linux-kernel - Re: [PATCH] net: stmmac_tc: use 64-bit arithmetic instead of 32-bit

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Message-ID: <32c70751-9083-5c59-1e0e-c4ba69c18d80@synopsys.com>
Date:   Mon, 2 Jul 2018 16:19:23 +0100
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        "Jose Abreu" <Jose.Abreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: stmmac_tc: use 64-bit arithmetic instead of 32-bit

On 02-07-2018 13:09, Gustavo A. R. Silva wrote:
> Add suffix UL to constant 1024 in order to give the compiler complete
> information about the proper arithmetic to use. Notice that this
> constant is used in a context that expects an expression of type
> u64 (64 bits, unsigned) and  following expressions are currently
> being evaluated using 32-bit arithmetic:
>
> qopt->idleslope * 1024 * ptr
> qopt->hicredit * 1024 * 8
> qopt->locredit * 1024 * 8
>
> Addresses-Coverity-ID: 1470246 ("Unintentional integer overflow")
> Addresses-Coverity-ID: 1470248 ("Unintentional integer overflow")
> Addresses-Coverity-ID: 1470249 ("Unintentional integer overflow")
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
>

Acked-by: Jose Abreu <joabreu@...opsys.com>

Thanks!

Best Regards,
Jose Miguel Abreu