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

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Message-ID: <20150403050943.GB9988@thunk.org>
Date:	Fri, 3 Apr 2015 01:09:43 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Taesoo Kim <tsgatesv@...il.com>
Cc:	adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, taesoo@...ech.edu,
	changwoo@...ech.edu, sanidhya@...ech.edu, blee@...ech.edu,
	csong84@...ech.edu
Subject: Re: [PATCH 1/1] ext4: better error handling of kstrdup()

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@...il.com>

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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