Re: [PATCH 1/1] ext4: better error handling of kstrdup()

From: Taesoo Kim
Date: Fri Apr 03 2015 - 13:44:30 EST

Hi Ted,

It's my fault. I didn't properly check the case of having data = NULL
to kstrdup() as my system has long mounting options.. Sorry for the
trouble. I think there is no clean way to handle this error (better),
other than implicitly letting kstrdup() fail (and ignore).


On 04/03/15 at 01:09am, Theodore Ts'o wrote:
> On Fri, Mar 20, 2015 at 05:21:54PM -0400, Taesoo Kim wrote:
> > Upon memory pressure, kstrdup() might fail and correctly
> > handle memory error, although current implementation do not
> > refer orig_data.
> >
> > NOTE. fortunately the correct impl works, other than a
> > corner case where kstrdup() fails and kzalloc() succeeds;
> > it might record 'NULL' in the log.
> >
> > Signed-off-by: Taesoo Kim <tsgatesv@xxxxxxxxx>
> Did you test this patch? If there are no mount options (such as when
> mounting the root file system, data is NULL, so orig_data is NULL),
> and the mount fails. So a kernel won't boot with this patch applied.
> - Ted
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