KASAN: use-after-free Read in ccid2_hc_tx_packet

KASAN: use-after-free Read in ccid2_hc_tx_packet_recv
Status: upstream: reported C repro on 2018/04/02 09:20
Reported-by: syzbot+554ccde221001ab5479a@syzkaller.appspotmail.com
First crash: 1070d, last: 256d

Cause bisection: introduced by (bisect log) :
commit 3fa6f616a7a4d0bdf4d877d530456d8a5c3b109b
Author: David Ahern <dsahern@gmail.com>
Date: Mon Aug 7 15:44:17 2017 +0000

net: ipv4: add second dif to inet socket lookups

Crash: KASAN: use-after-free Read in ccid2_hc_tx_packet_recv (log)
Repro: C syz .config

Fix bisection: failed (bisect log)

similar bugs (3):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.14	KASAN: use-after-free Read in ccid2_hc_tx_packet_recv (2)	C	done	inconclusive	3	275d	483d	0/1	upstream: reported C repro on 2019/11/09 21:41
linux-4.14	KASAN: use-after-free Read in ccid2_hc_tx_packet_recv				1	634d	634d	0/1	auto-closed as invalid on 2019/10/25 08:37
linux-4.19	KASAN: use-after-free Read in ccid2_hc_tx_packet_recv	C	done	error	2	268d	488d	0/1	upstream: reported C repro on 2019/11/04 11:20

Sample crash report:

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+0x1b9/0x294 lib/dump_stack.c:113
==================================================================
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
BUG: KASAN: use-after-free in ccid2_hc_tx_packet_recv+0x2383/0x275e net/dccp/ccids/ccid2.c:597
Read of size 1 at addr ffff8801ba4911c2 by task syz-executor940/4542

 __should_failslab+0x124/0x180 mm/failslab.c:32
 should_failslab+0x9/0x14 mm/slab_common.c:1522
 slab_pre_alloc_hook mm/slab.h:423 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 kmem_cache_alloc_trace+0x4b/0x780 mm/slab.c:3618
 kmalloc include/linux/slab.h:512 [inline]
 dccp_ackvec_parsed_add+0xa1/0x310 net/dccp/ackvec.c:352
 ccid2_hc_tx_parse_options+0x9a/0xb0 net/dccp/ccids/ccid2.c:510
 ccid_hc_tx_parse_options net/dccp/ccid.h:207 [inline]
 dccp_parse_options+0x658/0x11f0 net/dccp/options.c:233
 dccp_rcv_established+0x44/0xb0 net/dccp/input.c:374
 dccp_v4_do_rcv+0x153/0x180 net/dccp/ipv4.c:654
 sk_backlog_rcv include/net/sock.h:909 [inline]
 __release_sock+0x12f/0x3a0 net/core/sock.c:2335
 release_sock+0xa4/0x2b0 net/core/sock.c:2850
 dccp_sendmsg+0x771/0x1020 net/dccp/proto.c:820
 inet_sendmsg+0x19f/0x690 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:639
 ___sys_sendmsg+0x525/0x940 net/socket.c:2117
 __sys_sendmmsg+0x240/0x6f0 net/socket.c:2212
 __do_sys_sendmmsg net/socket.c:2241 [inline]
 __se_sys_sendmmsg net/socket.c:2238 [inline]
 __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2238
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441819
RSP: 002b:00007ffdb9a9df08 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441819
RDX: 04000000000001e6 RSI: 0000000020000c00 RDI: 0000000000000005
RBP: 00007ffdb9a9df20 R08: 0000000000000002 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
R13: 04000000000001e6 R14: 0000000000000006 R15: 0000000000000000
CPU: 0 PID: 4542 Comm: syz-executor940 Not tainted 4.17.0-rc6+ #66
dccp_parse_options: DCCP(        (ptrval)): Option 38 (len=1) error=5
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+0x1b9/0x294 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430
 ccid2_hc_tx_packet_recv+0x2383/0x275e net/dccp/ccids/ccid2.c:597
 ccid_hc_tx_packet_recv net/dccp/ccid.h:192 [inline]
 dccp_deliver_input_to_ccids+0x203/0x280 net/dccp/input.c:186
 dccp_rcv_established+0x87/0xb0 net/dccp/input.c:378
 dccp_v4_do_rcv+0x153/0x180 net/dccp/ipv4.c:654
 sk_backlog_rcv include/net/sock.h:909 [inline]
 __release_sock+0x12f/0x3a0 net/core/sock.c:2335
 release_sock+0xa4/0x2b0 net/core/sock.c:2850
 dccp_sendmsg+0x771/0x1020 net/dccp/proto.c:820
 inet_sendmsg+0x19f/0x690 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:639
 ___sys_sendmsg+0x525/0x940 net/socket.c:2117
 __sys_sendmmsg+0x240/0x6f0 net/socket.c:2212
 __do_sys_sendmmsg net/socket.c:2241 [inline]
 __se_sys_sendmmsg net/socket.c:2238 [inline]
 __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2238
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441819
RSP: 002b:00007ffdb9a9df08 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441819
RDX: 04000000000001e6 RSI: 0000000020000c00 RDI: 0000000000000005
RBP: 00007ffdb9a9df20 R08: 0000000000000002 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
R13: 04000000000001e6 R14: 0000000000000006 R15: 0000000000000000

