==================================================================
BUG: KASAN: use-after-free in rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88805e83842a by task syz-executor/10005

CPU: 0 PID: 10005 Comm: syz-executor Not tainted 5.15.181-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 print_address_description+0x60/0x2d0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xdf/0x130 mm/kasan/report.c:451
 rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
 call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451
 expire_timers kernel/time/timer.c:1496 [inline]
 __run_timers+0x525/0x7c0 kernel/time/timer.c:1767
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
 handle_softirqs+0x328/0x820 kernel/softirq.c:558
 __do_softirq kernel/softirq.c:592 [inline]
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:641
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:653
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:rmqueue_pcplist mm/page_alloc.c:3711 [inline]
RIP: 0010:rmqueue mm/page_alloc.c:3742 [inline]
RIP: 0010:get_page_from_freelist+0x156c/0x1c60 mm/page_alloc.c:4189
Code: 01 00 00 00 00 00 00 9c 8f 84 24 80 01 00 00 f6 84 24 81 01 00 00 02 0f 85 dc 02 00 00 41 f7 c6 00 02 00 00 74 01 fb 4d 85 e4 <48> b9 00 00 00 00 00 fc ff df 4c 8b 74 24 38 0f 84 b9 01 00 00 4c
RSP: 0018:ffffc90002eaf760 EFLAGS: 00000286
RAX: 98cdf8cd82897f00 RBX: ffffffff8bbae810 RCX: 98cdf8cd82897f00
RDX: dffffc0000000000 RSI: ffffffff8a0b0fc0 RDI: ffffffff8a59a2c0
RBP: ffffc90002eaf970 R08: dffffc0000000000 R09: fffffbfff1ff321f
R10: fffffbfff1ff321f R11: 1ffffffff1ff321e R12: ffffea00009a9cc0
R13: 0000000000000000 R14: 0000000000000202 R15: ffffc90002eaf9c8
 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5466
 vm_area_alloc_pages mm/vmalloc.c:2869 [inline]
 __vmalloc_area_node mm/vmalloc.c:2925 [inline]
 __vmalloc_node_range+0x4b2/0x8b0 mm/vmalloc.c:3030
 vmalloc_user+0x70/0x80 mm/vmalloc.c:3166
 kcov_mmap+0x27/0x120 kernel/kcov.c:474
 call_mmap include/linux/fs.h:2177 [inline]
 mmap_file+0x5d/0xb0 mm/util.c:1092
 __mmap_region mm/mmap.c:1784 [inline]
 mmap_region+0xd0d/0x15e0 mm/mmap.c:2921
 do_mmap+0x77a/0xdf0 mm/mmap.c:1574
 vm_mmap_pgoff+0x1b2/0x2b0 mm/util.c:551
 ksys_mmap_pgoff+0x542/0x780 mm/mmap.c:1623
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f3804c299a3
Code: f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 89 ca 41 f7 c1 ff 0f 00 00 75 14 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 25 c3 0f 1f 40 00 48 c7 c0 a8 ff ff ff 64 c7
RSP: 002b:00007fff88f6f8a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f3804e51038 RCX: 00007f3804c299a3
RDX: 0000000000000003 RSI: 0000000000400000 RDI: 00007f380429a000
RBP: 00007f3804e51038 R08: 00000000000000d8 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000008
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
 </TASK>

