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xfs: fix btree scrub checking with regards to root-in-inode 

In xchk_btree_check_owner, we can be passed a null buffer pointer.  This
should only happen for the root of a root-in-inode btree type, but we
should program defensively in case the btree cursor state ever gets
screwed up and we get a null buffer anyway.

Coverity-id: 1438713
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 2019-03-19 08:16:22 -07:00
parent 228de124f2
commit a72e9d8d69
1 changed files with 10 additions and 1 deletions
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11
fs/xfs/scrub/btree.c
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@ -415,8 +415,17 @@ xchk_btree_check_owner(
struct xfs_btree_cur *cur = bs->cur;
struct check_owner *co;
if ((cur->bc_flags & XFS_BTREE_ROOT_IN_INODE) && bp == NULL)
/*
* In theory, xfs_btree_get_block should only give us a null buffer
* pointer for the root of a root-in-inode btree type, but we need
* to check defensively here in case the cursor state is also screwed
* up.
*/
if (bp == NULL) {
if (!(cur->bc_flags & XFS_BTREE_ROOT_IN_INODE))
xchk_btree_set_corrupt(bs->sc, bs->cur, level);
return 0;
}
/*
* We want to cross-reference each btree block with the bnobt