linux-kernel - Re: [PATCH][next] mlxsw: spectrum_trap: fix unintention integer overflow on left shift

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Message-Id: <20200402.180020.506846856059927664.davem@davemloft.net>
Date:   Thu, 02 Apr 2020 18:00:20 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     colin.king@...onical.com
Cc:     jiri@...lanox.com, idosch@...lanox.com, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] mlxsw: spectrum_trap: fix unintention integer
 overflow on left shift

From: Colin King <colin.king@...onical.com>
Date: Thu,  2 Apr 2020 15:48:51 +0100

> From: Colin Ian King <colin.king@...onical.com>
> 
> Shifting the integer value 1 is evaluated using 32-bit
> arithmetic and then used in an expression that expects a 64-bit
> value, so there is potentially an integer overflow. Fix this
> by using the BIT_ULL macro to perform the shift and avoid the
> overflow.
> 
> Addresses-Coverity: ("Unintentional integer overflow")
> Fixes: 13f2e64b94ea ("mlxsw: spectrum_trap: Add devlink-trap policer support")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Applied, thanks.