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btrfs: Transpose btrfs_close_devices/btrfs_mapping_tree_free in close_ctree

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Following the introduction of the alloc_state tree, some of the callees
of btrfs_mapping_tree_free will have to interact with the btrfs_device
of the constituent devices. Enable this by moving the code responsible
for freeing devices after the last user (btrfs_mapping_tree_free).
Otherwise the kernel could crash due to use-after-free.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2019-02-12 16:13:14 +02:00 committed by David Sterba
parent 8e75fd893b
commit 68c94e55e1
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/disk-io.c
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@ -4040,8 +4040,8 @@ void close_ctree(struct btrfs_fs_info *fs_info)
btrfsic_unmount(fs_info->fs_devices);
#endif
btrfs_close_devices(fs_info->fs_devices);
btrfs_mapping_tree_free(&fs_info->mapping_tree);
btrfs_close_devices(fs_info->fs_devices);
percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
percpu_counter_destroy(&fs_info->delalloc_bytes);