Re: [PATCH] fix Coverity braindamage in UDF

[Andrew Morton <akpm@osdl.org>]

Christoph Hellwig <hch@lst.de> wrote:
>
>  Andrew, please don't blindly apply Coverity patches.  While the checker
>  is smart at finding inconsistencies, that "obvious" fix is wrong most of
>  the item.  As in this unreviewed UDF patch that got in:
>  udf_find_entry can never be called with a NULL argument, so we shouldn't
>  check for it instead of adding more assignments behind the check.

I reviewed it.  The code as it stood was wrong and the patch corrected it.

Yes, I realised at the time that the test for null is probably redundant,
but that's a separate thing - we have many such redundant tests and perhaps
someone should do a cleanup sweep.  But I have no intention of doing that
and I don't want to be leaving obvious coding errors in there.

A similar argument applies to the patch "coverity: tty_ldisc_ref return
null check".