[syzbot] [net?] KASAN: use-after-free Read in rhashtable_lookup_fast (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3e9bc0472b91 Merge branch 'bpf: Add BPF_PROG_TYPE_CGROUP_S..
git tree: bpf
console output: https://syzkaller.appspot.com/x/log.txt?x=1209e85c980000
kernel config: https://syzkaller.appspot.com/x/.config?x=98d5a8e00ed1044a
dashboard link: https://syzkaller.appspot.com/bug?extid=128aaac913636290e5a9
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b4d98ec9bb7b/disk-3e9bc047.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/df7961b4e331/vmlinux-3e9bc047.xz
kernel image: https://storage.googleapis.com/syzbot-assets/be4e509c6f1b/bzImage-3e9bc047.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+128aaa...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in rht_key_hashfn include/linux/rhashtable.h:159 [inline]
BUG: KASAN: use-after-free in __rhashtable_lookup include/linux/rhashtable.h:604 [inline]
BUG: KASAN: use-after-free in rhashtable_lookup include/linux/rhashtable.h:646 [inline]
BUG: KASAN: use-after-free in rhashtable_lookup_fast+0x77a/0x9b0 include/linux/rhashtable.h:672
Read of size 4 at addr ffff888058fe8008 by task kworker/1:9/5947

CPU: 1 PID: 5947 Comm: kworker/1:9 Not tainted 6.9.0-rc5-syzkaller-00185-g3e9bc0472b91 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Workqueue: wg-crypt-wg1 wg_packet_encrypt_worker
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
rht_key_hashfn include/linux/rhashtable.h:159 [inline]
__rhashtable_lookup include/linux/rhashtable.h:604 [inline]
rhashtable_lookup include/linux/rhashtable.h:646 [inline]
rhashtable_lookup_fast+0x77a/0x9b0 include/linux/rhashtable.h:672
ila_lookup_wildcards net/ipv6/ila/ila_xlat.c:132 [inline]
ila_xlat_addr net/ipv6/ila/ila_xlat.c:652 [inline]
ila_nf_input+0x1fe/0x3c0 net/ipv6/ila/ila_xlat.c:190
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626
nf_hook include/linux/netfilter.h:269 [inline]
NF_HOOK+0x29e/0x450 include/linux/netfilter.h:312
__netif_receive_skb_one_core net/core/dev.c:5544 [inline]
__netif_receive_skb+0x1ea/0x650 net/core/dev.c:5658
process_backlog+0x39d/0x7a0 net/core/dev.c:5987
__napi_poll+0xcb/0x490 net/core/dev.c:6638
napi_poll net/core/dev.c:6707 [inline]
net_rx_action+0x7bb/0x1090 net/core/dev.c:6822
__do_softirq+0x2c6/0x980 kernel/softirq.c:554
do_softirq+0x11b/0x1e0 kernel/softirq.c:455
</IRQ>
<TASK>
__local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382
spin_unlock_bh include/linux/spinlock.h:396 [inline]
ptr_ring_consume_bh include/linux/ptr_ring.h:367 [inline]
wg_packet_encrypt_worker+0x2e8/0x1610 drivers/net/wireguard/send.c:293
process_one_work kernel/workqueue.c:3254 [inline]
process_scheduled_works+0xa10/0x17c0 kernel/workqueue.c:3335
worker_thread+0x86d/0xd70 kernel/workqueue.c:3416
kthread+0x2f0/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x58fe8
flags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff)
page_type: 0xffffffff()
raw: 00fff80000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x152dc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_ZERO), pid 11308, tgid -1154580940 (syz-executor.4), ts 11308, free_ts 301906279236
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1534
prep_new_page mm/page_alloc.c:1541 [inline]
get_page_from_freelist+0x3410/0x35b0 mm/page_alloc.c:3317
__alloc_pages+0x256/0x6c0 mm/page_alloc.c:4575
__alloc_pages_node include/linux/gfp.h:238 [inline]
alloc_pages_node include/linux/gfp.h:261 [inline]
__kmalloc_large_node+0x91/0x1f0 mm/slub.c:3911
__do_kmalloc_node mm/slub.c:3954 [inline]
__kmalloc_node+0x33e/0x4e0 mm/slub.c:3973
kmalloc_node include/linux/slab.h:648 [inline]
kvmalloc_node+0x72/0x190 mm/util.c:634
kvmalloc include/linux/slab.h:766 [inline]
kvzalloc include/linux/slab.h:774 [inline]
bucket_table_alloc lib/rhashtable.c:184 [inline]
rhashtable_init+0x558/0xa90 lib/rhashtable.c:1065
ila_xlat_init_net+0xa0/0x110 net/ipv6/ila/ila_xlat.c:613
ops_init+0x352/0x610 net/core/net_namespace.c:136
setup_net+0x515/0xca0 net/core/net_namespace.c:340
copy_net_ns+0x4e4/0x7b0 net/core/net_namespace.c:505
create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
ksys_unshare+0x619/0xc10 kernel/fork.c:3323
__do_sys_unshare kernel/fork.c:3394 [inline]
__se_sys_unshare kernel/fork.c:3392 [inline]
__x64_sys_unshare+0x38/0x40 kernel/fork.c:3392
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
page last free pid 1100 tgid 1100 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1141 [inline]
free_unref_page_prepare+0x986/0xab0 mm/page_alloc.c:2347
free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487
__folio_put_large+0x13f/0x190 mm/swap.c:132
__folio_put+0x299/0x390 mm/swap.c:140
folio_put include/linux/mm.h:1506 [inline]
free_large_kmalloc+0x105/0x1c0 mm/slub.c:4361
kfree+0x1ca/0x3a0 mm/slub.c:4384
rhashtable_free_and_destroy+0x7c6/0x920 lib/rhashtable.c:1163
ila_xlat_exit_net+0x55/0x110 net/ipv6/ila/ila_xlat.c:626
ops_exit_list net/core/net_namespace.c:170 [inline]
cleanup_net+0x802/0xcc0 net/core/net_namespace.c:637
process_one_work kernel/workqueue.c:3254 [inline]
process_scheduled_works+0xa10/0x17c0 kernel/workqueue.c:3335
worker_thread+0x86d/0xd70 kernel/workqueue.c:3416
kthread+0x2f0/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Memory state around the buggy address:
ffff888058fe7f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff888058fe7f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888058fe8000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff888058fe8080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff888058fe8100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup