==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88806c5aec2a by task syz-executor/15972
CPU: 1 UID: 0 PID: 15972 Comm: syz-executor Not tainted 6.15.0-rc5-syzkaller-01021-g0b28182c73a3 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xb4/0x290 mm/kasan/report.c:521
kasan_report+0x118/0x150 mm/kasan/report.c:634
rose_timer_expiry+0x471/0x4b0 net/rose/rose_timer.c:183
call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1789
expire_timers kernel/time/timer.c:1840 [inline]
__run_timers kernel/time/timer.c:2414 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2426
run_timer_base kernel/time/timer.c:2435 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2445
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 cb a2 6d f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 f3 24 37 f6 65 8b 05 5c 55 1c 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc9000b476d40 EFLAGS: 00000206
RAX: 65fc28f79f338100 RBX: 0000000000000a02 RCX: 65fc28f79f338100
RDX: 0000000000000006 RSI: ffffffff8d7517fa RDI: 0000000000000001
RBP: ffffc9000b476dd0 R08: ffffffff8f7f2d77 R09: 1ffffffff1efe5ae
R10: dffffc0000000000 R11: fffffbfff1efe5af R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff99a8d038 R15: 1ffff9200168eda8
debug_timer_init kernel/time/timer.c:830 [inline]
debug_init kernel/time/timer.c:878 [inline]
init_timer_key+0x41/0x2d0 kernel/time/timer.c:922
ipv6_mc_init_dev+0x31c/0xa60 net/ipv6/mcast.c:2820
ipv6_add_dev+0xccc/0x1370 net/ipv6/addrconf.c:455
addrconf_notify+0x794/0x1010 net/ipv6/addrconf.c:3654
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2266 [inline]
call_netdevice_notifiers net/core/dev.c:2280 [inline]
register_netdevice+0x1608/0x1ae0 net/core/dev.c:11090
ipvlan_link_new+0x407/0xa90 drivers/net/ipvlan/ipvlan_main.c:592
rtnl_newlink_create+0x30d/0xb00 net/core/rtnetlink.c:3834
__rtnl_newlink net/core/rtnetlink.c:3951 [inline]
rtnl_newlink+0x16d6/0x1c70 net/core/rtnetlink.c:4066
rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6955
netlink_rcv_skb+0x219/0x490 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg+0x219/0x270 net/socket.c:727
__sys_sendto+0x3bd/0x520 net/socket.c:2180
__do_sys_sendto net/socket.c:2187 [inline]
__se_sys_sendto net/socket.c:2183 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2183
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1dbf9907fc
Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b
RSP: 002b:00007ffce98a3b80 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f1dc06e4620 RCX: 00007f1dbf9907fc
RDX: 0000000000000058 RSI: 00007f1dc06e4670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffce98a3bd4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f1dc06e4670 R15: 0000000000000000
Allocated by task 15577:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4358
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
genradix_alloc_node include/linux/generic-radix-tree.h:101 [inline]
__genradix_ptr_alloc+0x352/0x4a0 lib/generic-radix-tree.c:69
__genradix_prealloc+0x44/0x90 lib/generic-radix-tree.c:216
sctp_stream_alloc_out net/sctp/stream.c:104 [inline]
sctp_stream_init+0x14b/0x440 net/sctp/stream.c:149
sctp_association_init net/sctp/associola.c:232 [inline]
sctp_association_new+0x10dd/0x25f0 net/sctp/associola.c:296
sctp_connect_new_asoc+0x2c5/0x690 net/sctp/socket.c:1092
sctp_sendmsg_new_asoc net/sctp/socket.c:1694 [inline]
sctp_sendmsg+0x155c/0x2810 net/sctp/socket.c:2005
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg+0x19c/0x270 net/socket.c:727
__sys_sendto+0x3bd/0x520 net/socket.c:2180
__do_sys_sendto net/socket.c:2187 [inline]
__se_sys_sendto net/socket.c:2183 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2183
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 15577:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x62/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2380 [inline]
slab_free mm/slub.c:4642 [inline]
kfree+0x193/0x440 mm/slub.c:4841
genradix_free_recurse+0x5d/0xa0 lib/generic-radix-tree.c:204
genradix_free_recurse+0x5d/0xa0 lib/generic-radix-tree.c:204
sctp_stream_free+0xd5/0x110 net/sctp/stream.c:191
sctp_association_free+0x26d/0x7f0 net/sctp/associola.c:351
sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:944 [inline]
sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1330 [inline]
sctp_side_effects net/sctp/sm_sideeffect.c:1198 [inline]
sctp_do_sm+0x3eba/0x5a20 net/sctp/sm_sideeffect.c:1169
sctp_primitive_SHUTDOWN+0x98/0xc0 net/sctp/primitive.c:89
sctp_close+0x409/0x900 net/sctp/socket.c:1529
inet_release+0x184/0x210 net/ipv4/af_inet.c:435
