Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-hsien Lin <chi-hsien.lin@...ineon.com>,
        Wright Feng <wright.feng@...ineon.com>,
        Chung-hsien Hsu <chung-hsien.hsu@...ineon.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Len Baker <len.baker@....com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Kees Cook <keescook@...omium.org>,
        Shawn Guo <shawn.guo@...aro.org>,
        linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com, netdev@...r.kernel.org,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] brcmfmac: Replace zero-length array with flexible array member

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].

Also, make use of the struct_size() helper in devm_kzalloc().

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.14/process/deprecated.html#zero-length-and-one-element-arrays

Signed-off-by: Len Baker <len.baker@....com>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c | 2 +-
 include/linux/platform_data/brcmfmac.h                | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
index 2f7bc3a70c65..513c7e6421b2 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
@@ -29,7 +29,7 @@ static int brcmf_of_get_country_codes(struct device *dev,
 		return (count == -EINVAL) ? 0 : count;
 	}

-	cc = devm_kzalloc(dev, sizeof(*cc) + count * sizeof(*cce), GFP_KERNEL);
+	cc = devm_kzalloc(dev, struct_size(cc, table, count), GFP_KERNEL);
 	if (!cc)
 		return -ENOMEM;

diff --git a/include/linux/platform_data/brcmfmac.h b/include/linux/platform_data/brcmfmac.h
index 1d30bf278231..2b5676ff35be 100644
--- a/include/linux/platform_data/brcmfmac.h
+++ b/include/linux/platform_data/brcmfmac.h
@@ -125,7 +125,7 @@ struct brcmfmac_pd_cc_entry {
  */
 struct brcmfmac_pd_cc {
 	int				table_size;
-	struct brcmfmac_pd_cc_entry	table[0];
+	struct brcmfmac_pd_cc_entry	table[];
 };

 /**
--
2.25.1