Allocated by task 4542:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 __do_kmalloc_node mm/slab.c:3682 [inline]
 __kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3696
 __kmalloc_reserve.isra.38+0x3a/0xe0 net/core/skbuff.c:137
 __alloc_skb+0x14d/0x780 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:987 [inline]
 dccp_send_ack+0xd2/0x340 net/dccp/output.c:580
 ccid2_hc_rx_packet_recv+0x139/0x1b0 net/dccp/ccids/ccid2.c:776
 ccid_hc_rx_packet_recv net/dccp/ccid.h:185 [inline]
 dccp_deliver_input_to_ccids+0xf0/0x280 net/dccp/input.c:180
 dccp_rcv_established+0x87/0xb0 net/dccp/input.c:378
 dccp_v4_do_rcv+0x153/0x180 net/dccp/ipv4.c:654
 sk_backlog_rcv include/net/sock.h:909 [inline]
 __sk_receive_skb+0x3a2/0xd60 net/core/sock.c:513
 dccp_v4_rcv+0x10e5/0x1f3f net/dccp/ipv4.c:875
 ip_local_deliver_finish+0x2e3/0xd80 net/ipv4/ip_input.c:215
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip_local_deliver+0x1e1/0x720 net/ipv4/ip_input.c:256
 dst_input include/net/dst.h:450 [inline]
 ip_rcv_finish+0x81b/0x2200 net/ipv4/ip_input.c:396
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip_rcv+0xb70/0x143d net/ipv4/ip_input.c:492
 __netif_receive_skb_core+0x26f5/0x3630 net/core/dev.c:4592
 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:4657
 process_backlog+0x219/0x760 net/core/dev.c:5337
 napi_poll net/core/dev.c:5735 [inline]
 net_rx_action+0x7b7/0x1930 net/core/dev.c:5801
 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285

