linux-kernel - [PATCH] clk: fix a missing-free bug in clk_cpy

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Message-ID: <20190531011424.GA4374@zhanggen-UX430UQ>
Date:   Fri, 31 May 2019 09:14:24 +0800
From:   Gen Zhang <blackgod016574@...il.com>
To:     mturquette@...libre.com, sboyd@...nel.org
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] clk: fix a missing-free bug in clk_cpy_name()

In clk_cpy_name(), '*dst_p'('parent->name'and 'parent->fw_name') and 
'dst' are allcoted by kstrdup_const(). According to doc: "Strings 
allocated by kstrdup_const should be freed by kfree_const". So 
'parent->name', 'parent->fw_name' and 'dst' should be freed.

Signed-off-by: Gen Zhang <blackgod016574@...il.com>
---
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index aa51756..85c4d3f 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3435,6 +3435,7 @@ static int clk_cpy_name(const char **dst_p, const char *src, bool must_exist)
 	if (!dst)
 		return -ENOMEM;
 
+	kfree_const(dst);
 	return 0;
 }
 
@@ -3491,6 +3492,8 @@ static int clk_core_populate_parent_map(struct clk_core *core)
 				kfree_const(parents[i].name);
 				kfree_const(parents[i].fw_name);
 			} while (--i >= 0);
+			kfree_const(parent->name);
+			kfree_const(parent->fw_name);
 			kfree(parents);
 
 			return ret;
---