linux-hardening - [PATCH v4 8/8] dmaengine: ste_dma40: Use new helpers from overflow.h

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Message-ID: <20240228204919.3680786-9-andriy.shevchenko@linux.intel.com>
Date: Wed, 28 Feb 2024 22:41:38 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Vinod Koul <vkoul@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Mark Brown <broonie@...nel.org>,
	Kees Cook <keescook@...omium.org>,
	linux-arm-kernel@...ts.infradead.org,
	dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-iio@...r.kernel.org,
	linux-spi@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-hardening@...r.kernel.org
Cc: Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Subject: [PATCH v4 8/8] dmaengine: ste_dma40: Use new helpers from overflow.h

We have two new helpers struct_size_with_data() and struct_data_pointer()
that we can utilize in d40_hw_detect_init(). Do it so.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/dma/ste_dma40.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 2c489299148e..bead3b8836c7 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -15,6 +15,7 @@
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/log2.h>
+#include <linux/overflow.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
 #include <linux/err.h>
@@ -3141,6 +3142,7 @@ static int __init d40_hw_detect_init(struct platform_device *pdev,
 	int num_log_chans;
 	int num_phy_chans;
 	int num_memcpy_chans;
+	size_t sz;
 	int i;
 	u32 pid;
 	u32 cid;
@@ -3207,11 +3209,9 @@ static int __init d40_hw_detect_init(struct platform_device *pdev,
 		 "hardware rev: %d with %d physical and %d logical channels\n",
 		 rev, num_phy_chans, num_log_chans);
 
-	base = devm_kzalloc(dev,
-		ALIGN(sizeof(struct d40_base), 4) +
-		(num_phy_chans + num_log_chans + num_memcpy_chans) *
-		sizeof(struct d40_chan), GFP_KERNEL);
-
+	sz = array_size(num_phy_chans + num_log_chans + num_memcpy_chans,
+			sizeof(struct d40_chan));
+	base = devm_kzalloc(dev, struct_size_with_data(base, 4, sz), GFP_KERNEL);
 	if (!base)
 		return -ENOMEM;
 
@@ -3223,7 +3223,7 @@ static int __init d40_hw_detect_init(struct platform_device *pdev,
 	base->virtbase = virtbase;
 	base->plat_data = plat_data;
 	base->dev = dev;
-	base->phy_chans = ((void *)base) + ALIGN(sizeof(struct d40_base), 4);
+	base->phy_chans = struct_data_pointer(base, 4);
 	base->log_chans = &base->phy_chans[num_phy_chans];
 
 	if (base->plat_data->num_of_phy_chans == 14) {
-- 
2.43.0.rc1.1.gbec44491f096