linux-kernel - Re: [EXT] [bug report] octeontx2-af: cn10k: Uninitialized variables

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Date:   Sun, 14 Feb 2021 03:33:24 +0000
From:   Geethasowjanya Akula <gakula@...vell.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Sunil Kovvuri Goutham <sgoutham@...vell.com>,
        Linu Cherian <lcherian@...vell.com>,
        "Jerin Jacob Kollanukkaran" <jerinj@...vell.com>,
        Hariprasad Kelam <hkelam@...vell.com>,
        Subbaraya Sundeep Bhatta <sbhatta@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [EXT] [bug report] octeontx2-af: cn10k: Uninitialized variables

Hi Gustavo,

please see inline.

Thank you,
Geetha.


________________________________________
>From: Gustavo A. R. Silva <gustavoars@...nel.org>
>Sent: Saturday, February 13, 2021 12:09 AM
>To: Sunil Kovvuri Goutham; Linu Cherian; Geethasowjanya Akula; Jerin Jacob >Kollanukkaran; Hariprasad Kelam; Subbaraya Sundeep Bhatta; David S. Miller; Jakub >Kicinski
>Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Gustavo A. R. Silva
>Subject: [EXT] [bug report] octeontx2-af: cn10k: Uninitialized variables

>External Email

----------------------------------------------------------------------
>Hi,

>Variables cgx_id and lmac_id are being used uninitialized at lines 731
>and 733 in the following function:

>723 static int rvu_cgx_config_intlbk(struct rvu *rvu, u16 pcifunc, bool en)
>724 {
>725         struct mac_ops *mac_ops;
>726         u8 cgx_id, lmac_id;
>727
>728         if (!is_cgx_config_permitted(rvu, pcifunc))
>729                 return -EPERM;
>730
>731         mac_ops = get_mac_ops(rvu_cgx_pdata(cgx_id, rvu));
>732
>733         return mac_ops->mac_lmac_intl_lbk(rvu_cgx_pdata(cgx_id, rvu),
>734                                           lmac_id, en);
735 }

>This bug was introduced by commit 3ad3f8f93c81 ("octeontx2-af: cn10k: MAC internal >loopback support")

>What's the right solution for this?

Thanks Gustavo. Sorry I missed it. Below is the fix.

 static int rvu_cgx_config_intlbk(struct rvu *rvu, u16 pcifunc, bool en)
 {
+        int pf = rvu_get_pf(pcifunc);
        struct mac_ops *mac_ops;
        u8 cgx_id, lmac_id;

        if (!is_cgx_config_permitted(rvu, pcifunc))
                return -EPERM;

+       rvu_get_cgx_lmac_id(rvu->pf2cgxlmac_map[pf], &cgx_id, &lmac_id);
        mac_ops = get_mac_ops(rvu_cgx_pdata(cgx_id, rvu));


Thanks
--
Gustavo