[01/10] clk: ti: Less function calls in of_omap2_apll_setup() after error detection

Commit Message

Markus Elfring Dec. 24, 2023, 4:36 p.m. UTC

From: Markus Elfring <[e-mail]>
Date: Sun, 24 Dec 2023 11:15:27 +0100

The kfree() function was called in up to three cases by
the of_omap2_apll_setup() function during error handling
even if the passed variable contained a null pointer.
This issue was detected by using the Coccinelle software.

* Split a condition check.

* Adjust jump targets.

* Delete three initialisations which became unnecessary
  with this refactoring.

Signed-off-by: Markus Elfring <[e-mail]>
---
 drivers/clk/ti/apll.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

--
2.43.0

Comments

Andy Shevchenko Dec. 27, 2023, 4:38 p.m. UTC | #1

On Sun, Dec 24, 2023 at 05:36:57PM +0100, Markus Elfring wrote:
> From: Markus Elfring <[e-mail]>
> Date: Sun, 24 Dec 2023 11:15:27 +0100
> 
> The kfree() function was called in up to three cases by
> the of_omap2_apll_setup() function during error handling
> even if the passed variable contained a null pointer.
> This issue was detected by using the Coccinelle software.

> * Split a condition check.
> 
> * Adjust jump targets.
> 
> * Delete three initialisations which became unnecessary
>   with this refactoring.

Instead, make use of cleanup.h.

Patch

diff --git a/drivers/clk/ti/apll.c b/drivers/clk/ti/apll.c
index 93183287c58d..929c021f0cdb 100644
--- a/drivers/clk/ti/apll.c
+++ b/drivers/clk/ti/apll.c
@@ -338,21 +338,25 @@  static const struct clk_hw_omap_ops omap2_apll_hwops = {

 static void __init of_omap2_apll_setup(struct device_node *node)
 {
-	struct dpll_data *ad = NULL;
-	struct clk_hw_omap *clk_hw = NULL;
-	struct clk_init_data *init = NULL;
+	struct dpll_data *ad;
+	struct clk_hw_omap *clk_hw;
+	struct clk_init_data *init = kzalloc(sizeof(*init), GFP_KERNEL);
 	const char *name;
 	struct clk *clk;
 	const char *parent_name;
 	u32 val;
 	int ret;

-	ad = kzalloc(sizeof(*ad), GFP_KERNEL);
+	if (!init)
+		return;
+
 	clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
-	init = kzalloc(sizeof(*init), GFP_KERNEL);
+	if (!clk_hw)
+		goto free_init;

-	if (!ad || !clk_hw || !init)
-		goto cleanup;
+	ad = kzalloc(sizeof(*ad), GFP_KERNEL);
+	if (!ad)
+		goto free_clk_hw;

 	clk_hw->dpll_data = ad;
 	clk_hw->hw.init = init;
@@ -403,12 +407,13 @@  static void __init of_omap2_apll_setup(struct device_node *node)
 	clk = of_ti_clk_register_omap_hw(node, &clk_hw->hw, name);
 	if (!IS_ERR(clk)) {
 		of_clk_add_provider(node, of_clk_src_simple_get, clk);
-		kfree(init);
-		return;
+		goto free_init;
 	}
 cleanup:
 	kfree(ad);
+free_clk_hw:
 	kfree(clk_hw);
+free_init:
 	kfree(init);
 }
 CLK_OF_DECLARE(omap2_apll_clock, "ti,omap2-apll-clock",