linux-kernel - [PATCH 3.16.y-ckt 018/126] mtd: mtdpart: fix add_mtd

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Message-Id: <1449653896-5236-19-git-send-email-luis.henriques@canonical.com>
Date:	Wed,  9 Dec 2015 09:36:28 +0000
From:	Luis Henriques <luis.henriques@...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>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 018/126] mtd: mtdpart: fix add_mtd_partitions error path

3.16.7-ckt21 -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: Luis Henriques <luis.henriques@...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 1ca9aec141ff..822d634b9ed5 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -637,8 +637,10 @@ 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);
--
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