* [PATCH] i2c: sun6i-pw2i: Prefer strscpy over strlcpy
@ 2021-08-17 16:58 Len Baker
2021-08-17 19:36 ` Wolfram Sang
0 siblings, 1 reply; 2+ messages in thread
From: Len Baker @ 2021-08-17 16:58 UTC (permalink / raw)
To: Maxime Ripard, Chen-Yu Tsai, Jernej Skrabec
Cc: Len Baker, linux-i2c, linux-arm-kernel, linux-sunxi, linux-kernel
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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] i2c: sun6i-pw2i: Prefer strscpy over strlcpy
2021-08-17 16:58 [PATCH] i2c: sun6i-pw2i: Prefer strscpy over strlcpy Len Baker
@ 2021-08-17 19:36 ` Wolfram Sang
0 siblings, 0 replies; 2+ messages in thread
From: Wolfram Sang @ 2021-08-17 19:36 UTC (permalink / raw)
To: Len Baker
Cc: Maxime Ripard, Chen-Yu Tsai, Jernej Skrabec, linux-i2c,
linux-arm-kernel, linux-sunxi, linux-kernel
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On Tue, Aug 17, 2021 at 06:58:59PM +0200, Len Baker wrote:
> 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>
Applied to for-next, thanks!
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