btrfs: fix oops on failure path
authorDaniel J Blueman <daniel.blueman@gmail.com>
Thu, 23 Jun 2011 15:01:01 +0000 (23:01 +0800)
committerDavid Sterba <dsterba@suse.cz>
Thu, 20 Oct 2011 16:10:50 +0000 (18:10 +0200)
commit068132bad1de70f85f5f6d12c36d64f8f7848d92
tree7e4a4a164b8153cf463662fbc2ce00f5671f4fa6
parent60d2adbb1e7fee1cb4bc67f70bd0bd8ace7b6c3c
btrfs: fix oops on failure path

If lookup_extent_backref fails, path->nodes[0] reasonably could be
null along with other callers of btrfs_print_leaf, so ensure we have a
valid extent buffer before dereferencing.

Signed-off-by: Daniel J Blueman <daniel.blueman@gmail.com>
fs/btrfs/print-tree.c