linux-kernel - Re: [PATCH] mm: initialize return of vm_insert

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Message-ID: <7b6eb14b-bbdc-dedb-c989-5e705cb9a453@redhat.com>
Date:   Fri, 3 Jul 2020 08:46:30 -0700
From:   Tom Rix <trix@...hat.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: initialize return of vm_insert_pages


On 7/3/20 7:54 AM, Matthew Wilcox wrote:
> On Fri, Jul 03, 2020 at 07:52:02AM -0700, trix@...hat.com wrote:
>> From: Tom Rix <trix@...hat.com>
>>
>> clang static analysis reports a garbage return
>>
>> In file included from mm/memory.c:84:
>> mm/memory.c:1612:2: warning: Undefined or garbage value returned to caller [core.uninitialized.UndefReturn]
>>         return err;
>>         ^~~~~~~~~~
>>
>> The setting of err depends on a loop executing.
>> So initialize err.
> I'd argue that returning zero is wrong.  If someone's asked to insert
> zero pages, that's a nonsense thing to do so it should return -EINVAL..
>
good point, i'll respin.