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xfs: rework refcount cow recovery error handling 

The error handling in xfs_refcount_recover_cow_leftovers is confused
and can potentially leak memory, so rework it to release resources
correctly on error.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reported-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong 2016-10-10 17:23:07 +11:00 committed by Dave Chinner
parent 1987fd7434
commit 6f97077ff6
1 changed files with 9 additions and 11 deletions
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20
fs/xfs/libxfs/xfs_refcount.c
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@ -1643,7 +1643,7 @@ xfs_refcount_recover_cow_leftovers(
error = xfs_btree_query_range(cur, &low, &high,
xfs_refcount_recover_extent, &debris);
if (error)
goto out_error;
goto out_cursor;
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
xfs_buf_relse(agbp);
@ -1675,14 +1675,8 @@ xfs_refcount_recover_cow_leftovers(
error = xfs_trans_commit(tp);
if (error)
goto out_cancel;
goto out_free;
}
goto out_free;
out_defer:
xfs_defer_cancel(&dfops);
out_cancel:
xfs_trans_cancel(tp);
out_free:
/* Free the leftover list */
@ -1690,11 +1684,15 @@ out_free:
list_del(&rr->rr_list);
kmem_free(rr);
}
return error;
out_error:
out_cursor:
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
xfs_buf_relse(agbp);
return error;
goto out_free;
out_defer:
xfs_defer_cancel(&dfops);
xfs_trans_cancel(tp);
goto out_free;
}