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xfs: check da node magic in _node_lookup_int

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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>
This commit is contained in:
Darrick J. Wong 2018-08-01 07:40:48 -07:00
parent 611995db2c
commit 56830d6cc1
1 changed files with 3 additions and 1 deletions
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4
fs/xfs/libxfs/xfs_da_btree.c
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@ -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.