linux-kernel - [PATCH] clk: hisilicon: hi3559a: Fix an erroneous devm

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Date: Sun, 21 Jan 2024 16:16:24 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Dongjiu Geng <gengdongjiu@...wei.com>
Cc: linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	linux-clk@...r.kernel.org
Subject: [PATCH] clk: hisilicon: hi3559a: Fix an erroneous devm_kfree()

'p_clk' is an array allocated just before the for loop for all clk that
need to be registered.
It is incremented at each loop iteration.

If a clk_register() call fails, 'p_clk' may point to something different
from what should be freed.

The best we can do, is to avoid this wrong release of memory.

Fixes: 6c81966107dc ("clk: hisilicon: Add clock driver for hi3559A SoC")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
devm_kfree() is clearly wrong (IMHO :)), but just removing it is maybe not
the best solution.

Should hisi_clk_register_pll() return an error?
Should some data->clk_data.clks[clks[i].id] be set to NULL?
(hisi_clk_alloc() doesn't zero the allocated memory)
Should hisi_clk_alloc() use kzalloc() when allocating clk_table?
---
 drivers/clk/hisilicon/clk-hi3559a.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/clk/hisilicon/clk-hi3559a.c b/drivers/clk/hisilicon/clk-hi3559a.c
index ff4ca0edce06..4623befafaec 100644
--- a/drivers/clk/hisilicon/clk-hi3559a.c
+++ b/drivers/clk/hisilicon/clk-hi3559a.c
@@ -491,7 +491,6 @@ static void hisi_clk_register_pll(struct hi3559av100_pll_clock *clks,
 
 		clk = clk_register(NULL, &p_clk->hw);
 		if (IS_ERR(clk)) {
-			devm_kfree(dev, p_clk);
 			dev_err(dev, "%s: failed to register clock %s\n",
 			       __func__, clks[i].name);
 			continue;
-- 
2.43.0