netdev - RE: [Intel-wired-lan] [PATCH v3] igb: Fix string truncation warnings in igb_set_fw

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Message-ID: <CYYPR11MB8429A8C895A5F4F58CFFB5E4BD402@CYYPR11MB8429.namprd11.prod.outlook.com>
Date: Sun, 4 Feb 2024 06:39:19 +0000
From: "Pucha, HimasekharX Reddy" <himasekharx.reddy.pucha@...el.com>
To: Kunwu Chan <chentao@...inos.cn>, "Brandeburg, Jesse"
	<jesse.brandeburg@...el.com>, "Nguyen, Anthony L"
	<anthony.l.nguyen@...el.com>, "davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "kuba@...nel.org"
	<kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>
CC: Kunwu Chan <kunwu.chan@...mail.com>, "Kitszel, Przemyslaw"
	<przemyslaw.kitszel@...el.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "intel-wired-lan@...ts.osuosl.org"
	<intel-wired-lan@...ts.osuosl.org>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "Keller, Jacob E" <jacob.e.keller@...el.com>
Subject: RE: [Intel-wired-lan] [PATCH v3] igb: Fix string truncation warnings
 in igb_set_fw_version

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of Kunwu Chan
> Sent: Monday, January 15, 2024 1:58 PM
> To: Brandeburg, Jesse <jesse.brandeburg@...el.com>; Nguyen, Anthony L <anthony.l.nguyen@...el.com>; davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com
> Cc: Kunwu Chan <chentao@...inos.cn>; Kunwu Chan <kunwu.chan@...mail.com>; Kitszel, Przemyslaw <przemyslaw.kitszel@...el.com>; linux-kernel@...r.kernel.org; intel-wired-lan@...ts.osuosl.org; netdev@...r.kernel.org; Keller, Jacob E <jacob.e.keller@...el.com>
> Subject: [Intel-wired-lan] [PATCH v3] igb: Fix string truncation warnings in igb_set_fw_version
>
> Commit 1978d3ead82c ("intel: fix string truncation warnings")
> fixes '-Wformat-truncation=' warnings in igb_main.c by using kasprintf.
>
> drivers/net/ethernet/intel/igb/igb_main.c:3092:53: warning：‘%d’ directive output may be truncated writing between 1 and 5 bytes into a region of size between 1 and 13 [-Wformat-truncation=]
>  3092 |                                  "%d.%d, 0x%08x, %d.%d.%d",
>       |                                                     ^~
> drivers/net/ethernet/intel/igb/igb_main.c:3092:34: note：directive argument in the range [0, 65535]
>  3092 |                                  "%d.%d, 0x%08x, %d.%d.%d",
>       |                                  ^~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/net/ethernet/intel/igb/igb_main.c:3092:34: note：directive argument in the range [0, 65535]
> drivers/net/ethernet/intel/igb/igb_main.c:3090:25: note：‘snprintf’ output between 23 and 43 bytes into a destination of size 32
>
> kasprintf() returns a pointer to dynamically allocated memory
> which can be NULL upon failure.
>
> Fix this warning by using a larger space for adapter->fw_version,
> and then fall back and continue to use snprintf.
>
> Fixes: 1978d3ead82c ("intel: fix string truncation warnings")
> Signed-off-by: Kunwu Chan <chentao@...inos.cn>
> Cc: Kunwu Chan <kunwu.chan@...mail.com>
> Suggested-by: Jakub Kicinski <kuba@...nel.org>
> ---
> v2: Fall back to use snprintf and a larger space,as suggested by
> https://lore.kernel.org/all/20231212132637.1b0fb8aa@kernel.org/
> v3: Add detailed warnings to the commit msg ,no functional change
> ---
>  drivers/net/ethernet/intel/igb/igb.h      |  2 +-
>  drivers/net/ethernet/intel/igb/igb_main.c | 35 ++++++++++++-----------
>  2 files changed, 19 insertions(+), 18 deletions(-)
>

Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com> (A Contingent worker at Intel)