linux-kernel - EDAC: Fix memory leak in creating CSROW object

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Date:   Thu, 18 Apr 2019 10:27:18 +0800
From:   Pan Bian <bianpan2016@....com>
To:     Borislav Petkov <bp@...en8.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        James Morse <james.morse@....com>
Cc:     linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pan Bian <bianpan2016@....com>
Subject: EDAC: Fix memory leak in creating CSROW object

In the function that creates a CSROW object, the object is not released
when failing to add the device to device hierarchy. This may result in a
memory leak bug.

Signed-off-by: Pan Bian <bianpan2016@....com>
---
 drivers/edac/edac_mc_sysfs.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 4641746..2dafb08 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -404,6 +404,7 @@ static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 				    struct csrow_info *csrow, int index)
 {
+	int err;
 	csrow->dev.type = &csrow_attr_type;
 	csrow->dev.groups = csrow_dev_groups;
 	device_initialize(&csrow->dev);
@@ -415,7 +416,10 @@ static int edac_create_csrow_object(struct mem_ctl_info *mci,
 	edac_dbg(0, "creating (virtual) csrow node %s\n",
 		 dev_name(&csrow->dev));
 
-	return device_add(&csrow->dev);
+	err = device_add(&csrow->dev);
+	if (err)
+		put_device(&csrow->dev);
+	return err;
 }
 
 /* Create a CSROW object under specifed edac_mc_device */
-- 
2.7.4