KASAN: use-after-free Read in asix

KASAN: use-after-free Read in asix_suspend
Status: upstream: reported C repro on 2019/12/22 01:45
Reported-by: syzbot+514595412b80dc817633@syzkaller.appspotmail.com
First crash: 160d, last: 6d01h

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2019/12/22 04:07	16m	tranmanphong@gmail.com	patch	https://github.com/google/kasan.git ecdf2214	OK

Sample crash report:

usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
hub 1-1:0.138: bad descriptor, ignoring hub
hub: probe of 1-1:0.138 failed with error -5
asix 1-1:0.138 (unnamed net_device) (uninitialized): Failed to read MAC address: 0
asix 1-1:0.138 eth1: register 'asix' at usb-dummy_hcd.0-1, ASIX AX88172A USB 2.0 Ethernet, 76:16:76:e7:25:cd
==================================================================
BUG: KASAN: use-after-free in asix_suspend+0xb9/0xc0 drivers/net/usb/asix_devices.c:617
Read of size 8 at addr ffff8881d1984288 by task kworker/0:1/12

CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.5.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xef/0x16e lib/dump_stack.c:118
 print_address_description.constprop.0+0x16/0x200 mm/kasan/report.c:374
 __kasan_report.cold+0x37/0x7f mm/kasan/report.c:506
 kasan_report+0xe/0x20 mm/kasan/common.c:639
 asix_suspend+0xb9/0xc0 drivers/net/usb/asix_devices.c:617
 usb_suspend_interface drivers/usb/core/driver.c:1203 [inline]
 usb_suspend_both+0x260/0x7b0 drivers/usb/core/driver.c:1308
 usb_runtime_suspend+0x46/0x120 drivers/usb/core/driver.c:1846
 __rpm_callback+0x27e/0x3c0 drivers/base/power/runtime.c:357
 rpm_callback+0x105/0x230 drivers/base/power/runtime.c:484
 rpm_suspend+0x37a/0x1300 drivers/base/power/runtime.c:629
 __pm_runtime_suspend+0xbb/0x150 drivers/base/power/runtime.c:1048
 pm_runtime_put_sync_autosuspend include/linux/pm_runtime.h:252 [inline]
 usb_new_device.cold+0xaee/0xe79 drivers/usb/core/hub.c:2567
 hub_port_connect drivers/usb/core/hub.c:5184 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
 port_event drivers/usb/core/hub.c:5470 [inline]
 hub_event+0x1e59/0x3860 drivers/usb/core/hub.c:5552
 process_one_work+0x92b/0x1530 kernel/workqueue.c:2264
 worker_thread+0x96/0xe20 kernel/workqueue.c:2410
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 12:
 save_stack+0x1b/0x80 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc mm/kasan/common.c:513 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:486
 kmalloc include/linux/slab.h:556 [inline]
 kzalloc include/linux/slab.h:670 [inline]
 ax88172a_bind+0x9f/0x7a2 drivers/net/usb/ax88172a.c:191
 usbnet_probe+0xb43/0x2470 drivers/net/usb/usbnet.c:1737
 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
 really_probe+0x281/0x6d0 drivers/base/dd.c:548
 driver_probe_device+0x104/0x210 drivers/base/dd.c:721
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
 __device_attach+0x217/0x360 drivers/base/dd.c:894
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
 device_add+0x1480/0x1c20 drivers/base/core.c:2487
 usb_set_configuration+0xe67/0x1740 drivers/usb/core/message.c:2023
 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
 usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
 really_probe+0x281/0x6d0 drivers/base/dd.c:548
 driver_probe_device+0x104/0x210 drivers/base/dd.c:721
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
 __device_attach+0x217/0x360 drivers/base/dd.c:894
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
 device_add+0x1480/0x1c20 drivers/base/core.c:2487
 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2537
 hub_port_connect drivers/usb/core/hub.c:5184 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
 port_event drivers/usb/core/hub.c:5470 [inline]
 hub_event+0x1e59/0x3860 drivers/usb/core/hub.c:5552
 process_one_work+0x92b/0x1530 kernel/workqueue.c:2264
 worker_thread+0x96/0xe20 kernel/workqueue.c:2410
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Freed by task 12:
 save_stack+0x1b/0x80 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:335 [inline]
 __kasan_slab_free+0x129/0x170 mm/kasan/common.c:474
 slab_free_hook mm/slub.c:1425 [inline]
 slab_free_freelist_hook mm/slub.c:1458 [inline]
 slab_free mm/slub.c:3005 [inline]
 kfree+0xda/0x310 mm/slub.c:3957
 ax88172a_bind.cold+0x4d/0x1e8 drivers/net/usb/ax88172a.c:250
 usbnet_probe+0xb43/0x2470 drivers/net/usb/usbnet.c:1737
 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
 really_probe+0x281/0x6d0 drivers/base/dd.c:548
 driver_probe_device+0x104/0x210 drivers/base/dd.c:721
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
 __device_attach+0x217/0x360 drivers/base/dd.c:894
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
 device_add+0x1480/0x1c20 drivers/base/core.c:2487
 usb_set_configuration+0xe67/0x1740 drivers/usb/core/message.c:2023
 generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
 usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
 really_probe+0x281/0x6d0 drivers/base/dd.c:548
 driver_probe_device+0x104/0x210 drivers/base/dd.c:721
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
 __device_attach+0x217/0x360 drivers/base/dd.c:894
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
 device_add+0x1480/0x1c20 drivers/base/core.c:2487
 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2537
 hub_port_connect drivers/usb/core/hub.c:5184 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
 port_event drivers/usb/core/hub.c:5470 [inline]
 hub_event+0x1e59/0x3860 drivers/usb/core/hub.c:5552
 process_one_work+0x92b/0x1530 kernel/workqueue.c:2264
 worker_thread+0x96/0xe20 kernel/workqueue.c:2410
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff8881d1984280
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 8 bytes inside of
 64-byte region [ffff8881d1984280, ffff8881d19842c0)
The buggy address belongs to the page:
page:ffffea0007466100 refcount:1 mapcount:0 mapping:ffff8881da003180 index:0x0
raw: 0200000000000200 ffffea00074c2100 0000000a0000000a ffff8881da003180
raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881d1984180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8881d1984200: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
>ffff8881d1984280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                      ^
 ffff8881d1984300: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8881d

Crashes (2):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci2-upstream-usb	2019/12/21 02:30	https://github.com/google/kasan.git usb-fuzzer	ecdf2214	bc586918	.config	log	report	syz	C	allison@lohutok.net, davem@davemloft.net, kstewart@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org, swinslow@gmail.com, tglx@linutronix.de, tranmanphong@gmail.com, zhang.run@zte.com.cn
ci2-upstream-usb	2020/05/23 03:00	https://github.com/google/kasan.git usb-fuzzer	806d8acc	4afdfa20	.config	log	report			davem@davemloft.net, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org, tranmanphong@gmail.com