KASAN: slab-out-of-bounds Read in tcp_retransmit

KASAN: slab-out-of-bounds Read in tcp_retransmit_timer
Status: auto-closed as invalid on 2021/01/18 22:17
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 516d, last: 275d

similar bugs (3):
Kernel	Title	Count	Last	Reported	Patched	Status
linux-4.14	KASAN: slab-out-of-bounds Read in tcp_retransmit_timer	5	75d	150d	0/1	upstream: reported on 2021/02/23 02:09
upstream	KASAN: use-after-free Read in tcp_retransmit_timer (5)	2130	now	515d	0/22	upstream: reported on 2020/02/24 07:40
linux-4.19	KASAN: use-after-free Read in tcp_retransmit_timer (2)	6	4d12h	171d	0/1	upstream: reported on 2021/02/02 04:20

Sample crash report:

==================================================================
BUG: KASAN: slab-out-of-bounds in tcp_retransmit_timer+0x6e9/0x1cb0 net/ipv4/tcp_timer.c:500
Read of size 8 at addr ffff888094a5a350 by task syz-executor.3/11021

CPU: 1 PID: 11021 Comm: syz-executor.3 Not tainted 5.9.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d6/0x29e lib/dump_stack.c:118
 print_address_description+0x66/0x620 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report+0x132/0x1d0 mm/kasan/report.c:530
 tcp_retransmit_timer+0x6e9/0x1cb0 net/ipv4/tcp_timer.c:500
 tcp_write_timer_handler+0x1dc/0x8c0 net/ipv4/tcp_timer.c:611
 tcp_write_timer+0x168/0x280 net/ipv4/tcp_timer.c:631
 call_timer_fn+0x91/0x160 kernel/time/timer.c:1413
 expire_timers kernel/time/timer.c:1458 [inline]
 __run_timers+0x65e/0x830 kernel/time/timer.c:1755
 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1768
 __do_softirq+0x256/0x6d5 kernel/softirq.c:298
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x8f/0xe0 arch/x86/kernel/irq_64.c:77
 do_softirq+0x102/0x150 kernel/softirq.c:343
 __local_bh_enable_ip+0x17f/0x1c0 kernel/softirq.c:195
 get_next_corpse net/netfilter/nf_conntrack_core.c:2226 [inline]
 nf_ct_iterate_cleanup+0x307/0x390 net/netfilter/nf_conntrack_core.c:2249
 nf_ct_iterate_cleanup_net+0xfc/0x150 net/netfilter/nf_conntrack_core.c:2334
 masq_device_event+0x9b/0xd0 net/netfilter/nf_nat_masquerade.c:88
 notifier_call_chain kernel/notifier.c:83 [inline]
 __raw_notifier_call_chain kernel/notifier.c:361 [inline]
 raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:368
 __dev_notify_flags+0x253/0x4d0 net/core/dev.c:2033
 dev_change_flags+0xe3/0x190 net/core/dev.c:8424
 dev_ifsioc+0xc7/0xac0 net/core/dev_ioctl.c:265
 dev_ioctl+0x4d1/0xc70 net/core/dev_ioctl.c:511
 sock_do_ioctl+0x169/0x260 net/socket.c:1070
 sock_ioctl+0x4aa/0x690 net/socket.c:1198
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45de29
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f53c161bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000000133c0 RCX: 000000000045de29
RDX: 0000000020000340 RSI: 0000000000008914 RDI: 0000000000000005
RBP: 000000000118c008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bfd4
R13: 00007ffc2528cc3f R14: 00007f53c161c9c0 R15: 000000000118bfd4

