linux-kernel - RE: [PATCH] ice: ice_sched: fix an incorrect NULL check on list iterator

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Date:   Mon, 2 May 2022 08:17:32 +0000
From:   "G, GurucharanX" <gurucharanx.g@...el.com>
To:     "Keller, Jacob E" <jacob.e.keller@...el.com>,
        Xiaomeng Tong <xiam0nd.tong@...il.com>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Raj, Victor" <victor.raj@...el.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "davem@...emloft.net" <davem@...emloft.net>
Subject: RE: [PATCH] ice: ice_sched: fix an incorrect NULL check on list
 iterator



-----Original Message-----
> From: Xiaomeng Tong <xiam0nd.tong@...il.com>
> Sent: Saturday, March 26, 2022 11:44 PM
> To: Brandeburg, Jesse <jesse.brandeburg@...el.com>
> Cc: Nguyen, Anthony L <anthony.l.nguyen@...el.com>;
> davem@...emloft.net; kuba@...nel.org; pabeni@...hat.com; Raj, Victor
> <victor.raj@...el.com>; intel- wired-lan@...ts.osuosl.org;
> netdev@...r.kernel.org; linux- kernel@...r.kernel.org; Xiaomeng Tong
> <xiam0nd.tong@...il.com>; stable@...r.kernel.org
> Subject: [PATCH] ice: ice_sched: fix an incorrect NULL check on list
> iterator
>
> The bugs are here:
> 	if (old_agg_vsi_info)
> 	if (old_agg_vsi_info && !old_agg_vsi_info->tc_bitmap[0]) {
>
> The list iterator value 'old_agg_vsi_info' will *always* be set and
> non-NULL by list_for_each_entry_safe(), so it is incorrect to assume
> that the iterator value will be NULL if the list is empty or no
> element found (in this case, the check 'if (old_agg_vsi_info)' will
> always be true unexpectly).
>
> To fix the bug, use a new variable 'iter' as the list iterator, while
> use the original variable 'old_agg_vsi_info' as a dedicated pointer to
> point to the found element.
>

Yep. This looks correct to me.

> Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
> 
> Thanks,
> Jake

> Cc: stable@...r.kernel.org
> Fixes: 37c592062b16d ("ice: remove the VSI info from previous agg")
> Signed-off-by: Xiaomeng Tong <xiam0nd.tong@...il.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_sched.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>

Tested-by: Gurucharan <gurucharanx.g@...el.com> (A Contingent worker at Intel)