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

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Date:   Sat, 04 May 2019 20:34:34 -0700
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     Colin King <colin.king@...onical.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 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?

James