Allocated by task 10941:
 kasan_save_stack mm/kasan/common.c:48 [inline]
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc+0x100/0x130 mm/kasan/common.c:461
 slab_post_alloc_hook+0x3e/0x290 mm/slab.h:518
 slab_alloc mm/slab.c:3316 [inline]
 kmem_cache_alloc+0x1c1/0x2d0 mm/slab.c:3486
 getname_flags+0xb8/0x610 fs/namei.c:138
 user_path_at_empty+0x28/0x50 fs/namei.c:2646
 user_path_at include/linux/namei.h:59 [inline]
 vfs_statx+0xb9/0x380 fs/stat.c:202
 vfs_lstat include/linux/fs.h:3178 [inline]
 __do_sys_newlstat fs/stat.c:374 [inline]
 __se_sys_newlstat fs/stat.c:368 [inline]
 __x64_sys_newlstat+0x81/0xd0 fs/stat.c:368
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 10941:
 kasan_save_stack mm/kasan/common.c:48 [inline]
 kasan_set_track+0x3d/0x70 mm/kasan/common.c:56
 kasan_set_free_info+0x17/0x30 mm/kasan/generic.c:355
 __kasan_slab_free+0xdd/0x110 mm/kasan/common.c:422
 __cache_free mm/slab.c:3422 [inline]
 kmem_cache_free+0x82/0xf0 mm/slab.c:3697
 putname fs/namei.c:259 [inline]
 filename_lookup+0x410/0x5d0 fs/namei.c:2376
 user_path_at include/linux/namei.h:59 [inline]
 vfs_statx+0xb9/0x380 fs/stat.c:202
 vfs_lstat include/linux/fs.h:3178 [inline]
 __do_sys_newlstat fs/stat.c:374 [inline]
 __se_sys_newlstat fs/stat.c:368 [inline]
 __x64_sys_newlstat+0x81/0xd0 fs/stat.c:368
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888094a5ae00
 which belongs to the cache names_cache of size 4096
The buggy address is located 2736 bytes to the left of
 4096-byte region [ffff888094a5ae00, ffff888094a5be00)
The buggy address belongs to the page:
page:00000000644f8c62 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x94a5a
head:00000000644f8c62 order:1 compound_mapcount:0
flags: 0xfffe0000010200(slab|head)
raw: 00fffe0000010200 ffffea0001556308 ffffea00011e0388 ffff8880aa624d00
raw: 0000000000000000 ffff888094a5ae00 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888094a5a200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888094a5a280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888094a5a300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                 ^
 ffff888094a5a380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888094a5a400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (90):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info
ci-upstream-kasan-gce-smack-root	2020/10/06 06:02	upstream	7575fdda569b	1880b4a9	.config	log	report	info
ci-upstream-kasan-gce-root	2020/09/29 23:25	upstream	ccc1d052eff9	5abc3f1a	.config	log	report	info
ci-upstream-bpf-kasan-gce	2020/10/19 18:34	bpf	9ff9b0d392ea	ff4a3345	.config	log	report	info
ci-upstream-bpf-kasan-gce	2020/10/16 15:14	bpf	28802e7c0c99	6e262c73	.config	log	report	info
ci-upstream-bpf-kasan-gce	2020/10/15 13:48	bpf	28802e7c0c99	63869021	.config	log	report	info
ci-upstream-bpf-kasan-gce	2020/10/13 00:54	bpf	28802e7c0c99	d32b0bbf	.config	log	report	info
ci-upstream-bpf-kasan-gce	2020/10/05 06:37	bpf	d82a532a6115	5ef9c291	.config	log	report	info
ci-upstream-bpf-kasan-gce	2020/09/26 17:51	bpf	87f92ac4c127	2d5ea0cb	.config	log	report	info
ci-upstream-bpf-kasan-gce	2020/09/12 05:01	bpf	fde6dedfb794	79fb24e2	.config	log	report
ci-upstream-bpf-kasan-gce	2020/09/09 18:51	bpf	746f534a4809	0ea7a887	.config	log	report
ci-upstream-bpf-kasan-gce	2020/09/07 21:17	bpf	e6135df45e21	abf9ba4f	.config	log	report
ci-upstream-bpf-kasan-gce	2020/09/07 00:24	bpf	e6135df45e21	abf9ba4f	.config	log	report
ci-upstream-bpf-kasan-gce	2020/09/06 08:18	bpf	e6135df45e21	abf9ba4f	.config	log	report
ci-upstream-bpf-kasan-gce	2020/08/31 11:45	bpf	fa4505675e09	d5a3ae1f	.config	log	report
ci-upstream-bpf-kasan-gce	2020/08/30 11:59	bpf	fa4505675e09	d5a3ae1f	.config	log	report
ci-upstream-bpf-kasan-gce	2020/08/29 10:08	bpf	fa4505675e09	d5a3ae1f	.config	log	report
ci-upstream-bpf-kasan-gce	2020/08/29 03:35	bpf	fa4505675e09	d5a3ae1f	.config	log	report
ci-upstream-bpf-kasan-gce	2020/08/28 22:17	bpf	fa4505675e09	d5a3ae1f	.config	log	report
ci-upstream-bpf-kasan-gce	2020/08/25 15:00	bpf	7787b6fc938e	344da168	.config	log	report
ci-upstream-bpf-kasan-gce	2020/08/22 12:03	bpf	4af7b32f84aa	6436ce4b	.config	log	report
ci-upstream-bpf-kasan-gce	2020/08/22 02:42	bpf	4af7b32f84aa	6436ce4b	.config	log	report
ci-upstream-bpf-kasan-gce	2020/07/07 07:40	bpf	ad4e2b648397	51095195	.config	log	report
