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xfs: fix btree scrub deref check

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The btree scrubber has some custom code to retrieve and check a btree
block via xfs_btree_lookup_get_block.  This function will either return
an error code (verifiers failed) or a *pblock will be untouched (bad
pointer).  Since we previously set *pblock to NULL, we need to check
*pblock, not pblock, to trigger the early bailout.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2017-11-06 12:09:29 -08:00
parent 72f76f7364
commit a605e86912
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/scrub/btree.c
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@ -335,7 +335,7 @@ xfs_scrub_btree_get_block(
error = xfs_btree_lookup_get_block(bs->cur, level, pp, pblock);
if (!xfs_scrub_btree_process_error(bs->sc, bs->cur, level, &error) ||
!pblock)
!*pblock)
return error;
xfs_btree_get_block(bs->cur, level, pbp);