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KASAN: use-after-free Read in hiddev_release

Status: fixed on 2019/08/27 17:15
Reported-by: syzbot+62a1e04fd3ec2abf099e@syzkaller.appspotmail.com
Fix commit: 9c09b214f30e HID: hiddev: avoid opening a disconnected device 6d4472d7bec3 HID: hiddev: do cleanup in failure of opening a device
First crash: 1066d, last: 1051d

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x302a/0x3b50 kernel/locking/lockdep.c:3753
Read of size 8 at addr ffff8881d128cd88 by task syz-executor792/1787

CPU: 1 PID: 1787 Comm: syz-executor792 Not tainted 5.3.0-rc2+ #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xca/0x13e lib/dump_stack.c:113
 print_address_description+0x6a/0x32c mm/kasan/report.c:351
 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
 kasan_report+0xe/0x12 mm/kasan/common.c:612
 __lock_acquire+0x302a/0x3b50 kernel/locking/lockdep.c:3753
 lock_acquire+0x127/0x320 kernel/locking/lockdep.c:4412
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x32/0x50 kernel/locking/spinlock.c:159
 hiddev_release+0x82/0x520 drivers/hid/usbhid/hiddev.c:221
 __fput+0x2d7/0x840 fs/file_table.c:280
 task_work_run+0x13f/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x8ef/0x2c50 kernel/exit.c:878
 do_group_exit+0x125/0x340 kernel/exit.c:982
 __do_sys_exit_group kernel/exit.c:993 [inline]
 __se_sys_exit_group kernel/exit.c:991 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:991
 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445ad8
Code: Bad RIP value.
RSP: 002b:00007ffd68b3af38 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445ad8
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00000000004c5e50 R08: 00000000000000e7 R09: ffffffffffffffd4
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000006d8180 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 1742:
 save_stack+0x1b/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc mm/kasan/common.c:487 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460
 kmalloc include/linux/slab.h:552 [inline]
 kzalloc include/linux/slab.h:748 [inline]
 hiddev_connect+0x242/0x5b0 drivers/hid/usbhid/hiddev.c:900
 hid_connect+0x239/0xbb0 drivers/hid/hid-core.c:1882
 hid_hw_start drivers/hid/hid-core.c:1981 [inline]
 hid_hw_start+0xa2/0x130 drivers/hid/hid-core.c:1972
 appleir_probe+0x13e/0x1a0 drivers/hid/hid-appleir.c:308
 hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2209
 really_probe+0x281/0x650 drivers/base/dd.c:548
 driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
 bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
 __device_attach+0x217/0x360 drivers/base/dd.c:882
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
 device_add+0xae6/0x16f0 drivers/base/core.c:2114
 hid_add_device+0x33c/0x990 drivers/hid/hid-core.c:2365
 usbhid_probe+0xa81/0xfa0 drivers/hid/usbhid/hid-core.c:1386
 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
 really_probe+0x281/0x650 drivers/base/dd.c:548
 driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
 bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
 __device_attach+0x217/0x360 drivers/base/dd.c:882
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
 device_add+0xae6/0x16f0 drivers/base/core.c:2114
 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+0x281/0x650 drivers/base/dd.c:548
 driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
 bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
 __device_attach+0x217/0x360 drivers/base/dd.c:882
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
 device_add+0xae6/0x16f0 drivers/base/core.c:2114
 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
 hub_port_connect drivers/usb/core/hub.c:5098 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
 port_event drivers/usb/core/hub.c:5359 [inline]
 hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441
 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
 process_scheduled_works kernel/workqueue.c:2331 [inline]
 worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Freed by task 1742:
 save_stack+0x1b/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449
 slab_free_hook mm/slub.c:1423 [inline]
 slab_free_freelist_hook mm/slub.c:1470 [inline]
 slab_free mm/slub.c:3012 [inline]
