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btrfs: use after free when closing devices

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__btrfs_close_devices() would call_rcu to free the device, which is racy with
list_for_each_entry() accessing the memory to retrieve the next device on the
list.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Sasha Levin 2015-05-12 19:31:37 -04:00 committed by Chris Mason
parent 01b810b889
commit 2037a0933b
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/volumes.c
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@ -693,13 +693,13 @@ static void free_device(struct rcu_head *head)
static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices) static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
{ {
struct btrfs_device *device; struct btrfs_device *device, *tmp;
if (--fs_devices->opened > 0) if (--fs_devices->opened > 0)
return 0; return 0;
mutex_lock(&fs_devices->device_list_mutex); mutex_lock(&fs_devices->device_list_mutex);
list_for_each_entry(device, &fs_devices->devices, dev_list) { list_for_each_entry_safe(device, tmp, &fs_devices->devices, dev_list) {
struct btrfs_device *new_device; struct btrfs_device *new_device;
struct rcu_string *name; struct rcu_string *name;