From fbb0ce40d6064e731b5976f10e91ce7b9683df1f Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Fri, 24 Jan 2020 09:32:52 -0500 Subject: btrfs: hold a ref on the root in btrfs_check_uuid_tree_entry We lookup the uuid of arbitrary subvolumes, hold a ref on the root while we're doing this. Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/volumes.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 0b3167bd9f35..3fca9f9e3b5d 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -4431,6 +4431,10 @@ static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info *fs_info, ret = 1; goto out; } + if (!btrfs_grab_fs_root(subvol_root)) { + ret = 1; + goto out; + } switch (type) { case BTRFS_UUID_KEY_SUBVOL: @@ -4443,7 +4447,7 @@ static int btrfs_check_uuid_tree_entry(struct btrfs_fs_info *fs_info, ret = 1; break; } - + btrfs_put_fs_root(subvol_root); out: return ret; } -- cgit v1.2.3