linux-hardening - [PATCH 1/2] mfd: omap-usb-tll: annotate struct usbtll_omap with __counted

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Message-Id: <20240620-omap-usb-tll-counted_by-v1-1-77797834bb9a@gmail.com>
Date: Thu, 20 Jun 2024 23:22:33 +0200
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Tony Lindgren <tony@...mide.com>, Lee Jones <lee@...nel.org>, 
 Kees Cook <kees@...nel.org>, "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-hardening@...r.kernel.org, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: [PATCH 1/2] mfd: omap-usb-tll: annotate struct usbtll_omap with
 __counted_by

Use the __counted_by compiler attribute for the "struct clk *ch_clk[]"
flexible array member to improve the results of array bound sanitizers.

The comments for the variables are no longer needed as it is now clear
what is what.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 drivers/mfd/omap-usb-tll.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mfd/omap-usb-tll.c b/drivers/mfd/omap-usb-tll.c
index b6303ddb013b..a091e5b0f21d 100644
--- a/drivers/mfd/omap-usb-tll.c
+++ b/drivers/mfd/omap-usb-tll.c
@@ -98,8 +98,8 @@

 struct usbtll_omap {
 	void __iomem	*base;
-	int		nch;		/* num. of channels */
-	struct clk	*ch_clk[];	/* must be the last member */
+	int		nch;
+	struct clk	*ch_clk[] __counted_by(nch);
 };

 /*-------------------------------------------------------------------------*/

-- 
2.40.1