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| author | Ilija Hadzic <ihadzic@research.bell-labs.com> | 2013-11-12 15:11:45 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-13 12:09:36 +0900 |
| commit | 66da0e1f9034140ae2f571ef96e254a25083906c (patch) | |
| tree | 46becb19a1991f0ed0ec2fb4d42ba69aebe79ac8 /fs/devpts/inode.c | |
| parent | 1bf49dd4be0b000030c6f04c4a16a17d9affdbd3 (diff) | |
| download | lwn-66da0e1f9034140ae2f571ef96e254a25083906c.tar.gz lwn-66da0e1f9034140ae2f571ef96e254a25083906c.zip | |
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>
Diffstat (limited to 'fs/devpts/inode.c')
| -rw-r--r-- | fs/devpts/inode.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c index 073d30b9d1ac..a726b9f29cb7 100644 --- a/fs/devpts/inode.c +++ b/fs/devpts/inode.c @@ -498,6 +498,7 @@ static void devpts_kill_sb(struct super_block *sb) { struct pts_fs_info *fsi = DEVPTS_SB(sb); + ida_destroy(&fsi->allocated_ptys); kfree(fsi); kill_litter_super(sb); } |