 kfree+0xe4/0x2f0 mm/slub.c:3953
 hiddev_connect.cold+0x45/0x5c drivers/hid/usbhid/hiddev.c:914
 hid_connect+0x239/0xbb0 drivers/hid/hid-core.c:1882
 hid_hw_start drivers/hid/hid-core.c:1981 [inline]
 hid_hw_start+0xa2/0x130 drivers/hid/hid-core.c:1972
 appleir_probe+0x13e/0x1a0 drivers/hid/hid-appleir.c:308
 hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2209
 really_probe+0x281/0x650 drivers/base/dd.c:548
 driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
 bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
 __device_attach+0x217/0x360 drivers/base/dd.c:882
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
 device_add+0xae6/0x16f0 drivers/base/core.c:2114
 hid_add_device+0x33c/0x990 drivers/hid/hid-core.c:2365
 usbhid_probe+0xa81/0xfa0 drivers/hid/usbhid/hid-core.c:1386
 usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
 really_probe+0x281/0x650 drivers/base/dd.c:548
 driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
 bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
 __device_attach+0x217/0x360 drivers/base/dd.c:882
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
 device_add+0xae6/0x16f0 drivers/base/core.c:2114
 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+0x281/0x650 drivers/base/dd.c:548
 driver_probe_device+0x101/0x1b0 drivers/base/dd.c:709
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:816
 bus_for_each_drv+0x15c/0x1e0 drivers/base/bus.c:454
 __device_attach+0x217/0x360 drivers/base/dd.c:882
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:514
 device_add+0xae6/0x16f0 drivers/base/core.c:2114
 usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2536
 hub_port_connect drivers/usb/core/hub.c:5098 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
 port_event drivers/usb/core/hub.c:5359 [inline]
 hub_event+0x1b5c/0x3640 drivers/usb/core/hub.c:5441
 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
 process_scheduled_works kernel/workqueue.c:2331 [inline]
 worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
 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 ffff8881d128cc80
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 264 bytes inside of
 512-byte region [ffff8881d128cc80, ffff8881d128ce80)
The buggy address belongs to the page:
page:ffffea000744a300 refcount:1 mapcount:0 mapping:ffff8881da002500 index:0x0 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 0000000000000000 0000000b00000001 ffff8881da002500
raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881d128cc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881d128cd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881d128cd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff8881d128ce00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881d128ce80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (11):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-usb 2019/08/11 11:49 https://github.com/google/kasan.git usb-fuzzer e96407b49762 acb51638 .config log report syz C
ci2-upstream-usb 2019/08/04 19:21 https://github.com/google/kasan.git usb-fuzzer e96407b49762 6affd8e8 .config log report syz C
ci2-upstream-usb 2019/08/09 05:53 https://github.com/google/kasan.git usb-fuzzer e96407b49762 ede31a9b .config log report syz
ci2-upstream-usb 2019/08/06 21:57 https://github.com/google/kasan.git usb-fuzzer e96407b49762 da562c0b .config log report syz
ci2-upstream-usb 2019/08/16 23:57 https://github.com/google/kasan.git usb-fuzzer d0847550e22d 8fd428a1 .config log report
ci2-upstream-usb 2019/08/16 02:45 https://github.com/google/kasan.git usb-fuzzer d0847550e22d faeffb00 .config log report
ci2-upstream-usb 2019/08/14 09:59 https://github.com/google/kasan.git usb-fuzzer d0847550e22d ef801a3e .config log report
ci2-upstream-usb 2019/08/12 13:51 https://github.com/google/kasan.git usb-fuzzer d0847550e22d 8620c2c2 .config log report
ci2-upstream-usb 2019/08/09 13:52 https://github.com/google/kasan.git usb-fuzzer e96407b49762 aff9e255 .config log report
ci2-upstream-usb 2019/08/04 08:39 https://github.com/google/kasan.git usb-fuzzer e96407b49762 6affd8e8 .config log report
ci2-upstream-usb 2019/08/01 14:05 https://github.com/google/kasan.git usb-fuzzer e96407b49762 835dffe7 .config log report