xfs: abort dir/attr btree operation if btree is obviously weird

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Abort an dir/attr btree operation if the attr btree has obvious problems
like loops back to the root or pointers don't point down the tree.
Found by fuzzing btree[0].before to zero in xfs/402, which livelocks on
the cycle in the attr btree.

Apply the same checks to xfs_da3_node_lookup_int.

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

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Darrick J. Wong 2017-10-25 16:59:43 -07:00

parent bdaac93f80

commit 8210f4dda2

2 changed files with 41 additions and 1 deletions

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22

fs/xfs/libxfs/xfs_da_btree.c

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20

fs/xfs/xfs_attr_list.c

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