netdev - Re: [PATCH] net: stmmac: gmac5+: fix potential integer overflow on 32 bit multiply

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Date:   Mon, 04 May 2020 11:57:38 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     colin.king@...onical.com
Cc:     peppe.cavallaro@...com, alexandre.torgue@...com,
        joabreu@...opsys.com, mcoquelin.stm32@...il.com,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: stmmac: gmac5+: fix potential integer overflow on
 32 bit multiply

From: Colin King <colin.king@...onical.com>
Date: Fri,  1 May 2020 15:10:16 +0100

> From: Colin Ian King <colin.king@...onical.com>
> 
> The multiplication of cfg->ctr[1] by 1000000000 is performed using a
> 32 bit multiplication (since cfg->ctr[1] is a u32) and this can lead
> to a potential overflow. Fix this by making the constant a ULL to
> ensure a 64 bit multiply occurs.
> 
> Fixes: 504723af0d85 ("net: stmmac: Add basic EST support for GMAC5+")
> Addresses-Coverity: ("Unintentional integer overflow")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Applied.