ci-upstream-bpf-kasan-gce	2020/07/03 07:19	bpf	e708e2bd55c9	bed10395	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/25 09:42	bpf	4e15507fea70	54566aff	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/25 00:00	bpf	4e15507fea70	54566aff	.config	log	report
ci-upstream-bpf-kasan-gce	2020/06/12 15:06	bpf	2c4779eff837	58802067	.config	log	report
ci-upstream-bpf-kasan-gce	2020/04/18 05:39	bpf	edadedf1c5b4	435c6d53	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/10/20 22:12	bpf-next	9ff9b0d392ea	ff4a3345	.config	log	report	info
ci-upstream-bpf-next-kasan-gce	2020/10/11 16:35	bpf-next	ac53a0d3107c	4a77ae0b	.config	log	report	info
ci-upstream-bpf-next-kasan-gce	2020/10/11 11:53	bpf-next	ac53a0d3107c	4a77ae0b	.config	log	report	info
ci-upstream-bpf-next-kasan-gce	2020/10/11 07:11	bpf-next	ac53a0d3107c	4a77ae0b	.config	log	report	info
ci-upstream-bpf-next-kasan-gce	2020/10/11 02:15	bpf-next	ac53a0d3107c	4a77ae0b	.config	log	report	info
ci-upstream-bpf-next-kasan-gce	2020/10/11 01:01	bpf-next	ac53a0d3107c	4a77ae0b	.config	log	report	info
ci-upstream-bpf-next-kasan-gce	2020/10/01 02:37	bpf-next	b0efc216f577	8516f6d3	.config	log	report	info
ci-upstream-bpf-next-kasan-gce	2020/09/28 14:32	bpf-next	ba5f4cfeac77	6bfdbe89	.config	log	report	info
ci-upstream-bpf-next-kasan-gce	2020/09/24 23:55	bpf-next	0789e13bc3f8	54289b08	.config	log	report	info
ci-upstream-bpf-next-kasan-gce	2020/09/24 20:17	bpf-next	0789e13bc3f8	54289b08	.config	log	report	info
ci-upstream-bpf-next-kasan-gce	2020/09/24 06:22	bpf-next	0789e13bc3f8	54289b08	.config	log	report	info
ci-upstream-net-kasan-gce	2020/09/22 23:22	net-next	92ec804f3dbf	3e8f6c27	.config	log	report	info
ci-upstream-bpf-next-kasan-gce	2020/09/20 10:42	bpf-next	70b971118e07	53ce8104	.config	log	report	info
ci-upstream-bpf-next-kasan-gce	2020/09/20 09:14	bpf-next	70b971118e07	53ce8104	.config	log	report	info
ci-upstream-bpf-next-kasan-gce	2020/09/13 03:42	bpf-next	2bab48c5bef0	ce441f06	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/09/11 17:04	bpf-next	18841da98100	adfb8b4e	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/09/11 03:27	bpf-next	8081ede1f731	409809d8	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/09/10 06:16	bpf-next	7fb5eefd7639	409809d8	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/09/08 15:50	bpf-next	bc0b5a03079b	abf9ba4f	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/09/07 05:08	bpf-next	f9bec5d756b3	abf9ba4f	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/09/06 03:44	bpf-next	f9bec5d756b3	abf9ba4f	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/09/05 19:58	bpf-next	f9bec5d756b3	abf9ba4f	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/09/05 18:53	bpf-next	f9bec5d756b3	abf9ba4f	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/09/05 03:39	bpf-next	95cec14b0308	abf9ba4f	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/09/04 05:49	bpf-next	83cf5c68d663	abf9ba4f	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/09/02 19:14	bpf-next	968be23ceaca	abf9ba4f	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/08/31 07:43	bpf-next	10496f261ed3	d5a3ae1f	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/08/28 07:22	bpf-next	2e80be60c465	816e0689	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/08/27 22:23	bpf-next	2e80be60c465	816e0689	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/08/26 17:36	bpf-next	cd04b04de119	318430cb	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/08/26 03:29	bpf-next	0fcdfffe8034	344da168	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/08/24 23:58	bpf-next	9c0f8cbdc0e9	67b599d1	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/08/22 15:46	bpf-next	9c0f8cbdc0e9	6436ce4b	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/06/29 03:55	bpf-next	cb8e59cc8720	a2cdad9d	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/06/18 17:46	bpf-next	cb8e59cc8720	d45a4d69	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/05/23 20:02	bpf-next	a5dfaa2ab940	9682898d	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/05/22 13:32	bpf-next	29ae90d22175	5afa2ddd	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/05/20 05:51	bpf-next	dda18a5c0b75	67fa1f59	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/05/17 08:19	bpf-next	96586dd9268d	37bccd4e	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/04/15 11:59	bpf-next	1a323ea5356e	3f3c5574	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/02/23 09:29	bpf-next	8eece07c011f	2c36e7a7	.config	log	report