linux-kernel - [RFC PATCH 3/4] clk: use kstrdup_const for clock name allocations

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 29 Dec 2014 15:48:29 +0100
From:	Andrzej Hajda <a.hajda@...sung.com>
To:	linux-mm@...ck.org
Cc:	Andrzej Hajda <a.hajda@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 3/4] clk: use kstrdup_const for clock name allocations

Clock subsystem frequently performs duplication of strings located
in read-only memory section. Replacing kstrdup by kstrdup_const
allows to avoid such operations.

Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
---
 drivers/clk/clk.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index f4963b7..27e644a 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2048,7 +2048,7 @@ struct clk *clk_register(struct device *dev, struct clk_hw *hw)
 		goto fail_out;
 	}
 
-	clk->name = kstrdup(hw->init->name, GFP_KERNEL);
+	clk->name = kstrdup_const(hw->init->name, GFP_KERNEL);
 	if (!clk->name) {
 		pr_err("%s: could not allocate clk->name\n", __func__);
 		ret = -ENOMEM;
@@ -2075,7 +2075,7 @@ struct clk *clk_register(struct device *dev, struct clk_hw *hw)
 
 	/* copy each string name in case parent_names is __initdata */
 	for (i = 0; i < clk->num_parents; i++) {
-		clk->parent_names[i] = kstrdup(hw->init->parent_names[i],
+		clk->parent_names[i] = kstrdup_const(hw->init->parent_names[i],
 						GFP_KERNEL);
 		if (!clk->parent_names[i]) {
 			pr_err("%s: could not copy parent_names\n", __func__);
@@ -2090,10 +2090,10 @@ struct clk *clk_register(struct device *dev, struct clk_hw *hw)
 
 fail_parent_names_copy:
 	while (--i >= 0)
-		kfree(clk->parent_names[i]);
+		kfree_const(clk->parent_names[i]);
 	kfree(clk->parent_names);
 fail_parent_names:
-	kfree(clk->name);
+	kfree_const(clk->name);
 fail_name:
 	kfree(clk);
 fail_out:
@@ -2112,10 +2112,10 @@ static void __clk_release(struct kref *ref)
 
 	kfree(clk->parents);
 	while (--i >= 0)
-		kfree(clk->parent_names[i]);
+		kfree_const(clk->parent_names[i]);
 
 	kfree(clk->parent_names);
-	kfree(clk->name);
+	kfree_const(clk->name);
 	kfree(clk);
 }
 
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/