linux-kernel - [PATCH v2] edac: fix the leak of mci->bus->name when bus

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Date:	Thu, 29 Jan 2015 09:13:55 +0800
From:	Junjie Mao <junjie.mao@...mail.com>
To:	Doug Thompson <dougthompson@...ssion.com>
CC:	Borislav Petkov <bp@...en8.de>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
	Junjie Mao <junjie.mao@...mail.com>
Subject: [PATCH v2] edac: fix the leak of mci->bus->name when bus_register fails

Also use goto labels for all failure paths in edac_create_sysfs_mci_device and
update meaningless labels.

Signed-off-by: Junjie Mao <junjie.mao@...mail.com>
---
 drivers/edac/edac_mc_sysfs.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 670d2829c547..8e48d32efe37 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -989,7 +989,7 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)

 	err = bus_register(mci->bus);
 	if (err < 0)
-		return err;
+		goto fail_free_name;

 	/* get the /sys/devices/system/edac subsys reference */
 	mci->dev.type = &mci_attr_type;
@@ -1005,9 +1005,7 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 	err = device_add(&mci->dev);
 	if (err < 0) {
 		edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev));
-		bus_unregister(mci->bus);
-		kfree(mci->bus->name);
-		return err;
+		goto fail_unregister_bus;
 	}

 	if (mci->set_sdram_scrub_rate || mci->get_sdram_scrub_rate) {
@@ -1023,7 +1021,7 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 					 &dev_attr_sdram_scrub_rate);
 		if (err) {
 			edac_dbg(1, "failure: create sdram_scrub_rate\n");
-			goto fail2;
+			goto fail_unregister_dev;
 		}
 	}
 	/*
@@ -1048,14 +1046,14 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 		err = edac_create_dimm_object(mci, dimm, i);
 		if (err) {
 			edac_dbg(1, "failure: create dimm %d obj\n", i);
-			goto fail;
+			goto fail_unregister_dimm;
 		}
 	}

 #ifdef CONFIG_EDAC_LEGACY_SYSFS
 	err = edac_create_csrow_objects(mci);
 	if (err < 0)
-		goto fail;
+		goto fail_unregister_dimm;
 #endif

 #ifdef CONFIG_EDAC_DEBUG
@@ -1063,16 +1061,18 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 #endif
 	return 0;

-fail:
+fail_unregister_dimm:
 	for (i--; i >= 0; i--) {
 		struct dimm_info *dimm = mci->dimms[i];
 		if (dimm->nr_pages == 0)
 			continue;
 		device_unregister(&dimm->dev);
 	}
-fail2:
+fail_unregister_dev:
 	device_unregister(&mci->dev);
+fail_unregister_bus:
 	bus_unregister(mci->bus);
+fail_free_name:
 	kfree(mci->bus->name);
 	return err;
 }
--
1.9.3
--
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