From: Darrick J. Wong <darrick.wong@oracle.com>
Date: Wed, 1 Aug 2018 14:40:48 +0000 (-0700)
Subject: xfs: check da node magic in _node_lookup_int
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=56830d6cc114f76f656d5e65ab355b070d5a695e;p=openwrt%2Fstaging%2Fblogic.git

xfs: check da node magic in _node_lookup_int

Before we start processing what we /think/ is a da3 node block, actually
check the magic to make sure that we're looking at a node block.  This
way we won't blow the asserts in _node_hdr_from_disk on corrupted
metadata.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
---

diff --git a/fs/xfs/libxfs/xfs_da_btree.c b/fs/xfs/libxfs/xfs_da_btree.c
index 8ffe17b223da..376bee94b5dd 100644
--- a/fs/xfs/libxfs/xfs_da_btree.c
+++ b/fs/xfs/libxfs/xfs_da_btree.c
@@ -1523,8 +1523,10 @@ xfs_da3_node_lookup_int(
 			break;
 		}
 
-		blk->magic = XFS_DA_NODE_MAGIC;
+		if (magic != XFS_DA_NODE_MAGIC && magic != XFS_DA3_NODE_MAGIC)
+			return -EFSCORRUPTED;
 
+		blk->magic = XFS_DA_NODE_MAGIC;
 
 		/*
 		 * Search an intermediate node for a match.