Freed by task 4542:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xd9/0x260 mm/slab.c:3813
 skb_free_head+0x99/0xc0 net/core/skbuff.c:550
 skb_release_data+0x690/0x860 net/core/skbuff.c:570
 skb_release_all+0x4a/0x60 net/core/skbuff.c:627
 __kfree_skb net/core/skbuff.c:641 [inline]
 kfree_skb+0x195/0x560 net/core/skbuff.c:659
 dccp_v4_do_rcv+0x12b/0x180 net/dccp/ipv4.c:689
 sk_backlog_rcv include/net/sock.h:909 [inline]
 __release_sock+0x12f/0x3a0 net/core/sock.c:2335
 release_sock+0xa4/0x2b0 net/core/sock.c:2850
 dccp_sendmsg+0x771/0x1020 net/dccp/proto.c:820
 inet_sendmsg+0x19f/0x690 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:639
 ___sys_sendmsg+0x525/0x940 net/socket.c:2117
 __sys_sendmmsg+0x240/0x6f0 net/socket.c:2212
 __do_sys_sendmmsg net/socket.c:2241 [inline]
 __se_sys_sendmmsg net/socket.c:2238 [inline]
 __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2238
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8801ba490d40
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 1154 bytes inside of
 2048-byte region [ffff8801ba490d40, ffff8801ba491540)
The buggy address belongs to the page:
page:ffffea0006e92400 count:1 mapcount:0 mapping:ffff8801ba4904c0 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801ba4904c0 0000000000000000 0000000100000003
raw: ffffea0006ed9a20 ffffea0006fa5fa0 ffff8801da800c40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801ba491080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801ba491100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801ba491180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff8801ba491200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801ba491280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (93):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro
ci-upstream-kasan-gce	2018/05/25 13:51	upstream	b5069438	f48c20b8	.config	log	report	syz	C
ci-upstream-kasan-gce	2020/05/21 09:50	upstream	b85051e7	c61086ab	.config	log	report
ci-upstream-kasan-gce	2020/01/28 23:14	upstream	c677124e	c8e81ce4	.config	log	report
ci-upstream-kasan-gce	2020/01/25 04:48	upstream	6381b442	2e95ab33	.config	log	report
ci-upstream-kasan-gce-root	2020/01/15 23:46	upstream	51d69817	f9b69507	.config	log	report
ci-upstream-kasan-gce	2019/09/14 02:20	upstream	a7f89616	32d59357	.config	log	report
ci-upstream-kasan-gce	2019/08/22 00:58	upstream	bb7ba806	984250d5	.config	log	report
ci-upstream-kasan-gce	2019/08/07 21:39	upstream	33920f1e	e6ebef88	.config	log	report
ci-upstream-kasan-gce-root	2019/06/26 03:41	upstream	249155c2	0a8d1a96	.config	log	report
ci-upstream-kasan-gce-smack-root	2019/04/28 04:50	upstream	037904a2	b617407b	.config	log	report
ci-upstream-kasan-gce-selinux-root	2019/03/26 18:38	upstream	a3ac7917	55684ce1	.config	log	report
ci-upstream-kasan-gce	2019/02/14 01:51	upstream	1f947a7a	0a49c954	.config	log	report
ci-upstream-kasan-gce	2019/02/01 20:00	upstream	5b4746a0	0c07abcf	.config	log	report
ci-upstream-kasan-gce	2019/01/27 19:40	upstream	ba606975	c73f090a	.config	log	report
ci-upstream-kasan-gce-smack-root	2019/01/25 04:13	upstream	c04e2a78	bfab9cd8	.config	log	report
ci-upstream-kasan-gce	2019/01/19 01:04	upstream	d7393226	2103a236	.config	log	report
