linux-kernel - Re: [PATCH] nfp: abm: fix a memory leak bug

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Date:   Sun, 3 May 2020 13:30:13 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Qiushi Wu <wu000273@....edu>, netdev@...r.kernel.org,
        oss-drivers@...ronome.com
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Kangjie Lu <kjlu@....edu>
Subject: Re: [PATCH] nfp: abm: fix a memory leak bug

…
> Fix this issue by adding nfp_nsp_close(nsp) in the error path.

How do you think about a wording variant like the following?

   Subject:
   [PATCH v2] nfp: abm: Fix incomplete release of system resources in nfp_abm_vnic_set_mac()

   Change description:
   …
   Thus add a call of the function “nfp_nsp_close” for the completion
   of the exception handling.


…
> +++ b/drivers/net/ethernet/netronome/nfp/abm/main.c
> @@ -283,6 +283,7 @@  nfp_abm_vnic_set_mac(struct nfp_pf *pf, struct nfp_abm *abm, struct nfp_net *nn,
>  	if (!nfp_nsp_has_hwinfo_lookup(nsp)) {
>  		nfp_warn(pf->cpp, "NSP doesn't support PF MAC generation\n");
>  		eth_hw_addr_random(nn->dp.netdev);
> +		nfp_nsp_close(nsp);
>  		return;
>  	}

I suggest to reconsider the order for resource clean-up function calls
a bit more.

+		nfp_nsp_close(nsp);
-		eth_hw_addr_random(nn->dp.netdev);
-		return;
+		goto generate_random_address;


Should such a jump target be added in another update step?

Would you like to add the tag “Fixes”?

Regards,
Markus