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btrfs: restore active device pointers after failed sprout

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btrfs_init_new_device() switches latest_dev and possibly s_bdev from the
seed device to the new sprout device before creating the first writable
chunks.

If chunk creation or the subsequent sprout setup fails, the error path
releases the new device without switching those pointers back.
btrfs_show_devname() can then dereference the freed latest_dev and crash.

Restore the active device pointers to the latest seed device before
removing and releasing the failed sprout device.

Fixes: b7cb29e666 ("btrfs: update latest_dev when we create a sprout device")
Assisted-by: Codex:gpt-5
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Guanghui Yang <3497809730@qq.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Guanghui Yang 2026-08-10 20:16:05 +08:00 committed by David Sterba
parent c93b3c43df
commit e0b54613aa
1 changed files with 2 additions and 0 deletions
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2
fs/btrfs/volumes.c
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@ -3035,6 +3035,8 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
error_sysfs:
btrfs_sysfs_remove_device(device);
mutex_lock(&fs_info->fs_devices->device_list_mutex);
if (seeding_dev)
btrfs_assign_next_active_device(device, seed_devices->latest_dev);
mutex_lock(&fs_info->chunk_mutex);
if (!list_empty(&device->post_commit_list))
list_del_init(&device->post_commit_list);