From bdf70b9e75f54a04941dc450abe61694e03fead4 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Fri, 24 Jan 2020 09:32:29 -0500 Subject: [PATCH] btrfs: hold a root ref in btrfs_get_dentry Looking up the inode we need to search the root, make sure we hold a reference on that root while we're doing the lookup. Signed-off-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/export.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c index 08cd8c4a02a5..eba6c6d27bad 100644 --- a/fs/btrfs/export.c +++ b/fs/btrfs/export.c @@ -82,12 +82,17 @@ static struct dentry *btrfs_get_dentry(struct super_block *sb, u64 objectid, err = PTR_ERR(root); goto fail; } + if (!btrfs_grab_fs_root(root)) { + err = -ENOENT; + goto fail; + } key.objectid = objectid; key.type = BTRFS_INODE_ITEM_KEY; key.offset = 0; inode = btrfs_iget(sb, &key, root); + btrfs_put_fs_root(root); if (IS_ERR(inode)) { err = PTR_ERR(inode); goto fail; -- 2.11.0