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Message-Id: <20250905015735.10347-1-chenyuan_fl@163.com>
Date: Fri, 5 Sep 2025 02:57:35 +0100
From: chenyuan_fl@....com
To: geert+renesas@...der.be,
mturquette@...libre.com,
sboyd@...nel.org,
kuninori.morimoto.gx@...esas.com
Cc: linux-renesas-soc@...r.kernel.org,
linux-clk@...r.kernel.org,
linux-kernel@...r.kernel.org,
Yuan CHen <chenyuan@...inos.cn>
Subject: [PATCH] clk: renesas: fix memory leak in cpg_mssr_reserved_init()
From: Yuan CHen <chenyuan@...inos.cn>
In the current implementation, when krealloc_array() fails, the original memory
pointer is incorrectly set to NULL after kfree(), resulting in a memory leak
during reallocation failure.
Fixes: 6aa17547649 ("clk: renesas: cpg-mssr: Ignore all clocks assigned to non-Linux system")
Signed-off-by: Yuan CHen <chenyuan@...inos.cn>
---
drivers/clk/renesas/renesas-cpg-mssr.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/renesas/renesas-cpg-mssr.c b/drivers/clk/renesas/renesas-cpg-mssr.c
index 5ff6ee1f7d4b..de1cf7ba45b7 100644
--- a/drivers/clk/renesas/renesas-cpg-mssr.c
+++ b/drivers/clk/renesas/renesas-cpg-mssr.c
@@ -1082,6 +1082,7 @@ static int __init cpg_mssr_reserved_init(struct cpg_mssr_priv *priv,
of_for_each_phandle(&it, rc, node, "clocks", "#clock-cells", -1) {
int idx;
+ unsigned int *new_ids;
if (it.node != priv->np)
continue;
@@ -1092,11 +1093,13 @@ static int __init cpg_mssr_reserved_init(struct cpg_mssr_priv *priv,
if (args[0] != CPG_MOD)
continue;
- ids = krealloc_array(ids, (num + 1), sizeof(*ids), GFP_KERNEL);
- if (!ids) {
+ new_ids = krealloc_array(ids, (num + 1), sizeof(*ids), GFP_KERNEL);
+ if (!new_ids) {
of_node_put(it.node);
+ kfree(ids);
return -ENOMEM;
}
+ ids = new_ids;
if (priv->reg_layout == CLK_REG_LAYOUT_RZ_A)
idx = MOD_CLK_PACK_10(args[1]); /* for DEF_MOD_STB() */
--
2.39.5
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