debugfs: fix refcount imbalance in start_creating

commit 0ee9608c89e81a1ccee52ecb58a7ff040e2522d9 upstream.

In debugfs' start_creating(), we pin the file system to safely access
its root. When we failed to create a file, we unpin the file system via
failed_creating() to release the mount count and eventually the reference
of the vfsmount.

However, when we run into an error during lookup_one_len() when still
in start_creating(), we only release the parent's mutex but not so the
reference on the mount. Looks like it was done in the past, but after
splitting portions of __create_file() into start_creating() and
end_creating() via 190afd81e4a5 ("debugfs: split the beginning and the
end of __create_file() off"), this seemed missed. Noticed during code
review.

Fixes: 190afd81e4a5 ("debugfs: split the beginning and the end of __create_file() off")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 12756040ca201db858e901b411f69aa02b6ae26d..8bec8f1e4b310d0d51630e4683d6d169ecd9dafc 100644 (file)
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -276,8 +276,12 @@ static struct dentry *start_creating(const char *name, struct dentry *parent)
                dput(dentry);
                dentry = ERR_PTR(-EEXIST);
        }
-       if (IS_ERR(dentry))
+
+       if (IS_ERR(dentry)) {
                mutex_unlock(&d_inode(parent)->i_mutex);
+               simple_release_fs(&debugfs_mount, &debugfs_mount_count);
+       }
+
        return dentry;
 }