Messages in this thread | | | Date | Tue, 11 Jun 2019 10:25:05 -0700 | Subject | KASAN: use-after-free Read in usb_kill_anchored_urbs | From | syzbot <> |
| |
Hello,
syzbot found the following crash on:
HEAD commit: 69bbe8c7 usb-fuzzer: main usb gadget fuzzer driver git tree: https://github.com/google/kasan.git usb-fuzzer console output: https://syzkaller.appspot.com/x/log.txt?x=15df4ecaa00000 kernel config: https://syzkaller.appspot.com/x/.config?x=193d8457178b3229 dashboard link: https://syzkaller.appspot.com/bug?extid=eb6ab607626fd1dac0f1 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11847e7aa00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14ef5f2ea00000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+eb6ab607626fd1dac0f1@syzkaller.appspotmail.com
mcba_usb 1-1:0.116 can0: Failed to send cmd (169) mcba_usb 1-1:0.116 can0: failed tx_urb -2 mcba_usb 1-1:0.116 can0: Failed to send cmd (169) mcba_usb 1-1:0.116: Microchip CAN BUS Analyzer connected usb 1-1: USB disconnect, device number 2 mcba_usb 1-1:0.116 can0: device disconnected ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3a5d/0x5340 kernel/locking/lockdep.c:3664 Read of size 8 at addr ffff8881d44c63c8 by task kworker/0:1/12
CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.2.0-rc1+ #10 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+0xca/0x13e lib/dump_stack.c:113 print_address_description+0x67/0x231 mm/kasan/report.c:188 __kasan_report.cold+0x1a/0x32 mm/kasan/report.c:317 kasan_report+0xe/0x20 mm/kasan/common.c:614 __lock_acquire+0x3a5d/0x5340 kernel/locking/lockdep.c:3664 lock_acquire+0x100/0x2b0 kernel/locking/lockdep.c:4302 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline] _raw_spin_lock_irq+0x2d/0x40 kernel/locking/spinlock.c:167 spin_lock_irq include/linux/spinlock.h:363 [inline] usb_kill_anchored_urbs+0x1e/0x110 drivers/usb/core/urb.c:787 mcba_urb_unlink drivers/net/can/usb/mcba_usb.c:722 [inline] mcba_usb_disconnect+0xd6/0xe4 drivers/net/can/usb/mcba_usb.c:892 usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423 __device_release_driver drivers/base/dd.c:1081 [inline] device_release_driver_internal+0x404/0x4c0 drivers/base/dd.c:1112 bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556 device_del+0x460/0xb80 drivers/base/core.c:2274 usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 usb_disconnect+0x284/0x830 drivers/usb/core/hub.c:2197 hub_port_connect drivers/usb/core/hub.c:4940 [inline] hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] port_event drivers/usb/core/hub.c:5350 [inline] hub_event+0x1409/0x3590 drivers/usb/core/hub.c:5432 process_one_work+0x905/0x1570 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x30b/0x410 kernel/kthread.c:254 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Allocated by task 12: save_stack+0x1b/0x80 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:462 kmalloc_node include/linux/slab.h:590 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:430 kvmalloc include/linux/mm.h:637 [inline] kvzalloc include/linux/mm.h:645 [inline] alloc_netdev_mqs+0x97/0xce0 net/core/dev.c:9154 alloc_candev_mqs+0x58/0x320 drivers/net/can/dev.c:738 mcba_usb_probe+0xaf/0xbca drivers/net/can/usb/mcba_usb.c:810 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361 really_probe+0x281/0x660 drivers/base/dd.c:509 driver_probe_device+0x104/0x210 drivers/base/dd.c:670 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777 bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454 __device_attach+0x217/0x360 drivers/base/dd.c:843 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 device_add+0xae6/0x16f0 drivers/base/core.c:2111 usb_set_configuration+0xdf6/0x1670 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+0x281/0x660 drivers/base/dd.c:509 driver_probe_device+0x104/0x210 drivers/base/dd.c:670 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:777 bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454 __device_attach+0x217/0x360 drivers/base/dd.c:843 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514 device_add+0xae6/0x16f0 drivers/base/core.c:2111 usb_new_device.cold+0x8c1/0x1016 drivers/usb/core/hub.c:2534 hub_port_connect drivers/usb/core/hub.c:5089 [inline] hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] port_event drivers/usb/core/hub.c:5350 [inline] hub_event+0x1ada/0x3590 drivers/usb/core/hub.c:5432 process_one_work+0x905/0x1570 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x30b/0x410 kernel/kthread.c:254 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Freed by task 12: save_stack+0x1b/0x80 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x130/0x180 mm/kasan/common.c:451 slab_free_hook mm/slub.c:1421 [inline] slab_free_freelist_hook mm/slub.c:1448 [inline] slab_free mm/slub.c:2994 [inline] kfree+0xd7/0x280 mm/slub.c:3949 kvfree+0x59/0x60 mm/util.c:459 device_release+0x71/0x200 drivers/base/core.c:1064 kobject_cleanup lib/kobject.c:691 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:67 [inline] kobject_put+0x171/0x280 lib/kobject.c:737 put_device+0x1b/0x30 drivers/base/core.c:2210 free_netdev+0x317/0x420 net/core/dev.c:9265 mcba_usb_disconnect+0xca/0xe4 drivers/net/can/usb/mcba_usb.c:890 usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423 __device_release_driver drivers/base/dd.c:1081 [inline] device_release_driver_internal+0x404/0x4c0 drivers/base/dd.c:1112 bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:556 device_del+0x460/0xb80 drivers/base/core.c:2274 usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 usb_disconnect+0x284/0x830 drivers/usb/core/hub.c:2197 hub_port_connect drivers/usb/core/hub.c:4940 [inline] hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] port_event drivers/usb/core/hub.c:5350 [inline] hub_event+0x1409/0x3590 drivers/usb/core/hub.c:5432 process_one_work+0x905/0x1570 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x30b/0x410 kernel/kthread.c:254 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
The buggy address belongs to the object at ffff8881d44c5500 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 3784 bytes inside of 4096-byte region [ffff8881d44c5500, ffff8881d44c6500) The buggy address belongs to the page: page:ffffea0007513000 refcount:1 mapcount:0 mapping:ffff8881dac02600 index:0x0 compound_mapcount: 0 flags: 0x200000000010200(slab|head) raw: 0200000000010200 dead000000000100 dead000000000200 ffff8881dac02600 raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected
Memory state around the buggy address: ffff8881d44c6280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d44c6300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8881d44c6380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881d44c6400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d44c6480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
--- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
| |