Allocated by task 9698:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522
 kmalloc_reserve net/core/skbuff.c:356 [inline]
 __alloc_skb+0x22c/0x750 net/core/skbuff.c:427
 alloc_skb include/linux/skbuff.h:1162 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1183 [inline]
 netlink_sendmsg+0x645/0xbc0 net/netlink/af_netlink.c:1880
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x423/0x580 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __x64_sys_sendto+0xda/0xf0 net/socket.c:2071
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 9698:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1705 [inline]
 slab_free_freelist_hook+0xea/0x170 mm/slub.c:1731
 slab_free mm/slub.c:3499 [inline]
 kfree+0xef/0x2a0 mm/slub.c:4559
 skb_free_head net/core/skbuff.c:655 [inline]
 skb_release_data+0x6fe/0x850 net/core/skbuff.c:677
 skb_release_all net/core/skbuff.c:742 [inline]
 __kfree_skb net/core/skbuff.c:756 [inline]
 consume_skb+0xa2/0x100 net/core/skbuff.c:914
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x784/0x920 net/netlink/af_netlink.c:1337
 netlink_sendmsg+0x8ab/0xbc0 net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x423/0x580 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __x64_sys_sendto+0xda/0xf0 net/socket.c:2071
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Last potentially related work creation:
 kasan_save_stack+0x35/0x60 mm/kasan/common.c:38
 kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
 __call_rcu kernel/rcu/tree.c:3007 [inline]
 call_rcu+0x179/0x920 kernel/rcu/tree.c:3087
 fib6_info_release include/net/ip6_fib.h:339 [inline]
 fib6_del_route net/ipv6/ip6_fib.c:1998 [inline]
 fib6_del+0x10d9/0x1500 net/ipv6/ip6_fib.c:2031
 fib6_clean_node+0x296/0x580 net/ipv6/ip6_fib.c:2193
 fib6_walk_continue+0x640/0x8c0 net/ipv6/ip6_fib.c:2115
 fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2163
 fib6_clean_tree net/ipv6/ip6_fib.c:2243 [inline]
 __fib6_clean_all+0x20e/0x350 net/ipv6/ip6_fib.c:2259
 rt6_sync_down_dev net/ipv6/route.c:4915 [inline]
 rt6_disable_ip+0x11f/0x690 net/ipv6/route.c:4920
 addrconf_ifdown+0x149/0x1970 net/ipv6/addrconf.c:3778
 addrconf_notify+0x445/0xf00 net/ipv6/addrconf.c:-1
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391
 call_netdevice_notifiers_extack net/core/dev.c:2061 [inline]
 call_netdevice_notifiers net/core/dev.c:2075 [inline]
 dev_close_many+0x28d/0x400 net/core/dev.c:1650
 unregister_netdevice_many+0x472/0x18f0 net/core/dev.c:11110
 default_device_exit_batch+0x336/0x390 net/core/dev.c:11667
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x77b/0xb80 net/core/net_namespace.c:635
 process_one_work+0x863/0x1000 kernel/workqueue.c:2310
 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

Second to last potentially related work creation:
 kasan_save_stack+0x35/0x60 mm/kasan/common.c:38
 kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
 __call_rcu kernel/rcu/tree.c:3007 [inline]
 call_rcu+0x179/0x920 kernel/rcu/tree.c:3087
 fib6_info_release include/net/ip6_fib.h:339 [inline]
 __ip6_del_rt+0xf1/0x150 net/ipv6/route.c:3892
 ip6_del_rt+0xb0/0xf0 net/ipv6/route.c:3903
 __ipv6_ifa_notify+0x81a/0xda0 net/ipv6/addrconf.c:6215
 addrconf_ifdown+0xde7/0x1970 net/ipv6/addrconf.c:3902
 addrconf_notify+0x445/0xf00 net/ipv6/addrconf.c:-1
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391
 call_netdevice_notifiers_extack net/core/dev.c:2061 [inline]
 call_netdevice_notifiers net/core/dev.c:2075 [inline]
 dev_close_many+0x28d/0x400 net/core/dev.c:1650
 dev_close+0x14c/0x200 net/core/dev.c:1672
 cfg80211_shutdown_all_interfaces+0xb7/0x1c0 net/wireless/core.c:275
 ieee80211_remove_interfaces+0x167/0x6d0 net/mac80211/iface.c:2142
 ieee80211_unregister_hw+0x55/0x220 net/mac80211/main.c:1399
 mac80211_hwsim_del_radio+0x26d/0x450 drivers/net/wireless/mac80211_hwsim.c:3473
 hwsim_exit_net+0x581/0x640 drivers/net/wireless/mac80211_hwsim.c:4243
 ops_exit_list net/core/net_namespace.c:172 [inline]
 cleanup_net+0x6f0/0xb80 net/core/net_namespace.c:635
 process_one_work+0x863/0x1000 kernel/workqueue.c:2310
 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

