syzbot


KASAN: use-after-free Read in v4l2_release
Status: fixed on 2019/08/05 13:45
Reported-by: syzbot+a4387f5b6b799f6becbf@syzkaller.appspotmail.com
Fix commit: c666355e60dd media: radio-raremono: change devm_k*alloc to k*alloc
First crash: 1135d, last: 1031d
duplicates (1):
Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
KASAN: use-after-free Read in v4l2_ioctl C 33 1055d 1136d 22/22 closed as dup on 2019/08/13 14:06
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: use-after-free Read in v4l2_release (2) 9 896d 974d 0/22 closed as dup on 2019/09/23 15:12
upstream KASAN: use-after-free Read in v4l2_release (3) C error error 34 311d 867d 0/22 upstream: reported C repro on 2020/01/08 20:24
Patch testing requests:
Created Duration User Patch Repo Result
2019/06/18 06:39 36m lnowakow@eng.ucsd.edu patch https://github.com/google/kasan.git usb-fuzzer OK
2019/06/18 06:34 0m lnowakow@eng.ucsd.edu patch https://github.com/google/kasan.git usb-fuzzer error

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in v4l2_release+0x319/0x390 drivers/media/v4l2-core/v4l2-dev.c:449
Read of size 8 at addr ffff8881c80267e0 by task v4l_id/3136

CPU: 0 PID: 3136 Comm: v4l_id Not tainted 5.2.0-rc6+ #14
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+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
 v4l2_release+0x319/0x390 drivers/media/v4l2-core/v4l2-dev.c:449
 __fput+0x2d7/0x790 fs/file_table.c:280
 task_work_run+0x13f/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:185 [inline]
 exit_to_usermode_loop+0x1c5/0x1f0 arch/x86/entry/common.c:168
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:279 [inline]
 do_syscall_64+0x43f/0x560 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fd2922da2b0
Code: 40 75 0b 31 c0 48 83 c4 08 e9 0c ff ff ff 48 8d 3d c5 32 08 00 e8 c0 07 02 00 83 3d 45 a3 2b 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ce 8a 01 00 48 89 04 24
RSP: 002b:00007fff15a044d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007fd2922da2b0
RDX: 00007fd292590df0 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007fd292590df0 R09: 000000000000000a
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000400884
R13: 00007fff15a04630 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 1741:
 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
 slab_post_alloc_hook mm/slab.h:437 [inline]
 slab_alloc_node mm/slub.c:2748 [inline]
 __kmalloc_node_track_caller+0xee/0x370 mm/slub.c:4363
 alloc_dr drivers/base/devres.c:103 [inline]
 devm_kmalloc+0x87/0x190 drivers/base/devres.c:815
 devm_kzalloc include/linux/device.h:679 [inline]
 usb_raremono_probe+0x2f/0x231 drivers/media/radio/radio-raremono.c:298
 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: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+0x1b3d/0x35f0 drivers/usb/core/hub.c:5441
 process_one_work+0x905/0x1570 kernel/workqueue.c:2269
 process_scheduled_works kernel/workqueue.c:2331 [inline]
 worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
 kthread+0x30b/0x410 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Freed by task 1741:
 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
 release_nodes+0x4a1/0x910 drivers/base/devres.c:508
 devres_release_all+0x74/0xc3 drivers/base/devres.c:529
 __device_release_driver drivers/base/dd.c:1085 [inline]
 device_release_driver_internal+0x21b/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:2199
 hub_port_connect drivers/usb/core/hub.c:4949 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5213 [inline]
 port_event drivers/usb/core/hub.c:5359 [inline]
 hub_event+0x143d/0x35f0 drivers/usb/core/hub.c:5441
 process_one_work+0x905/0x1570 kernel/workqueue.c:2269
 process_scheduled_works kernel/workqueue.c:2331 [inline]
 worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
 kthread+0x30b/0x410 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff8881c8026600
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 480 bytes inside of
 4096-byte region [ffff8881c8026600, ffff8881c8027600)
The buggy address belongs to the page:
page:ffffea0007200800 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:
 ffff8881c8026680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881c8026700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881c8026780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff8881c8026800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881c8026880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (275):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-usb 2019/07/12 07:54 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 baa5258a .config log report syz C
