general protection fault in cdev

general protection fault in cdev_del
Status: upstream: reported C repro on 2019/05/28 10:48
Reported-by: syzbot+67b2bd0e34f952d0321e@syzkaller.appspotmail.com
First crash: 173d, last: 14h44m

duplicates (1):
Title	Repro	Bisected	Count	Last	Reported	Patched	Status
KASAN: use-after-free Read in device_del			2	61d	166d	0/14	closed as dup on 2019/08/19 18:37

Sample crash report:

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN PTI
CPU: 1 PID: 2486 Comm: kworker/1:2 Not tainted 5.2.0-rc1+ #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:cdev_del+0x22/0x90 fs/char_dev.c:592
Code: cf 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 ec 08 e8 93 a5 d5 ff 48 8d 7d 64 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 4f 48
RSP: 0018:ffff8881d18e7218 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff8881d249a100 RCX: ffffffff820d879e
RDX: 000000000000000c RSI: ffffffff8167705d RDI: 0000000000000064
RBP: 0000000000000000 R08: ffff8881d18d1800 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8881d25c9100 R14: 0000000000000000 R15: ffff8881cc2a8070
FS:  0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f35af318000 CR3: 00000001cc182000 CR4: 00000000001406e0
Call Trace:
 tty_unregister_device drivers/tty/tty_io.c:3192 [inline]
 tty_unregister_device+0x10d/0x1a0 drivers/tty/tty_io.c:3187
 hso_serial_tty_unregister drivers/net/usb/hso.c:2245 [inline]
 hso_create_bulk_serial_device drivers/net/usb/hso.c:2682 [inline]
 hso_probe.cold+0xc8/0x120 drivers/net/usb/hso.c:2948
 usb_probe_interface+0x30b/0x7a0 drivers/usb/core/driver.c:361
 really_probe+0x287/0x660 drivers/base/dd.c:509
 driver_probe_device+0x104/0x210 drivers/base/dd.c:670
 __device_attach_driver+0x1c4/0x230 drivers/base/dd.c:777
 bus_for_each_drv+0x15e/0x1e0 drivers/base/bus.c:454
 __device_attach+0x217/0x360 drivers/base/dd.c:843
 bus_probe_device+0x1e6/0x290 drivers/base/bus.c:514
 device_add+0xae6/0x1700 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+0xa2/0x100 drivers/usb/core/driver.c:266
 really_probe+0x287/0x660 drivers/base/dd.c:509
 driver_probe_device+0x104/0x210 drivers/base/dd.c:670
 __device_attach_driver+0x1c4/0x230 drivers/base/dd.c:777
 bus_for_each_drv+0x15e/0x1e0 drivers/base/bus.c:454
 __device_attach+0x217/0x360 drivers/base/dd.c:843
 bus_probe_device+0x1e6/0x290 drivers/base/bus.c:514
 device_add+0xae6/0x1700 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+0x1adc/0x35a0 drivers/usb/core/hub.c:5432
 process_one_work+0x90a/0x1580 kernel/workqueue.c:2268
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 kthread+0x30e/0x420 kernel/kthread.c:254
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 3b56fa5a205cba42 ]---
RIP: 0010:cdev_del+0x22/0x90 fs/char_dev.c:592
Code: cf 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 ec 08 e8 93 a5 d5 ff 48 8d 7d 64 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 4f 48
RSP: 0018:ffff8881d18e7218 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff8881d249a100 RCX: ffffffff820d879e
RDX: 000000000000000c RSI: ffffffff8167705d RDI: 0000000000000064
RBP: 0000000000000000 R08: ffff8881d18d1800 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8881d25c9100 R14: 0000000000000000 R15: ffff8881cc2a8070
FS:  0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f35af318000 CR3: 00000001cc182000 CR4: 00000000001406e0

