From: Erick Archer <erick.archer@gmx.com>
To: "Michael Turquette" <mturquette@baylibre.com>,
"Stephen Boyd" <sboyd@kernel.org>,
"Conor Dooley" <conor.dooley@microchip.com>,
"Heiko Stuebner" <heiko@sntech.de>,
"Dinh Nguyen" <dinguyen@kernel.org>,
"Rob Herring" <robh@kernel.org>,
"Nick Alcock" <nick.alcock@oracle.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: Erick Archer <erick.archer@gmx.com>,
linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-hardening@vger.kernel.org
Subject: [PATCH] clk: hisilicon: Use devm_kcalloc() instead of devm_kzalloc()
Date: Sun, 21 Jan 2024 15:29:46 +0100 [thread overview]
Message-ID: <20240121142946.2796-1-erick.archer@gmx.com> (raw)
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@gmx.com>
---
drivers/clk/hisilicon/clk-hi3559a.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/clk/hisilicon/clk-hi3559a.c b/drivers/clk/hisilicon/clk-hi3559a.c
index ff4ca0edce06..da476f940326 100644
--- a/drivers/clk/hisilicon/clk-hi3559a.c
+++ b/drivers/clk/hisilicon/clk-hi3559a.c
@@ -461,8 +461,7 @@ static void hisi_clk_register_pll(struct hi3559av100_pll_clock *clks,
struct clk_init_data init;
int i;
- p_clk = devm_kzalloc(dev, sizeof(*p_clk) * nums, GFP_KERNEL);
-
+ p_clk = devm_kcalloc(dev, nums, sizeof(*p_clk), GFP_KERNEL);
if (!p_clk)
return;
--
2.25.1
next reply other threads:[~2024-01-21 14:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-21 14:29 Erick Archer [this message]
2024-01-22 6:56 ` [PATCH] clk: hisilicon: Use devm_kcalloc() instead of devm_kzalloc() Uwe Kleine-König
2024-01-22 17:51 ` Gustavo A. R. Silva
2024-02-22 4:27 ` Stephen Boyd
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