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authorWang Hai <wanghai26@huawei.com>2019-03-20 14:25:05 -0400
committerDavid S. Miller <davem@davemloft.net>2019-03-21 13:38:27 -0700
commit6b70fc94afd165342876e53fc4b2f7d085009945 (patch)
tree6598fe25c66a68e590256bc67460efcd3eb8db12 /net
parent1ea186e3aeead3d99f82fbda820d758d59947b41 (diff)
net-sysfs: Fix memory leak in netdev_register_kobject
When registering struct net_device, it will call register_netdevice -> netdev_register_kobject -> device_initialize(dev); dev_set_name(dev, "%s", ndev->name) device_add(dev) register_queue_kobjects(ndev) In netdev_register_kobject(), if device_add(dev) or register_queue_kobjects(ndev) failed. Register_netdevice() will return error, causing netdev_freemem(ndev) to be called to free net_device, however put_device(&dev->dev)->..-> kobject_cleanup() won't be called, 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@huawei.com> Fixes: 1fa5ae857bb1 ("driver core: get rid of struct device's bus_id string array") Signed-off-by: Wang Hai <wanghai26@huawei.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/net-sysfs.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 8f8b7b6c2945..f8f94303a1f5 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -1747,16 +1747,20 @@ int netdev_register_kobject(struct net_device *ndev)
error = device_add(dev);
if (error)
- return error;
+ goto error_put_device;
error = register_queue_kobjects(ndev);
- if (error) {
- device_del(dev);
- return error;
- }
+ if (error)
+ goto error_device_del;
pm_runtime_set_memalloc_noio(dev, true);
+ return 0;
+
+error_device_del:
+ device_del(dev);
+error_put_device:
+ put_device(dev);
return error;
}