linux-kernel - [PATCH] powerpc: use strscpy to copy strings

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Date:   Mon, 20 Dec 2021 11:24:02 +0800
From:   Jason Wang <wangborong@...rlc.com>
To:     mpe@...erman.id.au
Cc:     benh@...nel.crashing.org, paulus@...ba.org, wangborong@...rlc.com,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH] powerpc: use strscpy to copy strings

The strlcpy should not be used because it doesn't limit the source
length. So that it will lead some potential bugs.

But the strscpy doesn't require reading memory from the src string
beyond the specified "count" bytes, and since the return value is
easier to error-check than strlcpy()'s. In addition, the implementation
is robust to the string changing out from underneath it, unlike the
current strlcpy() implementation.

Thus, replace strlcpy with strscpy.

Signed-off-by: Jason Wang <wangborong@...rlc.com>
---
 arch/powerpc/platforms/pasemi/misc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/pasemi/misc.c b/arch/powerpc/platforms/pasemi/misc.c
index 1bf65d02d3ba..06a1ffd43bfe 100644
--- a/arch/powerpc/platforms/pasemi/misc.c
+++ b/arch/powerpc/platforms/pasemi/misc.c
@@ -35,7 +35,7 @@ static int __init find_i2c_driver(struct device_node *node,
 	for (i = 0; i < ARRAY_SIZE(i2c_devices); i++) {
 		if (!of_device_is_compatible(node, i2c_devices[i].of_device))
 			continue;
-		if (strlcpy(info->type, i2c_devices[i].i2c_type,
+		if (strscpy(info->type, i2c_devices[i].i2c_type,
 			    I2C_NAME_SIZE) >= I2C_NAME_SIZE)
 			return -ENOMEM;
 		return 0;
-- 
2.34.1