linux-hardening - [PATCH] pinctrl: pinctrl-zynqmp: Use devm_kcalloc() instead of devm

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Message-Id: <20240119181909.7079-1-erick.archer@gmx.com>
Date: Fri, 19 Jan 2024 19:19:09 +0100
From: Erick Archer <erick.archer@....com>
To: Linus Walleij <linus.walleij@...aro.org>,
	Michal Simek <michal.simek@....com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Erick Archer <erick.archer@....com>,
	linux-gpio@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] pinctrl: pinctrl-zynqmp: Use devm_kcalloc() instead of devm_kzalloc()

As noted in the "Deprecated Interfaces, Language Features, Attributes,
and Conventions" documentation [1], size calculations (especially
multiplication) should not be performed in memory allocator (or similar)
function arguments due to the risk of them overflowing. This could lead
to values wrapping around and a smaller allocation being made than the
caller was expecting. Using those allocations could lead to linear
overflows of heap memory and other misbehaviors.

So, use the purpose specific devm_kcalloc() function instead of the
argument size * count in the devm_kzalloc() function.

Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1]
Link: https://github.com/KSPP/linux/issues/162
Signed-off-by: Erick Archer <erick.archer@....com>
---
 drivers/pinctrl/pinctrl-zynqmp.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-zynqmp.c b/drivers/pinctrl/pinctrl-zynqmp.c
index f2be341f73e1..5c46b7d7ebcb 100644
--- a/drivers/pinctrl/pinctrl-zynqmp.c
+++ b/drivers/pinctrl/pinctrl-zynqmp.c
@@ -562,7 +562,7 @@ static int zynqmp_pinctrl_prepare_func_groups(struct device *dev, u32 fid,
 	const char **fgroups;
 	int ret, index, i;

-	fgroups = devm_kzalloc(dev, sizeof(*fgroups) * func->ngroups, GFP_KERNEL);
+	fgroups = devm_kcalloc(dev, func->ngroups, sizeof(*fgroups), GFP_KERNEL);
 	if (!fgroups)
 		return -ENOMEM;

@@ -754,7 +754,7 @@ static int zynqmp_pinctrl_prepare_function_info(struct device *dev,
 	if (ret)
 		return ret;

-	funcs = devm_kzalloc(dev, sizeof(*funcs) * pctrl->nfuncs, GFP_KERNEL);
+	funcs = devm_kcalloc(dev, pctrl->nfuncs, sizeof(*funcs), GFP_KERNEL);
 	if (!funcs)
 		return -ENOMEM;

@@ -768,7 +768,7 @@ static int zynqmp_pinctrl_prepare_function_info(struct device *dev,
 		pctrl->ngroups += funcs[i].ngroups;
 	}

-	groups = devm_kzalloc(dev, sizeof(*groups) * pctrl->ngroups, GFP_KERNEL);
+	groups = devm_kcalloc(dev, pctrl->ngroups, sizeof(*groups), GFP_KERNEL);
 	if (!groups)
 		return -ENOMEM;

@@ -830,7 +830,7 @@ static int zynqmp_pinctrl_prepare_pin_desc(struct device *dev,
 	if (ret)
 		return ret;

-	pins = devm_kzalloc(dev, sizeof(*pins) * *npins, GFP_KERNEL);
+	pins = devm_kcalloc(dev, *npins, sizeof(*pins), GFP_KERNEL);
 	if (!pins)
 		return -ENOMEM;

--
2.25.1