linux-kernel - Re: [PATCH] mptsas: fix undefined behaviour of a shift of an int by more than 31 places

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Message-ID: <de7e3aaf-0155-5007-c228-510f0d0de428@canonical.com>
Date:   Wed, 8 May 2019 14:07:16 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     James Bottomley <James.Bottomley@...senPartnership.com>,
        Sathya Prakash <sathya.prakash@...adcom.com>,
        Chaitra P B <chaitra.basappa@...adcom.com>,
        Suganath Prabu Subramani 
        <suganath-prabu.subramani@...adcom.com>,
        MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mptsas: fix undefined behaviour of a shift of an int by
 more than 31 places

On 05/05/2019 04:34, James Bottomley wrote:
> On Sat, 2019-05-04 at 17:40 +0100, Colin King wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> Currently the shift of int value 1 by more than 31 places can result
>> in undefined behaviour. Fix this by making the 1 a ULL value before
>> the shift operation.
> 
> Fusion SAS is pretty ancient.  I thought the largest one ever produced
> had four phys, so how did you produce the overflow?

This was an issue found by static analysis with Coverity; so I guess
won't happen in the wild, in which case the patch could be ignored.

Colin

> 
> James
>