Crashes (62):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci2-upstream-usb	2019/05/28 02:54	https://github.com/google/kasan.git usb-fuzzer	69bbe8c7	6bd61501	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/11/16 19:17	https://github.com/google/kasan.git usb-fuzzer	46178223	cdac920b	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/11/11 09:03	https://github.com/google/kasan.git usb-fuzzer	3183c037	dc438b91	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/11/07 13:05	https://github.com/google/kasan.git usb-fuzzer	d60bbfea	d797d201	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/11/05 21:41	https://github.com/google/kasan.git usb-fuzzer	b1aa9d83	af5c522d	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/11/05 21:11	https://github.com/google/kasan.git usb-fuzzer	b1aa9d83	af5c522d	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/26 05:37	https://github.com/google/kasan.git usb-fuzzer	22be26f7	413926c5	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/23 20:04	https://github.com/google/kasan.git usb-fuzzer	22be26f7	b602d64b	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/22 22:35	https://github.com/google/kasan.git usb-fuzzer	22be26f7	4ee855e7	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/15 08:56	https://github.com/google/kasan.git usb-fuzzer	22be26f7	05ad7292	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/06 02:46	https://github.com/google/kasan.git usb-fuzzer	58d5f26a	f3f7d9c8	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/05 03:02	https://github.com/google/kasan.git usb-fuzzer	58d5f26a	f3f7d9c8	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/03 15:58	https://github.com/google/kasan.git usb-fuzzer	58d5f26a	fc17ba49	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/02 19:42	https://github.com/google/kasan.git usb-fuzzer	58d5f26a	2e29b534	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/27 22:37	https://github.com/google/kasan.git usb-fuzzer	2994c077	d8074e0b	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/25 06:20	https://github.com/google/kasan.git usb-fuzzer	d9e63adc	e38a6630	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/22 02:57	https://github.com/google/kasan.git usb-fuzzer	e0bd8d79	d96e88f3	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/21 07:30	https://github.com/google/kasan.git usb-fuzzer	e0bd8d79	d96e88f3	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/12 01:24	https://github.com/google/kasan.git usb-fuzzer	f0df5c1b	f4e53c10	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/08/31 23:07	https://github.com/google/kasan.git usb-fuzzer	eea39f24	bad3cce2	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/06/06 13:20	https://github.com/google/kasan.git usb-fuzzer	69bbe8c7	a547defc	.config	log	report	syz	C	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/06/02 09:48	https://github.com/google/kasan.git usb-fuzzer	69bbe8c7	53c81ea5	.config	log	report	syz		linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/11/11 16:27	https://github.com/google/kasan.git usb-fuzzer	3183c037	377d77fa	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/11/07 19:40	https://github.com/google/kasan.git usb-fuzzer	d60bbfea	f39aff9e	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/11/06 08:33	https://github.com/google/kasan.git usb-fuzzer	b1aa9d83	bc2c6e45	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/11/02 04:22	https://github.com/google/kasan.git usb-fuzzer	ff6409a6	997ccc67	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/31 15:48	https://github.com/google/kasan.git usb-fuzzer	ff6409a6	a41ca8fa	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/29 04:17	https://github.com/google/kasan.git usb-fuzzer	ff6409a6	5ea87a66	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/24 10:51	https://github.com/google/kasan.git usb-fuzzer	22be26f7	d01bb02a	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/21 15:52	https://github.com/google/kasan.git usb-fuzzer	22be26f7	b24d2b8a	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/16 14:05	https://github.com/google/kasan.git usb-fuzzer	22be26f7	d4ea592f	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/16 01:36	https://github.com/google/kasan.git usb-fuzzer	22be26f7	d4ea592f	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/16 00:14	https://github.com/google/kasan.git usb-fuzzer	22be26f7	d4ea592f	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/14 23:05	https://github.com/google/kasan.git usb-fuzzer	22be26f7	05ad7292	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/13 21:01	https://github.com/google/kasan.git usb-fuzzer	58d5f26a	2f661ec4	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/11 12:51	https://github.com/google/kasan.git usb-fuzzer	58d5f26a	1a3bad90	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/11 11:31	https://github.com/google/kasan.git usb-fuzzer	58d5f26a	1a3bad90	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/09 08:03	https://github.com/google/kasan.git usb-fuzzer	58d5f26a	312c6a5a	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/08 03:48	https://github.com/google/kasan.git usb-fuzzer	58d5f26a	28ac6e64	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/05 13:17	https://github.com/google/kasan.git usb-fuzzer	58d5f26a	f3f7d9c8	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/04 19:01	https://github.com/google/kasan.git usb-fuzzer	58d5f26a	c86336cf	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/04 07:44	https://github.com/google/kasan.git usb-fuzzer	58d5f26a	fc17ba49	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/10/03 14:20	https://github.com/google/kasan.git usb-fuzzer	58d5f26a	fc17ba49	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/30 06:27	https://github.com/google/kasan.git usb-fuzzer	2994c077	c1ad5441	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/30 05:08	https://github.com/google/kasan.git usb-fuzzer	2994c077	c1ad5441	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/29 08:50	https://github.com/google/kasan.git usb-fuzzer	2994c077	c1ad5441	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/21 03:13	https://github.com/google/kasan.git usb-fuzzer	e0bd8d79	d96e88f3	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/20 13:27	https://github.com/google/kasan.git usb-fuzzer	e0bd8d79	d96e88f3	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/18 16:11	https://github.com/google/kasan.git usb-fuzzer	f0df5c1b	46c0be24	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/17 13:32	https://github.com/google/kasan.git usb-fuzzer	f0df5c1b	13dcda9b	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/17 12:58	https://github.com/google/kasan.git usb-fuzzer	f0df5c1b	13dcda9b	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/13 05:00	https://github.com/google/kasan.git usb-fuzzer	f0df5c1b	40fa42bc	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/12 11:29	https://github.com/google/kasan.git usb-fuzzer	f0df5c1b	0b7672ee	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/12 09:26	https://github.com/google/kasan.git usb-fuzzer	f0df5c1b	0b7672ee	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/09/11 07:35	https://github.com/google/kasan.git usb-fuzzer	f0df5c1b	a60cb4cd	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/06/03 11:33	https://github.com/google/kasan.git usb-fuzzer	69bbe8c7	63bf051f	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/06/01 15:50	https://github.com/google/kasan.git usb-fuzzer	69bbe8c7	53c81ea5	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/05/30 23:22	https://github.com/google/kasan.git usb-fuzzer	69bbe8c7	d9aaf3c2	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/05/30 01:29	https://github.com/google/kasan.git usb-fuzzer	69bbe8c7	d9aaf3c2	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/05/29 15:36	https://github.com/google/kasan.git usb-fuzzer	69bbe8c7	f5a25d38	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk
ci2-upstream-usb	2019/05/28 02:35	https://github.com/google/kasan.git usb-fuzzer	69bbe8c7	6bd61501	.config	log	report			linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk