linux-kernel - Re: [PATCH] net-sysfs: Fix memory leak in netdev_register

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Date:   Mon, 18 Mar 2019 11:02:24 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Wang Hai <wanghai26@...wei.com>, davem@...emloft.net,
        idosch@...lanox.com, alexander.h.duyck@...el.com,
        tyhicks@...onical.com, f.fainelli@...il.com
Cc:     amritha.nambiar@...el.com, joe@...ches.com,
        dmitry.torokhov@...il.com, andriy.shevchenko@...ux.intel.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net-sysfs: Fix memory leak in netdev_register_kobject



On 03/18/2019 10:06 PM, Wang Hai wrote:
> When registering struct net_device, it will call
> 	register_netdevice ->
> 		netdev_register_kobject ->
> 			device_add(dev)
> 			register_queue_kobjects(ndev)
> 
> If device_add(dev) or register_queue_kobjects(ndev) fails.
> Register_netdevice() will return error, causing netdev_freemem(ndev)
> to be called to free net_device, however (&ndev->dev)->kobj.name will
> not be freed, resulting in a memory leak.
> 
> syzkaller report this:
> BUG: memory leak
> unreferenced object 0xffff8881f4fad168 (size 8):
> comm "syz-executor.0", pid 3575, jiffies 4294778002 (age 20.134s)
> hex dump (first 8 bytes):
>   77 70 61 6e 30 00 ff ff                          wpan0...
> backtrace:
>   [<000000006d2d91d7>] kstrdup_const+0x3d/0x50 mm/util.c:73
>   [<00000000ba9ff953>] kvasprintf_const+0x112/0x170 lib/kasprintf.c:48
>   [<000000005555ec09>] kobject_set_name_vargs+0x55/0x130 lib/kobject.c:281
>   [<0000000098d28ec3>] dev_set_name+0xbb/0xf0 drivers/base/core.c:1915
>   [<00000000b7553017>] netdev_register_kobject+0xc0/0x410 net/core/net-sysfs.c:1727
>   [<00000000c826a797>] register_netdevice+0xa51/0xeb0 net/core/dev.c:8711
>   [<00000000857bfcfd>] cfg802154_update_iface_num.isra.2+0x13/0x90 [ieee802154]
>   [<000000003126e453>] ieee802154_llsec_fill_key_id+0x1d5/0x570 [ieee802154]
>   [<00000000e4b3df51>] 0xffffffffc1500e0e
>   [<00000000b4319776>] platform_drv_probe+0xc6/0x180 drivers/base/platform.c:614
>   [<0000000037669347>] really_probe+0x491/0x7c0 drivers/base/dd.c:509
>   [<000000008fed8862>] driver_probe_device+0xdc/0x240 drivers/base/dd.c:671
>   [<00000000baf52041>] device_driver_attach+0xf2/0x130 drivers/base/dd.c:945
>   [<00000000c7cc8dec>] __driver_attach+0x10e/0x210 drivers/base/dd.c:1022
>   [<0000000057a757c2>] bus_for_each_dev+0x154/0x1e0 drivers/base/bus.c:304
>   [<000000005f5ae04b>] bus_add_driver+0x427/0x5e0 drivers/base/bus.c:645
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Fixes: 1d24eb4815d1 ("xps: Transmit Packet Steering")

The bug was there before this commit, right ?