ci-upstream-kasan-gce	2019/01/12 02:08	upstream	de6629eb	c3f3344c	.config	log	report
ci-upstream-kasan-gce	2019/01/08 05:39	upstream	3bd6e94b	69d69aa9	.config	log	report
ci-upstream-kasan-gce	2019/01/06 05:58	upstream	f1c2f885	53be0a37	.config	log	report
ci-upstream-kasan-gce	2018/12/30 20:45	upstream	19530313	9942de5f	.config	log	report
ci-upstream-kasan-gce	2018/12/24 15:29	upstream	8fe28cb5	be79df56	.config	log	report
ci-upstream-kasan-gce	2018/12/19 03:26	upstream	ddfbab46	4edaba93	.config	log	report
ci-upstream-kasan-gce-root	2018/04/05 00:18	upstream	3e968c9f	676bd07e	.config	log	report
ci-upstream-kasan-gce-386	2019/08/12 05:22	upstream	296d05cb	acb51638	.config	log	report
ci-upstream-kasan-gce-386	2018/04/02 00:13	upstream	0adb3285	dc889257	.config	log	report
ci-upstream-net-this-kasan-gce	2019/10/02 07:01	net	569aad4f	b7a87a83	.config	log	report
ci-upstream-net-this-kasan-gce	2019/08/08 02:40	net	33920f1e	e6ebef88	.config	log	report
ci-upstream-net-this-kasan-gce	2019/05/02 06:55	net	d2f0c961	7516d9fa	.config	log	report
ci-upstream-net-this-kasan-gce	2019/04/29 18:48	net	2ae7a397	b617407b	.config	log	report
ci-upstream-net-this-kasan-gce	2018/12/23 21:59	net	a3ac5817	e3bd7ab8	.config	log	report
ci-upstream-net-kasan-gce	2020/06/23 16:07	net-next	cb8e59cc	54566aff	.config	log	report
ci-upstream-net-kasan-gce	2020/05/20 19:52	net-next	4f65e2f4	1255f02a	.config	log	report
ci-upstream-net-kasan-gce	2020/03/17 17:34	net-next	86e85bf6	749688d2	.config	log	report
ci-upstream-net-kasan-gce	2019/12/21 21:35	net-next	994baea2	bc586918	.config	log	report
ci-upstream-net-kasan-gce	2019/12/11 00:29	net-next	08cbc75f	5a5826a1	.config	log	report
ci-upstream-net-kasan-gce	2019/11/15 04:14	net-next	abfb228a	a24fe792	.config	log	report
ci-upstream-net-kasan-gce	2019/10/14 23:41	net-next	7e0d15ee	05ad7292	.config	log	report
ci-upstream-net-kasan-gce	2019/09/02 01:03	net-next	4bc61b0b	bad3cce2	.config	log	report
ci-upstream-net-kasan-gce	2019/08/10 21:36	net-next	38b9e0f6	acb51638	.config	log	report
ci-upstream-net-kasan-gce	2019/06/27 09:51	net-next	177d935a	7509bf36	.config	log	report
ci-upstream-net-kasan-gce	2019/05/11 03:38	net-next	b970afcf	46caad94	.config	log	report
ci-upstream-net-kasan-gce	2019/04/28 14:10	net-next	b1a79360	b617407b	.config	log	report
ci-upstream-net-kasan-gce	2019/04/26 22:49	net-next	148f025d	b617407b	.config	log	report
ci-upstream-net-kasan-gce	2019/04/23 23:22	net-next	a93f7fe1	4d3d6a50	.config	log	report
ci-upstream-net-kasan-gce	2019/04/21 19:54	net-next	4e54507a	b0e8efcb	.config	log	report
ci-upstream-net-kasan-gce	2019/04/19 06:33	net-next	5e42574b	b0e8efcb	.config	log	report
ci-upstream-net-kasan-gce	2019/04/17 20:24	net-next	3a6f7892	b0e8efcb	.config	log	report
ci-upstream-net-kasan-gce	2019/04/15 07:07	net-next	0ed1d3dd	505ab413	.config	log	report
ci-upstream-net-kasan-gce	2019/04/07 23:08	net-next	f1054c65	c34fde03	.config	log	report
ci-upstream-net-kasan-gce	2019/03/29 00:23	net-next	356d71e0	14c58f8d	.config	log	report
ci-upstream-net-kasan-gce	2019/02/02 00:59	net-next	962c382d	564f9a4f	.config	log	report
ci-upstream-net-kasan-gce	2019/01/19 17:26	net-next	f04d402f	8aa587b0	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2019/09/08 08:29	linux-next	6d028043	a60cb4cd	.config	log	report