KASAN: use-after-free Read in ila_nf

[upstream] KASAN: use-after-free Read in ila_nf_input
Status: upstream: reported on 2019/01/15 16:47
Reported-by: syzbot+03a25358f4cba0bc4cb6@syzkaller.appspotmail.com
First crash: 35d, last: 2d10h

Sample crash report:

==================================================================
BUG: KASAN: use-after-free in rht_key_hashfn include/linux/rhashtable.h:143 [inline]
BUG: KASAN: use-after-free in __rhashtable_lookup include/linux/rhashtable.h:492 [inline]
BUG: KASAN: use-after-free in rhashtable_lookup include/linux/rhashtable.h:534 [inline]
BUG: KASAN: use-after-free in rhashtable_lookup_fast include/linux/rhashtable.h:560 [inline]
BUG: KASAN: use-after-free in ila_lookup_wildcards net/ipv6/ila/ila_xlat.c:133 [inline]
BUG: KASAN: use-after-free in ila_xlat_addr net/ipv6/ila/ila_xlat.c:658 [inline]
BUG: KASAN: use-after-free in ila_nf_input+0xcd7/0xe00 net/ipv6/ila/ila_xlat.c:191
Read of size 4 at addr ffff88806f3361cc by task ksoftirqd/0/9

CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.0.0-rc5+ #77
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+0x172/0x1f0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:134
 rht_key_hashfn include/linux/rhashtable.h:143 [inline]
 __rhashtable_lookup include/linux/rhashtable.h:492 [inline]
 rhashtable_lookup include/linux/rhashtable.h:534 [inline]
 rhashtable_lookup_fast include/linux/rhashtable.h:560 [inline]
 ila_lookup_wildcards net/ipv6/ila/ila_xlat.c:133 [inline]
 ila_xlat_addr net/ipv6/ila/ila_xlat.c:658 [inline]
 ila_nf_input+0xcd7/0xe00 net/ipv6/ila/ila_xlat.c:191
 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
 nf_hook_slow+0xbf/0x1f0 net/netfilter/core.c:511
 nf_hook include/linux/netfilter.h:244 [inline]
 NF_HOOK include/linux/netfilter.h:287 [inline]
 br_nf_pre_routing_ipv6+0x50a/0x740 net/bridge/br_netfilter_ipv6.c:238
 br_nf_pre_routing+0xe80/0x13a0 net/bridge/br_netfilter_hooks.c:482
 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
 nf_hook_slow+0xbf/0x1f0 net/netfilter/core.c:511
 nf_hook include/linux/netfilter.h:244 [inline]
 NF_HOOK include/linux/netfilter.h:287 [inline]
 br_handle_frame+0x95b/0x1450 net/bridge/br_input.c:305
 __netif_receive_skb_core+0xa96/0x3010 net/core/dev.c:4902
 __netif_receive_skb_one_core+0xa8/0x1a0 net/core/dev.c:4971
 __netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083
 process_backlog+0x206/0x750 net/core/dev.c:5923
 napi_poll net/core/dev.c:6346 [inline]
 net_rx_action+0x4fa/0x1070 net/core/dev.c:6412
 __do_softirq+0x266/0x95a kernel/softirq.c:292
 run_ksoftirqd kernel/softirq.c:654 [inline]
 run_ksoftirqd+0x8e/0x110 kernel/softirq.c:646
 smpboot_thread_fn+0x6ab/0xa10 kernel/smpboot.c:164
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Allocated by task 7757:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_kmalloc mm/kasan/common.c:496 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504
 __do_kmalloc_node mm/slab.c:3673 [inline]
 __kmalloc_node+0x4e/0x70 mm/slab.c:3680
 kmalloc_node include/linux/slab.h:588 [inline]
 kvmalloc_node+0x68/0x100 mm/util.c:416
 kvmalloc include/linux/mm.h:604 [inline]
 kvzalloc include/linux/mm.h:612 [inline]
 bucket_table_alloc+0x3f/0x450 lib/rhashtable.c:176
 rhashtable_rehash_alloc+0x70/0x100 lib/rhashtable.c:353
 rhashtable_shrink lib/rhashtable.c:397 [inline]
 rht_deferred_worker+0x15ac/0x1a40 lib/rhashtable.c:415
 process_one_work+0x98e/0x1790 kernel/workqueue.c:2173
 worker_thread+0x98/0xe40 kernel/workqueue.c:2319
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Freed by task 21:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466
 __cache_free mm/slab.c:3487 [inline]
 kfree+0xcf/0x230 mm/slab.c:3806
 kvfree+0x61/0x70 mm/util.c:445
 bucket_table_free+0x93/0x180 lib/rhashtable.c:108
 rhashtable_free_and_destroy+0x155/0x8f0 lib/rhashtable.c:1163
 ila_xlat_exit_net+0x1a4/0x360 net/ipv6/ila/ila_xlat.c:632
 ila_exit_net+0x16/0x20 net/ipv6/ila/ila_main.c:75
 ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:153
 cleanup_net+0x3fb/0x960 net/core/net_namespace.c:551
 process_one_work+0x98e/0x1790 kernel/workqueue.c:2173
 worker_thread+0x98/0xe40 kernel/workqueue.c:2319
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff88806f3361c0
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 12 bytes inside of
 4096-byte region [ffff88806f3361c0, ffff88806f3371c0)
The buggy address belongs to the page:
page:ffffea0001bccd80 count:1 mapcount:0 mapping:ffff88812c3f0dc0 index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea000196de08 ffffea00027ebc88 ffff88812c3f0dc0
raw: 0000000000000000 ffff88806f3361c0 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88806f336080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88806f336100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88806f336180: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                              ^
 ffff88806f336200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88806f336280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

