linux-kernel - Re: [RFC PATCH] use dev_set_name(,NULL) to prevent leaking

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Message-ID: <49F72205.7030306@kernel.org>
Date:	Tue, 28 Apr 2009 08:34:29 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Kay Sievers <kay.sievers@...y.org>
CC:	Ingo Molnar <mingo@...e.hu>, Greg KH <gregkh@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-pci@...r.kernel.org
Subject: Re: [RFC PATCH] use dev_set_name(,NULL) to prevent leaking

Yinghai Lu wrote:
> Kay Sievers wrote:
>> On Tue, Apr 28, 2009 at 09:42, Yinghai Lu <yinghai@...nel.org> wrote:
>>> those about 1/3 dev_set_name() etc.
>> put_device()?
>>
>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=drivers/base/core.c;h=4aa527b8a91381289eb175b33f46e3e418d10374;hb=HEAD#l848
>>
> ok, normal release path seems right, put_device will free the name.
> 
> how about other fail path, that there is not put_device involved?
> 
 
looks like need to follow this pattern

static int
sa1111_init_one_child(struct sa1111 *sachip, struct resource *parent,
                      struct sa1111_dev_info *info)
{
        struct sa1111_dev *dev;
        int ret;

        dev = kzalloc(sizeof(struct sa1111_dev), GFP_KERNEL);
        if (!dev) {
                ret = -ENOMEM;
                goto out;
        }

        dev_set_name(&dev->dev, "%4.4lx", info->offset);
        dev->devid       = info->devid;
        dev->dev.parent  = sachip->dev;
        dev->dev.bus     = &sa1111_bus_type;
        dev->dev.release = sa1111_dev_release;
        dev->dev.coherent_dma_mask = sachip->dev->coherent_dma_mask;
        dev->res.start   = sachip->phys + info->offset;
        dev->res.end     = dev->res.start + 511;
        dev->res.name    = dev_name(&dev->dev);
        dev->res.flags   = IORESOURCE_MEM;
        dev->mapbase     = sachip->base + info->offset;
        dev->skpcr_mask  = info->skpcr_mask;
        memmove(dev->irq, info->irq, sizeof(dev->irq));

        ret = request_resource(parent, &dev->res);
        if (ret) {
                printk("SA1111: failed to allocate resource for %s\n",
                        dev->res.name);
                dev_set_name(&dev->dev, NULL); ============> clear the name
                kfree(dev);
                goto out;
        }
        

        ret = device_register(&dev->dev);
        if (ret) {
                release_resource(&dev->res);
                put_device(&dev->dev);   ==================> put the device...
                kfree(dev);
                goto out;
        }


YH

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