ci2-upstream-usb 2019/06/12 03:22 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f ea2f4006 .config log report syz C
ci2-upstream-usb 2019/06/11 15:01 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 5b5826d0 .config log report syz C
ci2-upstream-usb 2019/06/11 05:01 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 0159583c .config log report syz C
ci2-upstream-usb 2019/06/09 02:36 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 0159583c .config log report syz C
ci2-upstream-usb 2019/06/08 13:49 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 0159583c .config log report syz C
ci2-upstream-usb 2019/06/06 09:39 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f a547defc .config log report syz C
ci2-upstream-usb 2019/06/04 01:37 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f ce07a7ae .config log report syz C
ci2-upstream-usb 2019/06/02 05:26 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 53c81ea5 .config log report syz C
ci2-upstream-usb 2019/05/09 22:42 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 214bf476 .config log report syz C
ci2-upstream-usb 2019/05/08 05:25 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce a7383bfa .config log report syz C
ci2-upstream-usb 2019/04/28 23:41 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce b617407b .config log report syz C
ci2-upstream-usb 2019/04/27 15:20 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce b617407b .config log report syz C
ci2-upstream-usb 2019/04/26 01:13 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce f46aabc8 .config log report syz C
ci2-upstream-usb 2019/04/23 23:02 https://github.com/google/kasan.git usb-fuzzer d34f9519daaa 2398edea .config log report syz C
ci2-upstream-usb 2019/04/21 17:10 https://github.com/google/kasan.git usb-fuzzer d34f9519daaa b0e8efcb .config log report syz C
ci2-upstream-usb 2019/04/21 08:37 https://github.com/google/kasan.git usb-fuzzer d34f9519daaa b0e8efcb .config log report syz C
ci2-upstream-usb 2019/04/20 21:32 https://github.com/google/kasan.git usb-fuzzer d34f9519daaa b0e8efcb .config log report syz C
ci2-upstream-usb 2019/04/17 11:52 https://github.com/google/kasan.git usb-fuzzer 9a33b36996cb b0e8efcb .config log report syz C
ci2-upstream-usb 2019/04/16 03:39 https://github.com/google/kasan.git usb-fuzzer 9a33b36996cb 505ab413 .config log report syz C
ci2-upstream-usb 2019/06/17 04:01 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 442206d7 .config log report syz
ci2-upstream-usb 2019/06/10 08:18 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 0159583c .config log report syz
ci2-upstream-usb 2019/06/08 11:56 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 0159583c .config log report syz
ci2-upstream-usb 2019/05/19 13:48 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 5a4461b0 .config log report syz
ci2-upstream-usb 2019/05/13 00:20 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 5f302c04 .config log report syz
ci2-upstream-usb 2019/05/12 23:40 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 5f302c04 .config log report syz
ci2-upstream-usb 2019/05/12 20:31 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 5f302c04 .config log report syz
ci2-upstream-usb 2019/05/09 04:39 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 1ab4c999 .config log report syz
ci2-upstream-usb 2019/05/04 06:07 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce d28f4ce5 .config log report syz
ci2-upstream-usb 2019/05/01 20:22 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 7516d9fa .config log report syz
ci2-upstream-usb 2019/04/24 13:12 https://github.com/google/kasan.git usb-fuzzer d34f9519daaa 8e3c52b1 .config log report syz
ci2-upstream-usb 2019/04/19 12:49 https://github.com/google/kasan.git usb-fuzzer d34f9519daaa b0e8efcb .config log report syz
ci2-upstream-usb 2019/04/17 03:19 https://github.com/google/kasan.git usb-fuzzer 9a33b36996cb b0e8efcb .config log report syz
ci2-upstream-usb 2019/07/28 11:01 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 c85e1c5b .config log report
ci2-upstream-usb 2019/07/27 19:51 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 c85e1c5b .config log report
ci2-upstream-usb 2019/07/24 15:14 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 32329ceb .config log report
ci2-upstream-usb 2019/07/22 21:01 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 55e0c077 .config log report
ci2-upstream-usb 2019/07/18 11:30 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 7bb222f7 .config log report
ci2-upstream-usb 2019/07/18 08:58 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 7bb222f7 .config log report
ci2-upstream-usb 2019/07/15 18:34 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 139ac68a .config log report
