linux-hardening - [PATCH] i2c: Replace all non-returning strlcpy with strscpy

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Date:   Tue, 23 May 2023 02:11:50 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Sakari Ailus <sakari.ailus@....fi>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>
Subject: [PATCH] i2c: Replace all non-returning strlcpy with strscpy

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 [1].
In an effort to remove strlcpy() completely [2], replace
strlcpy() here with strscpy().
No return values were used, so direct replacement is safe.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Signed-off-by: Azeem Shaikh <azeemshaikh38@...il.com>
---
 drivers/leds/flash/leds-as3645a.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/leds/flash/leds-as3645a.c b/drivers/leds/flash/leds-as3645a.c
index bb2249771acb..7dc574b18f5f 100644
--- a/drivers/leds/flash/leds-as3645a.c
+++ b/drivers/leds/flash/leds-as3645a.c
@@ -651,8 +651,8 @@ static int as3645a_v4l2_setup(struct as3645a *flash)
 		},
 	};
 
-	strlcpy(cfg.dev_name, led->dev->kobj.name, sizeof(cfg.dev_name));
-	strlcpy(cfgind.dev_name, flash->iled_cdev.dev->kobj.name,
+	strscpy(cfg.dev_name, led->dev->kobj.name, sizeof(cfg.dev_name));
+	strscpy(cfgind.dev_name, flash->iled_cdev.dev->kobj.name,
 		sizeof(cfgind.dev_name));
 
 	flash->vf = v4l2_flash_init(