netdev - Re: [PATCH][next] net/tls: fix sign extension issue when left shifting u16 value

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Message-Id: <20200630.133712.641790280086952744.davem@davemloft.net>
Date:   Tue, 30 Jun 2020 13:37:12 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     colin.king@...onical.com
Cc:     borisp@...lanox.com, aviadye@...lanox.com,
        john.fastabend@...il.com, daniel@...earbox.net, kuba@...nel.org,
        tariqt@...lanox.com, saeedm@...lanox.com, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] net/tls: fix sign extension issue when left
 shifting u16 value

From: Colin King <colin.king@...onical.com>
Date: Tue, 30 Jun 2020 15:27:46 +0100

> From: Colin Ian King <colin.king@...onical.com>
> 
> Left shifting the u16 value promotes it to a int and then it
> gets sign extended to a u64.  If len << 16 is greater than 0x7fffffff
> then the upper bits get set to 1 because of the implicit sign extension.
> Fix this by casting len to u64 before shifting it.
> 
> Addresses-Coverity: ("integer handling issues")
> Fixes: ed9b7646b06a ("net/tls: Add asynchronous resync")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Applied, thanks Colin.