linux-kernel - Re: [PATCH][next] mlxsw: spectrum: fix uninitialized value in err

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Message-Id: <20171001.230620.73466517361012407.davem@davemloft.net>
Date:   Sun, 01 Oct 2017 23:06:20 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     colin.king@...onical.com
Cc:     jiri@...lanox.com, idosch@...lanox.com, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] mlxsw: spectrum: fix uninitialized value in err

From: Colin King <colin.king@...onical.com>
Date: Sun,  1 Oct 2017 17:27:35 +0100

> From: Colin Ian King <colin.king@...onical.com>
> 
> In the unlikely event that mfc->mfc_un.res.ttls[i] is 255 for all
> values of i from 0 to MAXIVS-1, the err is not set at all and hence
> has a garbage value on the error return at the end of the function,
> so initialize it to 0.  Also, the error return check on err and goto
> to err: inside the for loop makes it impossible for err to be zero
> at the end of the for loop, so we can remove the redundant err check
> at the end of the loop.
> 
> Detected by CoverityScan CID#1457207 ("Unitialized scalar value")
> 
> Fixes: c011ec1bbfd6 ("mlxsw: spectrum: Add the multicast routing offloading logic")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Applied.