linux-kernel - Re: [PATCH v5 1/1] powerpc/pseries: Interface to represent PAPR firmware attributes

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Date:   Mon, 19 Jul 2021 16:09:44 -0300
From:   Fabiano Rosas <farosas@...ux.ibm.com>
To:     "Pratik R. Sampat" <psampat@...ux.ibm.com>, mpe@...erman.id.au,
        benh@...nel.crashing.org, paulus@...ba.org,
        linuxppc-dev@...ts.ozlabs.org, kvm-ppc@...r.kernel.org,
        linux-kernel@...r.kernel.org, psampat@...ux.ibm.com,
        pratik.r.sampat@...il.com
Subject: Re: [PATCH v5 1/1] powerpc/pseries: Interface to represent PAPR
 firmware attributes

"Pratik R. Sampat" <psampat@...ux.ibm.com> writes:

> +	pgs = kcalloc(num_attrs, sizeof(*pgs), GFP_KERNEL);
> +	if (!pgs)
> +		goto out;
> +
> +	papr_kobj = kobject_create_and_add("papr", firmware_kobj);
> +	if (!papr_kobj) {
> +		pr_warn("kobject_create_and_add papr failed\n");
> +		goto out_pgs;
> +	}
> +
> +	esi_kobj = kobject_create_and_add("energy_scale_info", papr_kobj);
> +	if (!esi_kobj) {
> +		pr_warn("kobject_create_and_add energy_scale_info failed\n");
> +		goto out_kobj;
> +	}
> +
> +	for (idx = 0; idx < num_attrs; idx++) {
> +		bool show_val_desc = true;
> +
> +		pgs[idx].pg.attrs = kcalloc(MAX_ATTRS + 1,
> +					    sizeof(*pgs[idx].pg.attrs),
> +					    GFP_KERNEL);
> +		if (!pgs[idx].pg.attrs) {
> +			for (i = idx - 1; i >= 0; i--)
> +				kfree(pgs[i].pg.attrs);

What about the pg.name from the previous iterations?

> +			goto out_ekobj;
> +		}
> +
> +		pgs[idx].pg.name = kasprintf(GFP_KERNEL, "%lld",
> +					     be64_to_cpu(esi_attrs[idx].id));
> +		if (pgs[idx].pg.name == NULL) {
> +			for (i = idx; i >= 0; i--)
> +				kfree(pgs[i].pg.attrs);

Here too.

You could just 'goto out_pgattrs' in both cases.

> +			goto out_ekobj;
> +		}
> +		/* Do not add the value description if it does not exist */
> +		if (strnlen(esi_attrs[idx].value_desc,
> +			    sizeof(esi_attrs[idx].value_desc)) == 0)
> +			show_val_desc = false;
> +
> +		if (add_attr_group(be64_to_cpu(esi_attrs[idx].id), &pgs[idx],
> +				   show_val_desc)) {
> +			pr_warn("Failed to create papr attribute group %s\n",
> +				pgs[idx].pg.name);
> +			goto out_pgattrs;
> +		}
> +	}
> +
> +	kfree(esi_buf);
> +	return 0;
> +
> +out_pgattrs:
> +	for (i = 0; i < num_attrs ; i++) {
> +		kfree(pgs[i].pg.attrs);
> +		kfree(pgs[i].pg.name);
> +	}
> +out_ekobj:
> +	kobject_put(esi_kobj);
> +out_kobj:
> +	kobject_put(papr_kobj);
> +out_pgs:
> +	kfree(pgs);
> +out:
> +	kfree(esi_buf);
> +
> +	return -ENOMEM;
> +}
> +
> +machine_device_initcall(pseries, papr_init);