linux-kernel - [PATCH] clocksource/drivers: Fix memory leaks in ttc_setup_clockevent and ttc_setup

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Message-Id: <20191220000923.9924-1-navid.emamdoost@gmail.com>
Date:   Thu, 19 Dec 2019 18:09:21 -0600
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     Michal Simek <michal.simek@...inx.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sören Brinkmann <soren.brinkmann@...inx.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     emamd001@....edu, Navid Emamdoost <navid.emamdoost@...il.com>
Subject: [PATCH] clocksource/drivers: Fix memory leaks in ttc_setup_clockevent and ttc_setup_clocksource

In the implementation of ttc_setup_clockevent() and
ttc_setup_clocksource(), the allocated memory for ttccs is leaked when
clk_notifier_register() fails. Use goto to direct the execution into error
handling path.

Fixes: 70504f311d4b ("clocksource/drivers/cadence_ttc: Convert init function to return error")
Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
 drivers/clocksource/timer-cadence-ttc.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/drivers/clocksource/timer-cadence-ttc.c b/drivers/clocksource/timer-cadence-ttc.c
index c6d11a1cb238..46d69982ad33 100644
--- a/drivers/clocksource/timer-cadence-ttc.c
+++ b/drivers/clocksource/timer-cadence-ttc.c
@@ -328,10 +328,8 @@ static int __init ttc_setup_clocksource(struct clk *clk, void __iomem *base,
 	ttccs->ttc.clk = clk;
 
 	err = clk_prepare_enable(ttccs->ttc.clk);
-	if (err) {
-		kfree(ttccs);
-		return err;
-	}
+	if (err)
+		goto release_ttcce;
 
 	ttccs->ttc.freq = clk_get_rate(ttccs->ttc.clk);
 
@@ -341,8 +339,10 @@ static int __init ttc_setup_clocksource(struct clk *clk, void __iomem *base,
 
 	err = clk_notifier_register(ttccs->ttc.clk,
 				    &ttccs->ttc.clk_rate_change_nb);
-	if (err)
+	if (err) {
 		pr_warn("Unable to register clock notifier.\n");
+		goto release_ttcce;
+	}
 
 	ttccs->ttc.base_addr = base;
 	ttccs->cs.name = "ttc_clocksource";
@@ -363,16 +363,20 @@ static int __init ttc_setup_clocksource(struct clk *clk, void __iomem *base,
 		     ttccs->ttc.base_addr + TTC_CNT_CNTRL_OFFSET);
 
 	err = clocksource_register_hz(&ttccs->cs, ttccs->ttc.freq / PRESCALE);
-	if (err) {
-		kfree(ttccs);
-		return err;
-	}
+	if (err)
+		goto release_ttcce;
 
 	ttc_sched_clock_val_reg = base + TTC_COUNT_VAL_OFFSET;
 	sched_clock_register(ttc_sched_clock_read, timer_width,
 			     ttccs->ttc.freq / PRESCALE);
 
 	return 0;
+
+release_ttcce:
+
+	kfree(ttcce);
+	return err;
+
 }
 
 static int ttc_rate_change_clockevent_cb(struct notifier_block *nb,
-- 
2.17.1