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btrfs: hold a ref on the root in btrfs_check_uuid_tree_entry

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We lookup the uuid of arbitrary subvolumes, hold a ref on the root while
we're doing this.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2020-01-24 09:32:52 -05:00 committed by David Sterba
parent ca2037fba6
commit fbb0ce40d6
1 changed files with 5 additions and 1 deletions
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6
fs/btrfs/volumes.c
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@ -4431,6 +4431,10 @@ static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info *fs_info,
ret = 1; ret = 1;
goto out; goto out;
} }
if (!btrfs_grab_fs_root(subvol_root)) {
ret = 1;
goto out;
}
switch (type) { switch (type) {
case BTRFS_UUID_KEY_SUBVOL: case BTRFS_UUID_KEY_SUBVOL:
@ -4443,7 +4447,7 @@ static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info *fs_info,
ret = 1; ret = 1;
break; break;
} }
btrfs_put_fs_root(subvol_root);
out: out:
return ret; return ret;
} }