linux-kernel - Re: [PATCH 4/5] kernel handling of memory DLPAR

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Message-ID: <20090914063911.GB13139@centrinvest.ru>
Date:	Mon, 14 Sep 2009 10:39:11 +0400
From:	"Andrey Panin" <pazke@...trinvest.ru>
To:	Nathan Fontenot <nfont@...tin.ibm.com>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] kernel handling of memory DLPAR

On 254, 09 11, 2009 at 04:14:35PM -0500, Nathan Fontenot wrote:
> This adds the capability to DLPAR add and remove memory from the kernel.  The
> patch extends the powerpc handling of memory_add_physaddr_to_nid(), which is
> called from the sysfs memory 'probe' file to first ensure that the memory
> has been added to the system.  This is done by creating a platform specific
> callout from the routine.  The pseries implementation of this handles the
> DLPAR work to add the memory to the system and update the device tree.
> 
> The patch also creates a pseries only 'release' sys file,
> /sys/devices/system/memory/release.  This file handles the DLPAR
> release of
> memory back to firmware and updating of the device-tree.
> 
> Signed-off-by: Nathan Fontenot <nfont@...tin.ibm.com>

> +static struct property *clone_property(struct property *old_prop)
> +{
> +	struct property *new_prop;
> +
> +	new_prop = kzalloc((sizeof *new_prop), GFP_KERNEL);
> +	if (!new_prop)
> +		return NULL;
> +
> +	new_prop->name = kzalloc(strlen(old_prop->name) + 1, GFP_KERNEL);
> +	new_prop->value = kzalloc(old_prop->length + 1, GFP_KERNEL);

Memory leak here. What if one kzalloc() succeeded and another failed ?

> +	if (!new_prop->name || !new_prop->value) {
> +		free_property(new_prop);
> +		return NULL;
> +	}
> +
> +	strcpy(new_prop->name, old_prop->name);
> +	memcpy(new_prop->value, old_prop->value, old_prop->length);
> +	new_prop->length = old_prop->length;
> +
> +	return new_prop;
> +}
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