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xfs: add missing bmap cancel calls in error paths

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If a failure occurs after the bmap free list is populated and before
xfs_bmap_finish() completes successfully (which returns a partial
list on failure), the bmap free list must be cancelled. Otherwise,
the extent items on the list are never freed and a memory leak
occurs.

Several random error paths throughout the code suffer this problem.
Fix these up such that xfs_bmap_cancel() is always called on error.

Signed-off-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:
Brian Foster 2015-08-19 10:01:40 +10:00 • committed by Dave Chinner
parent 146e54b71e
commit d4a97a0422
4 changed files with 41 additions and 36 deletions
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10
fs/xfs/xfs_bmap_util.c
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@ -1474,7 +1474,7 @@ xfs_shift_file_space(
XFS_DIOSTRAT_SPACE_RES(mp, 0), 0,
XFS_QMOPT_RES_REGBLKS);
if (error)
goto out;
goto out_trans_cancel;
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
@ -1488,18 +1488,20 @@ xfs_shift_file_space(
&done, stop_fsb, &first_block, &free_list,
direction, XFS_BMAP_MAX_SHIFT_EXTENTS);
if (error)
goto out;
goto out_bmap_cancel;
error = xfs_bmap_finish(&tp, &free_list, &committed);
if (error)
goto out;
goto out_bmap_cancel;
error = xfs_trans_commit(tp);
}
return error;
out:
out_bmap_cancel:
xfs_bmap_cancel(&free_list);
out_trans_cancel:
xfs_trans_cancel(tp);
return error;
}