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xfs: convert a few more directory asserts to corruption

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Yet another round of playing whack-a-mole with directory code that
asserts on corrupt on-disk metadata when it really should be returning
-EFSCORRUPTED instead of ASSERTing.  Found by a xfs/391 crash while
lastbit fuzzing of ltail.bestcount.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong 2018-03-06 17:08:31 -08:00
parent 8241f7f983
commit 3f883f5bb1
2 changed files with 5 additions and 3 deletions
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3
fs/xfs/libxfs/xfs_dir2_leaf.c
View file

@ -1415,7 +1415,8 @@ xfs_dir2_leaf_removename(
oldbest = be16_to_cpu(bf[0].length);
ltp = xfs_dir2_leaf_tail_p(args->geo, leaf);
bestsp = xfs_dir2_leaf_bests_p(ltp);
ASSERT(be16_to_cpu(bestsp[db]) == oldbest);
if (be16_to_cpu(bestsp[db]) != oldbest)
return -EFSCORRUPTED;
/*
* Mark the former data entry unused.
*/

5
fs/xfs/libxfs/xfs_dir2_node.c
View file

@ -387,8 +387,9 @@ xfs_dir2_leaf_to_node(
dp->d_ops->free_hdr_from_disk(&freehdr, free);
leaf = lbp->b_addr;
ltp = xfs_dir2_leaf_tail_p(args->geo, leaf);
ASSERT(be32_to_cpu(ltp->bestcount) <=
(uint)dp->i_d.di_size / args->geo->blksize);
if (be32_to_cpu(ltp->bestcount) >
(uint)dp->i_d.di_size / args->geo->blksize)
return -EFSCORRUPTED;
/*
* Copy freespace entries from the leaf block to the new block.