netdev - Re: [PATCH 10/22] bnx2x: fix format overflow warning

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Date:   Fri, 14 Jul 2017 09:03:46 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     arnd@...db.de
Cc:     linux-kernel@...r.kernel.org, Yuval.Mintz@...ium.com,
        ariel.elior@...ium.com, everest-linux-l2@...ium.com,
        gregkh@...uxfoundation.org, torvalds@...ux-foundation.org,
        linux@...ck-us.net, akpm@...ux-foundation.org,
        netdev@...r.kernel.org, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        x86@...nel.org, colin.king@...onical.com, tremyfr@...il.com
Subject: Re: [PATCH 10/22] bnx2x: fix format overflow warning

From: Arnd Bergmann <arnd@...db.de>
Date: Fri, 14 Jul 2017 14:07:02 +0200

> gcc notices that large queue numbers would overflow the queue name
> string:
> 
> drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c: In function 'bnx2x_get_strings':
> drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c:3165:25: error: '%d' directive writing between 1 and 10 bytes into a region of size 5 [-Werror=format-overflow=]
> drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c:3165:25: note: directive argument in the range [0, 2147483647]
> drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c:3165:5: note: 'sprintf' output between 2 and 11 bytes into a destination of size 5
> 
> There is a hard limit in place that makes the number at most two
> digits, so the code is fine. This changes it to use snprintf()
> to truncate instead of overflowing, which shuts up that warning.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied.