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| author | Thomas Gleixner <tglx@linutronix.de> | 2013-02-20 14:06:20 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-03-14 11:32:04 -0700 |
| commit | 1244d244aea7290c80cea240baa7e5b93b439dc8 (patch) | |
| tree | 25b13b39df23053539f76227110df839d931010f /fs | |
| parent | 21a3473f1b9aaf7a458b43acb5237794e8cecadb (diff) | |
| download | lwn-1244d244aea7290c80cea240baa7e5b93b439dc8.tar.gz lwn-1244d244aea7290c80cea240baa7e5b93b439dc8.zip | |
btrfs: Init io_lock after cloning btrfs device struct
commit 1cba0cdf5e4dbcd9e5fa5b54d7a028e55e2ca057 upstream.
__btrfs_close_devices() clones btrfs device structs with
memcpy(). Some of the fields in the clone are reinitialized, but it's
missing to init io_lock. In mainline this goes unnoticed, but on RT it
leaves the plist pointing to the original about to be freed lock
struct.
Initialize io_lock after cloning, so no references to the original
struct are left.
Reported-and-tested-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/volumes.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 43baaf0c6749..06c8ced0cc12 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -512,6 +512,7 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) new_device->writeable = 0; new_device->in_fs_metadata = 0; new_device->can_discard = 0; + spin_lock_init(&new_device->io_lock); list_replace_rcu(&device->dev_list, &new_device->dev_list); call_rcu(&device->rcu, free_device); |