ci2-upstream-usb 2019/07/15 12:41 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 a827bf70 .config log report
ci2-upstream-usb 2019/07/15 04:17 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 a827bf70 .config log report
ci2-upstream-usb 2019/07/14 13:47 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 e6fb0f13 .config log report
ci2-upstream-usb 2019/07/14 03:58 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 e6fb0f13 .config log report
ci2-upstream-usb 2019/07/12 02:18 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 baa5258a .config log report
ci2-upstream-usb 2019/07/11 15:33 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 186a30b9 .config log report
ci2-upstream-usb 2019/07/08 12:59 https://github.com/google/kasan.git usb-fuzzer 7829a896a587 f62e1e85 .config log report
ci2-upstream-usb 2019/07/01 02:50 https://github.com/google/kasan.git usb-fuzzer 7829a896a587 699d6448 .config log report
ci2-upstream-usb 2019/06/30 15:41 https://github.com/google/kasan.git usb-fuzzer 7829a896a587 7509bf36 .config log report
ci2-upstream-usb 2019/06/25 08:46 https://github.com/google/kasan.git usb-fuzzer 9939f56ee6c0 82c13b6b .config log report
ci2-upstream-usb 2019/06/24 13:12 https://github.com/google/kasan.git usb-fuzzer 9939f56ee6c0 2873954b .config log report
ci2-upstream-usb 2019/06/24 05:32 https://github.com/google/kasan.git usb-fuzzer 9939f56ee6c0 472f0082 .config log report
ci2-upstream-usb 2019/06/22 21:06 https://github.com/google/kasan.git usb-fuzzer 9939f56ee6c0 34bf9440 .config log report
ci2-upstream-usb 2019/06/22 18:02 https://github.com/google/kasan.git usb-fuzzer 9939f56ee6c0 34bf9440 .config log report
ci2-upstream-usb 2019/06/22 15:16 https://github.com/google/kasan.git usb-fuzzer 9939f56ee6c0 34bf9440 .config log report
ci2-upstream-usb 2019/06/22 06:56 https://github.com/google/kasan.git usb-fuzzer 9939f56ee6c0 34bf9440 .config log report
ci2-upstream-usb 2019/06/21 12:50 https://github.com/google/kasan.git usb-fuzzer 9939f56ee6c0 34bf9440 .config log report
ci2-upstream-usb 2019/06/20 14:34 https://github.com/google/kasan.git usb-fuzzer 9939f56ee6c0 34bf9440 .config log report
ci2-upstream-usb 2019/06/19 20:55 https://github.com/google/kasan.git usb-fuzzer 9939f56ee6c0 34bf9440 .config log report
ci2-upstream-usb 2019/06/19 18:09 https://github.com/google/kasan.git usb-fuzzer 9939f56ee6c0 34bf9440 .config log report
ci2-upstream-usb 2019/06/18 04:29 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 442206d7 .config log report
ci2-upstream-usb 2019/06/17 08:11 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 442206d7 .config log report
ci2-upstream-usb 2019/06/17 00:24 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 442206d7 .config log report
ci2-upstream-usb 2019/06/16 18:48 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 442206d7 .config log report
ci2-upstream-usb 2019/06/14 05:34 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 998ccc76 .config log report
ci2-upstream-usb 2019/06/13 22:36 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f d25bb7ad .config log report
ci2-upstream-usb 2019/06/06 14:49 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f f5dd5568 .config log report
ci2-upstream-usb 2019/06/06 10:43 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f a547defc .config log report
ci2-upstream-usb 2019/06/05 23:55 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f bfb4a51e .config log report
ci2-upstream-usb 2019/06/05 21:23 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f bfb4a51e .config log report
ci2-upstream-usb 2019/06/05 18:09 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f bfb4a51e .config log report
ci2-upstream-usb 2019/06/05 09:20 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f bfb4a51e .config log report
ci2-upstream-usb 2019/06/05 05:58 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f bfb4a51e .config log report
ci2-upstream-usb 2019/06/04 18:03 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f e41a20c5 .config log report
ci2-upstream-usb 2019/06/03 21:16 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 63bf051f .config log report
ci2-upstream-usb 2019/06/03 08:27 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 53c81ea5 .config log report
ci2-upstream-usb 2019/06/03 03:09 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 53c81ea5 .config log report
ci2-upstream-usb 2019/06/01 21:12 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 53c81ea5 .config log report
ci2-upstream-usb 2019/04/15 12:25 https://github.com/google/kasan.git usb-fuzzer 9a33b36996cb 505ab413 .config log report