The buggy address belongs to the object at ffff88805e838400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 512-byte region [ffff88805e838400, ffff88805e838600)
The buggy address belongs to the page:
page:ffffea00017a0e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88805e83bc00 pfn:0x5e838
head:ffffea00017a0e00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea00017dbf08 ffffea0001e5ed08 ffff888016841c80
raw: ffff88805e83bc00 000000000010000f 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 1230, ts 52897648381, free_ts 52880753706
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192
 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5466
 alloc_slab_page mm/slub.c:1775 [inline]
 allocate_slab mm/slub.c:1912 [inline]
 new_slab+0xc0/0x4b0 mm/slub.c:1975
 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3008
 __slab_alloc mm/slub.c:3095 [inline]
 slab_alloc_node mm/slub.c:3186 [inline]
 slab_alloc mm/slub.c:3228 [inline]
 __kmalloc+0x1cd/0x330 mm/slub.c:4403
 kmalloc include/linux/slab.h:609 [inline]
 kzalloc include/linux/slab.h:735 [inline]
 fib6_info_alloc+0x2e/0xe0 net/ipv6/ip6_fib.c:155
 ip6_route_info_create+0x44f/0x1210 net/ipv6/route.c:3769
 ip6_route_add+0x24/0x130 net/ipv6/route.c:3865
 addrconf_add_mroute net/ipv6/addrconf.c:2511 [inline]
 addrconf_add_dev+0x250/0x350 net/ipv6/addrconf.c:2529
 addrconf_dev_config net/ipv6/addrconf.c:3409 [inline]
 addrconf_init_auto_addrs+0x6a8/0xb50 net/ipv6/addrconf.c:3496
 addrconf_notify+0xa6b/0xf00 net/ipv6/addrconf.c:3665
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391
 netdev_state_change+0xd2/0x140 net/core/dev.c:1440
 linkwatch_do_dev+0x10d/0x160 net/core/link_watch.c:167
 __linkwatch_run_queue+0x4a9/0x7b0 net/core/link_watch.c:213
 linkwatch_event+0x48/0x50 net/core/link_watch.c:252
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
 free_unref_page+0x94/0x280 mm/page_alloc.c:3396
 stack_depot_save+0x418/0x440 lib/stackdepot.c:335
 kasan_save_stack+0x4b/0x60 mm/kasan/common.c:40
 kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
 insert_work+0x54/0x3d0 kernel/workqueue.c:1366
 __queue_work+0x9c5/0xd50 kernel/workqueue.c:1532
 call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451
 expire_timers kernel/time/timer.c:1491 [inline]
 __run_timers+0x550/0x7c0 kernel/time/timer.c:1767
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
 handle_softirqs+0x328/0x820 kernel/softirq.c:558
 do_softirq+0x13b/0x200 kernel/softirq.c:459
 __local_bh_enable_ip+0x174/0x1b0 kernel/softirq.c:383
 spin_unlock_bh include/linux/spinlock.h:408 [inline]
 __ip6_ins_rt net/ipv6/route.c:1306 [inline]
 ip6_route_add+0x90/0x130 net/ipv6/route.c:3869
 addrconf_add_mroute net/ipv6/addrconf.c:2511 [inline]
 addrconf_add_dev+0x250/0x350 net/ipv6/addrconf.c:2529
 addrconf_dev_config net/ipv6/addrconf.c:3409 [inline]
 addrconf_init_auto_addrs+0x6a8/0xb50 net/ipv6/addrconf.c:3496

Memory state around the buggy address:
 ffff88805e838300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805e838380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805e838400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88805e838480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88805e838500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	01 00                	add    %eax,(%rax)
   2:	00 00                	add    %al,(%rax)
   4:	00 00                	add    %al,(%rax)
   6:	00 9c 8f 84 24 80 01 	add    %bl,0x1802484(%rdi,%rcx,4)
   d:	00 00                	add    %al,(%rax)
   f:	f6 84 24 81 01 00 00 	testb  $0x2,0x181(%rsp)
  16:	02
  17:	0f 85 dc 02 00 00    	jne    0x2f9
  1d:	41 f7 c6 00 02 00 00 	test   $0x200,%r14d
  24:	74 01                	je     0x27
  26:	fb                   	sti
  27:	4d 85 e4             	test   %r12,%r12
* 2a:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx <-- trapping instruction
  31:	fc ff df
  34:	4c 8b 74 24 38       	mov    0x38(%rsp),%r14
  39:	0f 84 b9 01 00 00    	je     0x1f8
  3f:	4c                   	rex.WR