All crashes (7):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci-upstream-net-this-kasan-gce	2019/02/14 23:00	net	8d6ea932	76dd003f	.config	log	report	davem@davemloft.net, keescook@chromium.org, ktkhai@virtuozzo.com, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, stephen@networkplumber.org, tom@herbertland.com, yoshfuji@linux-ipv6.org
ci-upstream-net-this-kasan-gce	2019/02/03 18:28	net	c14f07c6	c198d5dd	.config	log	report	davem@davemloft.net, keescook@chromium.org, ktkhai@virtuozzo.com, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, stephen@networkplumber.org, tom@herbertland.com, yoshfuji@linux-ipv6.org
ci-upstream-net-this-kasan-gce	2019/01/31 15:38	net	3aa9179b	0e8ea0a3	.config	log	report	davem@davemloft.net, keescook@chromium.org, ktkhai@virtuozzo.com, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, stephen@networkplumber.org, tom@herbertland.com, yoshfuji@linux-ipv6.org
ci-upstream-bpf-next-kasan-gce	2019/01/15 13:34	bpf-next	b71acb0e	ebacf5cb	.config	log	report	davem@davemloft.net, keescook@chromium.org, ktkhai@virtuozzo.com, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, stephen@networkplumber.org, tom@herbertland.com, yoshfuji@linux-ipv6.org
ci-upstream-net-kasan-gce	2019/02/17 09:05	net-next	f2281c24	f42dee6d	.config	log	report	davem@davemloft.net, keescook@chromium.org, ktkhai@virtuozzo.com, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, stephen@networkplumber.org, tom@herbertland.com, yoshfuji@linux-ipv6.org
ci-upstream-net-kasan-gce	2019/02/16 16:58	net-next	bb015f22	f42dee6d	.config	log	report	davem@davemloft.net, keescook@chromium.org, ktkhai@virtuozzo.com, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, stephen@networkplumber.org, tom@herbertland.com, yoshfuji@linux-ipv6.org
ci-upstream-net-kasan-gce	2019/02/03 00:26	net-next	a68a8481	c198d5dd	.config	log	report	davem@davemloft.net, keescook@chromium.org, ktkhai@virtuozzo.com, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, stephen@networkplumber.org, tom@herbertland.com, yoshfuji@linux-ipv6.org