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| author | Dan Williams <dan.j.williams@intel.com> | 2017-03-17 12:48:09 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-21 06:44:32 +0100 |
| commit | ed01e50acdd3e4a640cf9ebd28a7e810c3ceca97 (patch) | |
| tree | 831c42c463fbf11a2e6da50ab68b5e8854de68c2 /kernel | |
| parent | 233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 (diff) | |
| download | linux-ed01e50acdd3e4a640cf9ebd28a7e810c3ceca97.tar.bz2 | |
device-dax: fix cdev leak
If device_add() fails, cleanup the cdev. Otherwise, we leak a kobj_map()
with a stale device number.
As Jason points out, there is a small possibility that userspace has
opened and mapped the device in the time between cdev_add() and the
device_add() failure. We need a new kill_dax_dev() helper to invalidate
any established mappings.
Fixes: ba09c01d2fa8 ("dax: convert to the cdev api")
Cc: <stable@vger.kernel.org>
Reported-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions