linux-kernel - RE: [Intel-wired-lan] [PATCH][next] ice: Fix potential infinite loop when using u8 loop counter

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Message-ID: <CO1PR11MB51053F26FD4F24B78969B0F3FA749@CO1PR11MB5105.namprd11.prod.outlook.com>
Date:   Thu, 8 Apr 2021 19:44:08 +0000
From:   "Brelinski, TonyX" <tonyx.brelinski@...el.com>
To:     Colin King <colin.king@...onical.com>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "David S . Miller" <davem@...emloft.net>,
        "Jakub Kicinski" <kuba@...nel.org>,
        "Cao, Chinh T" <chinh.t.cao@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Intel-wired-lan] [PATCH][next] ice: Fix potential infinite loop
 when using u8 loop counter

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
> Colin King
> Sent: Wednesday, March 31, 2021 7:46 AM
> To: Brandeburg, Jesse <jesse.brandeburg@...el.com>; Nguyen, Anthony L
> <anthony.l.nguyen@...el.com>; David S . Miller <davem@...emloft.net>;
> Jakub Kicinski <kuba@...nel.org>; Cao, Chinh T <chinh.t.cao@...el.com>;
> intel-wired-lan@...ts.osuosl.org; netdev@...r.kernel.org
> Cc: kernel-janitors@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [Intel-wired-lan] [PATCH][next] ice: Fix potential infinite loop when
> using u8 loop counter
> 
> From: Colin Ian King <colin.king@...onical.com>
> 
> A for-loop is using a u8 loop counter that is being compared to a u32
> cmp_dcbcfg->numapp to check for the end of the loop. If cmp_dcbcfg-
> >numapp is larger than 255 then the counter j will wrap around to zero and
> hence an infinite loop occurs. Fix this by making counter j the same type as
> cmp_dcbcfg->numapp.
> 
> Addresses-Coverity: ("Infinite loop")
> Fixes: aeac8ce864d9 ("ice: Recognize 860 as iSCSI port in CEE mode")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_dcb.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Tested-by: Tony Brelinski <tonyx.brelinski@...el.com> A Contingent Worker at Intel