From 8f71f3e0e4fb5a2445fb93d3057a33aefc4aa30d Mon Sep 17 00:00:00 2001 From: Liu Bo Date: Mon, 4 Mar 2013 16:25:36 +0000 Subject: [PATCH] Btrfs: check for NULL pointer in updating reloc roots Add a check for NULL pointer to avoid invalid reference. Signed-off-by: Liu Bo Signed-off-by: Josef Bacik --- fs/btrfs/relocation.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index ba5a3210da9a..16e0c6fbdbed 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -1269,6 +1269,8 @@ static int __update_reloc_root(struct btrfs_root *root, int del) } spin_unlock(&rc->reloc_root_tree.lock); + if (!node) + return 0; BUG_ON((struct btrfs_root *)node->data != root); if (!del) { -- 2.20.1