linux-kernel - [PATCH 4.2.y-ckt 032/211] mtd: mtdpart: fix add_mtd

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Message-Id: <1452023119-25647-33-git-send-email-kamal@canonical.com>
Date:	Tue,  5 Jan 2016 11:42:20 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Brian Norris <computersforpeace@...il.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 032/211] mtd: mtdpart: fix add_mtd_partitions error path

4.2.8-ckt1 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Boris BREZILLON <boris.brezillon@...e-electrons.com>

commit e5bae86797141e4a95e42d825f737cb36d7b8c37 upstream.

If we fail to allocate a partition structure in the middle of the partition
creation process, the already allocated partitions are never removed, which
means they are still present in the partition list and their resources are
never freed.

Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@...il.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/mtd/mtdpart.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index cafdb88..919a936 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -664,8 +664,10 @@ int add_mtd_partitions(struct mtd_info *master,
 
 	for (i = 0; i < nbparts; i++) {
 		slave = allocate_partition(master, parts + i, i, cur_offset);
-		if (IS_ERR(slave))
+		if (IS_ERR(slave)) {
+			del_mtd_partitions(master);
 			return PTR_ERR(slave);
+		}
 
 		mutex_lock(&mtd_partitions_mutex);
 		list_add(&slave->list, &mtd_partitions);
-- 
1.9.1

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