linux-kernel - [PATCH] ARM: OMAP2+: Fix possible memory leak in omap_hwmod_allocate

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Date:   Fri, 19 Jun 2020 18:42:40 +0800
From:   Chen Tao <chentao107@...wei.com>
To:     <paul@...an.com>, <tony@...mide.com>
CC:     <linux@...linux.org.uk>, <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <chentao107@...wei.com>
Subject: [PATCH] ARM: OMAP2+: Fix possible memory leak in omap_hwmod_allocate_module

Fix memory leak in omap_hwmod_allocate_module not freeing in
handling error path.

Fixes: 8c87970543b17("ARM: OMAP2+: Add functions to allocate module data from device tree")
Signed-off-by: Chen Tao <chentao107@...wei.com>
---
 arch/arm/mach-omap2/omap_hwmod.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index 82706af307de..d2667f28e68e 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -3435,7 +3435,7 @@ static int omap_hwmod_allocate_module(struct device *dev, struct omap_hwmod *oh,
 		regs = ioremap(data->module_pa,
 			       data->module_size);
 		if (!regs)
-			return -ENOMEM;
+			goto out_free_sysc;
 	}
 
 	/*
@@ -3445,13 +3445,13 @@ static int omap_hwmod_allocate_module(struct device *dev, struct omap_hwmod *oh,
 	if (oh->class->name && strcmp(oh->class->name, data->name)) {
 		class = kmemdup(oh->class, sizeof(*oh->class), GFP_KERNEL);
 		if (!class)
-			return -ENOMEM;
+			goto out_unmap;
 	}
 
 	if (list_empty(&oh->slave_ports)) {
 		oi = kcalloc(1, sizeof(*oi), GFP_KERNEL);
 		if (!oi)
-			return -ENOMEM;
+			goto out_free_class;
 
 		/*
 		 * Note that we assume interconnect interface clocks will be
@@ -3478,6 +3478,14 @@ static int omap_hwmod_allocate_module(struct device *dev, struct omap_hwmod *oh,
 	spin_unlock_irqrestore(&oh->_lock, flags);
 
 	return 0;
+
+out_free_class:
+	kfree(class);
+out_unmap:
+	iounmap();
+out_free_sysc:
+	kfree(sysc);
+	return -ENOMEM;
 }
 
 static const struct omap_hwmod_reset omap24xx_reset_quirks[] = {
-- 
2.22.0