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

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Date:   Thu, 2 Apr 2020 18:48:59 +0300
From:   Ido Schimmel <idosch@...lanox.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Jiri Pirko <jiri@...lanox.com>,
        "David S . Miller" <davem@...emloft.net>, 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

On Thu, Apr 02, 2020 at 03:48:51PM +0100, Colin King wrote:
> 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>

For net:

Reviewed-by: Ido Schimmel <idosch@...lanox.com>
Tested-by: Ido Schimmel <idosch@...lanox.com>

Thanks