devpts: plug the memory leak in kill_sb
authorIlija Hadzic <ihadzic@research.bell-labs.com>
Tue, 12 Nov 2013 23:11:45 +0000 (15:11 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 13 Nov 2013 03:09:36 +0000 (12:09 +0900)
commit66da0e1f9034140ae2f571ef96e254a25083906c
tree46becb19a1991f0ed0ec2fb4d42ba69aebe79ac8
parent1bf49dd4be0b000030c6f04c4a16a17d9affdbd3
devpts: plug the memory leak in kill_sb

When devpts is unmounted, there may be a no-longer-used IDR tree hanging
off the superblock we are about to kill.  This needs to be cleaned up
before destroying the SB.

The leak is usually not a big deal because unmounting devpts is typically
done when shutting down the whole machine.  However, shutting down an LXC
container instead of a physical machine exposes the problem (the garbage
is detectable with kmemleak).

Signed-off-by: Ilija Hadzic <ihadzic@research.bell-labs.com>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/devpts/inode.c