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

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Message-Id: <20180703.232129.1258523191108623986.davem@davemloft.net>
Date:   Tue, 03 Jul 2018 23:21:29 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     gustavo@...eddedor.com
Cc:     peppe.cavallaro@...com, alexandre.torgue@...com,
        joabreu@...opsys.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: stmmac_tc: use 64-bit arithmetic instead of 32-bit

From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Date: Mon, 2 Jul 2018 07:09:32 -0500

> 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>

Applied.