linux-kernel - Re: [PATCH v3 03/15] NTB: Fix UB/bug in ntb_mw_get

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Message-ID: <26ca1ce6-c4b9-818f-7b12-994bf8ae7e50@deltatee.com>
Date:   Tue, 5 Dec 2017 16:38:18 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Serge Semin <fancer.lancer@...il.com>, jdmason@...zu.us,
        dave.jiang@...el.com, Allen.Hubbe@....com,
        Shyam-sundar.S-k@....com, Xiangliang.Yu@....com, gary.hook@....com
Cc:     linux-ntb@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 03/15] NTB: Fix UB/bug in ntb_mw_get_align()



On 05/12/17 03:39 PM, Serge Semin wrote:
> Simple (1 << pidx) operation causes undefined behaviour when
> pidx >= 32. It must be casted to u64 to match the actual return
> value of ntb_link_is_up() method, so to have all the possible
> peer indexes covered and to get rid of undefined behaviour.
> Additionally there are special macros in "linux/bitops.h" to perform
> the bit-set-shift operations, so it's recommended to have them used
> for proper bit setting.
> 
> Signed-off-by: Serge Semin <fancer.lancer@...il.com>

Looks like you dropped my reviewed by tag for some reason.

Reviewed-by: Logan Gunthorpe <logang@...tatee.com>