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From: Len Baker <len.baker@gmx.com>
To: Maxime Ripard <mripard@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
	Jernej Skrabec <jernej.skrabec@gmail.com>
Cc: Len Baker <len.baker@gmx.com>,
	linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: [PATCH] i2c: sun6i-pw2i: Prefer strscpy over strlcpy
Date: Tue, 17 Aug 2021 18:58:59 +0200	[thread overview]
Message-ID: <20210817165859.5429-1-len.baker@gmx.com> (raw)

strlcpy() reads the entire source buffer first. This read may exceed the
destination size limit. This is both inefficient and can lead to linear
read overflows if a source string is not NUL-terminated. The safe
replacement is strscpy().

This is a previous step in the path to remove the strlcpy() function
entirely from the kernel [1].

[1] https://github.com/KSPP/linux/issues/89

Signed-off-by: Len Baker <len.baker@gmx.com>
---
 drivers/i2c/busses/i2c-sun6i-p2wi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-sun6i-p2wi.c b/drivers/i2c/busses/i2c-sun6i-p2wi.c
index 2f6f6468214d..9e3483f507ff 100644
--- a/drivers/i2c/busses/i2c-sun6i-p2wi.c
+++ b/drivers/i2c/busses/i2c-sun6i-p2wi.c
@@ -234,7 +234,7 @@ static int p2wi_probe(struct platform_device *pdev)
 	if (IS_ERR(p2wi->regs))
 		return PTR_ERR(p2wi->regs);

-	strlcpy(p2wi->adapter.name, pdev->name, sizeof(p2wi->adapter.name));
+	strscpy(p2wi->adapter.name, pdev->name, sizeof(p2wi->adapter.name));
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;
--
2.25.1


             reply	other threads:[~2021-08-17 16:59 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-17 16:58 Len Baker [this message]
2021-08-17 19:36 ` Wolfram Sang

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