linux-kernel - [PATCH v2] edd: fix possible memory leak in edd

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Date:	Tue, 13 Jul 2010 09:30:57 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	David Teigland <teigland@...hat.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"Hans J. Koch" <hjk@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v2] edd: fix possible memory leak in edd_init() error path

The error may happen at any iteration of the for loop,
this patch properly unregisters already registed edd_devices in error path.

Signed-off-by: Axel Lin <axel.lin@...il.com>
---
 drivers/firmware/edd.c |   21 ++++++++++++++-------
 1 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/firmware/edd.c b/drivers/firmware/edd.c
index 110e24e..37a56be 100644
--- a/drivers/firmware/edd.c
+++ b/drivers/firmware/edd.c
@@ -744,7 +744,7 @@ static inline int edd_num_devices(void)
 static int __init
 edd_init(void)
 {
-	unsigned int i;
+	int i;
 	int rc=0;
 	struct edd_device *edev;
 
@@ -760,21 +760,28 @@ edd_init(void)
 	if (!edd_kset)
 		return -ENOMEM;
 
-	for (i = 0; i < edd_num_devices() && !rc; i++) {
+	for (i = 0; i < edd_num_devices(); i++) {
 		edev = kzalloc(sizeof (*edev), GFP_KERNEL);
-		if (!edev)
-			return -ENOMEM;
+		if (!edev) {
+			rc = -ENOMEM;
+			goto out;
+		}
 
 		rc = edd_device_register(edev, i);
 		if (rc) {
 			kfree(edev);
-			break;
+			goto out;
 		}
 		edd_devices[i] = edev;
 	}
 
-	if (rc)
-		kset_unregister(edd_kset);
+	return 0;
+
+out:
+	while (--i >= 0) {
+		edd_device_unregister(edd_devices[i]);
+	}
+	kset_unregister(edd_kset);
 	return rc;
 }
 
-- 
1.5.4.3



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