linux-hardening - [PATCH v2 4/4] clk: ti: Replace kstrdup() + strreplace() with kstrdup_and

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Date:   Fri,  4 Aug 2023 17:39:10 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Saravana Kannan <saravanak@...gle.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Dario Binacchi <dario.binacchi@...rulasolutions.com>,
        Tony Lindgren <tony@...mide.com>, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-hardening@...r.kernel.org
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Michael Turquette <mturquette@...libre.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Tero Kristo <kristo@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Andy Shevchenko <andy@...nel.org>
Subject: [PATCH v2 4/4] clk: ti: Replace kstrdup() + strreplace() with kstrdup_and_replace()

Replace open coded functionality of kstrdup_and_replace() with a call.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/clk/ti/clk.c     | 4 ++--
 drivers/clk/ti/clkctrl.c | 9 +++++----
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/clk/ti/clk.c b/drivers/clk/ti/clk.c
index 3d636938a739..1862958ab412 100644
--- a/drivers/clk/ti/clk.c
+++ b/drivers/clk/ti/clk.c
@@ -16,6 +16,7 @@
 #include <linux/of_address.h>
 #include <linux/list.h>
 #include <linux/regmap.h>
+#include <linux/string_helpers.h>
 #include <linux/memblock.h>
 #include <linux/device.h>
 
@@ -123,10 +124,9 @@ static struct device_node *ti_find_clock_provider(struct device_node *from,
 	const char *n;
 	char *tmp;
 
-	tmp = kstrdup(name, GFP_KERNEL);
+	tmp = kstrdup_and_replace(name, '-', '_', GFP_KERNEL);
 	if (!tmp)
 		return NULL;
-	strreplace(tmp, '-', '_');
 
 	/* Node named "clock" with "clock-output-names" */
 	for_each_of_allnodes_from(from, np) {
diff --git a/drivers/clk/ti/clkctrl.c b/drivers/clk/ti/clkctrl.c
index 8c40f10280b7..607e34d8e289 100644
--- a/drivers/clk/ti/clkctrl.c
+++ b/drivers/clk/ti/clkctrl.c
@@ -13,6 +13,7 @@
 #include <linux/of_address.h>
 #include <linux/clk/ti.h>
 #include <linux/delay.h>
+#include <linux/string_helpers.h>
 #include <linux/timekeeping.h>
 #include "clock.h"
 
@@ -473,11 +474,11 @@ static const char * __init clkctrl_get_name(struct device_node *np)
 	const int prefix_len = 11;
 	const char *compat;
 	const char *output;
+	const char *end;
 	char *name;
 
 	if (!of_property_read_string_index(np, "clock-output-names", 0,
 					   &output)) {
-		const char *end;
 		int len;
 
 		len = strlen(output);
@@ -491,13 +492,13 @@ static const char * __init clkctrl_get_name(struct device_node *np)
 
 	of_property_for_each_string(np, "compatible", prop, compat) {
 		if (!strncmp("ti,clkctrl-", compat, prefix_len)) {
+			end = compat + prefix_len;
 			/* Two letter minimum name length for l3, l4 etc */
-			if (strnlen(compat + prefix_len, 16) < 2)
+			if (strnlen(end, 16) < 2)
 				continue;
-			name = kasprintf(GFP_KERNEL, "%s", compat + prefix_len);
+			name = kstrdup_and_replace(end, '-', '_', GFP_KERNEL);
 			if (!name)
 				continue;
-			strreplace(name, '-', '_');
 
 			return name;
 		}
-- 
2.40.0.1.gaa8946217a0b