__sock_release net/socket.c:647 [inline]
sock_close+0xc0/0x240 net/socket.c:1391
__fput+0x449/0xa70 fs/file_table.c:465
task_work_run+0x1d1/0x260 kernel/task_work.c:227
get_signal+0x11c5/0x1310 kernel/signal.c:2807
arch_do_signal_or_restart+0x95/0x780 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x8b/0x120 kernel/entry/common.c:218
do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88806c5aec00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
freed 512-byte region [ffff88806c5aec00, ffff88806c5aee00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6c5ac
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a041c80 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801a041c80 0000000000000000 dead000000000001
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0001b16b01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 976, tgid 976 (kworker/1:2), ts 82586527730, free_ts 82419738990
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1714
prep_new_page mm/page_alloc.c:1722 [inline]
get_page_from_freelist+0x21e0/0x22c0 mm/page_alloc.c:3684
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4966
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab+0x8a/0x3b0 mm/slub.c:2618
new_slab mm/slub.c:2672 [inline]
___slab_alloc+0xbfc/0x1480 mm/slub.c:3858
__slab_alloc mm/slub.c:3948 [inline]
__slab_alloc_node mm/slub.c:4023 [inline]
slab_alloc_node mm/slub.c:4184 [inline]
__kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4353
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
br_multicast_new_port_group+0x3c1/0xbb0 net/bridge/br_multicast.c:1419
__br_multicast_add_group+0x60d/0xa30 net/bridge/br_multicast.c:1538
br_multicast_add_group net/bridge/br_multicast.c:1569 [inline]
br_ip6_multicast_add_group net/bridge/br_multicast.c:1621 [inline]
br_ip6_multicast_mld2_report net/bridge/br_multicast.c:3037 [inline]
br_multicast_ipv6_rcv net/bridge/br_multicast.c:3975 [inline]
br_multicast_rcv+0x3a5f/0x74b0 net/bridge/br_multicast.c:4033
br_handle_frame_finish+0x78a/0x19b0 net/bridge/br_input.c:156
br_nf_hook_thresh+0x3bf/0x490 net/bridge/br_netfilter_hooks.c:-1
br_nf_pre_routing_finish_ipv6+0x948/0xd00 net/bridge/br_netfilter_ipv6.c:-1
NF_HOOK include/linux/netfilter.h:314 [inline]
br_nf_pre_routing_ipv6+0x37e/0x6b0 net/bridge/br_netfilter_ipv6.c:184
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:283 [inline]
br_handle_frame+0x97f/0x14c0 net/bridge/br_input.c:434
__netif_receive_skb_core+0x10de/0x4180 net/core/dev.c:5827
page last free pid 12 tgid 12 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1258 [inline]
__free_frozen_pages+0xb14/0xce0 mm/page_alloc.c:2721
__slab_free+0x326/0x400 mm/slub.c:4553
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4147 [inline]
slab_alloc_node mm/slub.c:4196 [inline]
__do_kmalloc_node mm/slub.c:4326 [inline]
__kmalloc_noprof+0x224/0x4f0 mm/slub.c:4339
kmalloc_noprof include/linux/slab.h:909 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
fib6_info_alloc+0x30/0xf0 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x147/0xa70 net/ipv6/route.c:3782
ip6_route_add+0x29/0x2f0 net/ipv6/route.c:3909
addrconf_add_mroute net/ipv6/addrconf.c:2551 [inline]
addrconf_add_dev+0x24f/0x340 net/ipv6/addrconf.c:2569
addrconf_dev_config net/ipv6/addrconf.c:3477 [inline]
addrconf_init_auto_addrs+0x5cf/0xb50 net/ipv6/addrconf.c:3571
addrconf_notify+0xacc/0x1010 net/ipv6/addrconf.c:3744
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
netif_state_change+0x284/0x3a0 net/core/dev.c:1582
linkwatch_do_dev+0x117/0x170 net/core/link_watch.c:186
__linkwatch_run_queue+0x56d/0x7e0 net/core/link_watch.c:244
Memory state around the buggy address:
ffff88806c5aeb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88806c5aeb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88806c5aec00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88806c5aec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88806c5aed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 74 05 je 0x7
2: e8 cb a2 6d f6 call 0xf66da2d2
7: 48 c7 44 24 20 00 00 movq $0x0,0x20(%rsp)
e: 00 00
10: 9c pushf
11: 8f 44 24 20 pop 0x20(%rsp)
15: f6 44 24 21 02 testb $0x2,0x21(%rsp)
1a: 75 4f jne 0x6b
1c: f7 c3 00 02 00 00 test $0x200,%ebx
22: 74 01 je 0x25
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 f3 24 37 f6 call 0xf6372522 <-- trapping instruction
2f: 65 8b 05 5c 55 1c 07 mov %gs:0x71c555c(%rip),%eax # 0x71c5592
36: 85 c0 test %eax,%eax
38: 74 40 je 0x7a
3a: 48 rex.W
3b: c7 .byte 0xc7
3c: 04 24 add $0x24,%al
3e: 0e (bad)
3f: 36 ss