Btrfs: add missing error code to BTRFS_IOC_INO_LOOKUP handler

If the path doesn't fit in the input buffer, return ENAMETOOLONG
instead of returning with a success code (0) and a partially
filled and right justified buffer.

Also removed useless buffer pointer check outside the while loop.

Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 317a984fe3c9..f88eeea365f3 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2030,8 +2030,10 @@ static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
                 len = btrfs_inode_ref_name_len(l, iref);
                 ptr -= len + 1;
                 total_len += len + 1;
-                if (ptr < name)
+                if (ptr < name) {
+                        ret = -ENAMETOOLONG;
                         goto out;
+                }
 
                 *(ptr + len) = '/';
                 read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len);
@@ -2044,8 +2046,6 @@ static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
                 key.offset = (u64)-1;
                 dirid = key.objectid;
         }
-        if (ptr < name)
-                goto out;
         memmove(name, ptr, total_len);
         name[total_len]='\0';
         ret = 0;