linux-kernel - Re: [PATCH] fs: ocfs2: dir.c: Cleaning up uninitialized variables

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Message-ID: <CAFo99gZciEQSNOHw0wVQ8ETTjk87+E2=8uO5vwRkTm6HuqDPsw@mail.gmail.com>
Date:	Tue, 3 Jun 2014 00:03:27 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mark Fasheh <mfasheh@...e.com>, Joel Becker <jlbec@...lplan.org>,
	ocfs2-devel@....oracle.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fs: ocfs2: dir.c: Cleaning up uninitialized variables

Hi

Yes, but if() above, there may be a:
goto out;

Or if kcalloc() fails in ocfs2_dx_dir_kmalloc_leaves() the variable
num_dx_leaves will not be set to any value.

But now that I look more carefully at it, I see that in the cases
orig_dx_leaves and new_dx_leaves ar NULL, so nothing will happen in
the out: part of the code.

Sorry about this :-(


Best regards
Rickard Strandqvist


2014-06-02 22:22 GMT+02:00 Andrew Morton <akpm@...ux-foundation.org>:
> On Sun,  1 Jun 2014 15:53:04 +0200 Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se> wrote:
>
>> There is a risk that the variable will be used without being initialized.
>
> um, no there isn't.
>
>> --- a/fs/ocfs2/dir.c
>> +++ b/fs/ocfs2/dir.c
>> @@ -3738,7 +3738,7 @@ static int ocfs2_dx_dir_rebalance(struct ocfs2_super *osb, struct inode *dir,
>>       int credits, ret, i, num_used, did_quota = 0;
>>       u32 cpos, split_hash, insert_hash = hinfo->major_hash;
>>       u64 orig_leaves_start;
>> -     int num_dx_leaves;
>> +     int num_dx_leaves = 0;
>>       struct buffer_head **orig_dx_leaves = NULL;
>>       struct buffer_head **new_dx_leaves = NULL;
>>       struct ocfs2_alloc_context *data_ac = NULL, *meta_ac = NULL;
>
> If ocfs2_dx_dir_kmalloc_leaves() returns non-zero, num_dx_leaves will
> have been initialized.
>
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