From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yuanhan Liu Subject: [PATCH] md: check the return of mddev_find() Date: Tue, 15 May 2012 14:26:40 +0800 Message-ID: <1337063200-11174-1-git-send-email-yuanhan.liu@linux.intel.com> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: neilb@suse.de, linux-raid@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Yuanhan Liu List-Id: linux-raid.ids Check the return of mddev_find(), since it may fail due to out of memeory or out of usable minor number. The reason I chose -ENODEV instead of -ENOMEM or something else is md_alloc() function chose that ;) Signed-off-by: Yuanhan Liu --- drivers/md/md.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index 477eb2e..0bd44e3 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -6371,6 +6371,9 @@ static int md_open(struct block_device *bdev, fmode_t mode) struct mddev *mddev = mddev_find(bdev->bd_dev); int err; + if (!mddev) + return -ENODEV; + if (mddev->gendisk != bdev->bd_disk) { /* we are racing with mddev_put which is discarding this * bd_disk. -- 1.7.7.6