Btrfs: use right type to get real comparison

commit cd857dd6bc2ae9ecea14e75a34e8a8fdc158e307 upstream.

We want to make sure the point is still within the extent item, not to verify
the memory it's pointing to.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 290e347b6db3f925f414fd9be4e6ea394da6f887..75386cb004afa391f9178836ceb99d0b802dce00 100644 (file)
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1366,7 +1366,7 @@ static int __get_extent_inline_ref(unsigned long *ptr, struct extent_buffer *eb,
                        *out_eiref = (struct btrfs_extent_inline_ref *)(ei + 1);
                }
                *ptr = (unsigned long)*out_eiref;
-               if ((void *)*ptr >= (void *)ei + item_size)
+               if ((unsigned long)(*ptr) >= (unsigned long)ei + item_size)
                        return -ENOENT;
        }