==================================================================
BUG: KASAN: use-after-free in rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88805fee182a by task syz.4.1078/7496
CPU: 0 PID: 7496 Comm: syz.4.1078 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
dump_stack_lvl+0x188/0x250 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+0x17b/0x540 kernel/time/timer.c:1451
expire_timers kernel/time/timer.c:1496 [inline]
__run_timers+0x53a/0x7f0 kernel/time/timer.c:1767
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
handle_softirqs+0x339/0x830 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
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
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:console_unlock+0xcad/0x1120 kernel/printk/printk.c:2749
Code: 75 11 e8 c6 d8 18 00 4d 85 ff 75 16 e8 bc d8 18 00 eb 15 e8 b5 d8 18 00 e8 b0 d0 5b 08 4d 85 ff 74 ea e8 a6 d8 18 00 fb 31 ff <89> de e8 fc db 18 00 85 db 0f 94 c0 22 44 24 17 3c 01 75 1f e8 8a
RSP: 0018:ffffc9000333eda0 EFLAGS: 00000246
RAX: ffffffff8160482a RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000e5fb000 RSI: 0000000000002472 RDI: 0000000000000000
RBP: ffffc9000333f010 R08: ffffffff901d20c7 R09: 1ffffffff203a418
R10: dffffc0000000000 R11: fffffbfff203a419 R12: 1ffffffff198d6ad
R13: 0000000000000064 R14: 0000000000000000 R15: 0000000000000200
vprintk_emit+0xc0/0x150 kernel/printk/printk.c:2274
_printk+0xda/0x130 kernel/printk/printk.c:2299
__nla_validate_parse+0x1f6a/0x2780 lib/nlattr.c:603
__nla_parse+0x3c/0x50 lib/nlattr.c:688
__nlmsg_parse include/net/netlink.h:733 [inline]
nlmsg_parse_deprecated include/net/netlink.h:772 [inline]
rtnl_valid_dump_ifinfo_req net/core/rtnetlink.c:2104 [inline]
rtnl_dump_ifinfo+0x40e/0x1470 net/core/rtnetlink.c:2129
netlink_dump+0x694/0xcf0 net/netlink/af_netlink.c:2283
netlink_recvmsg+0x672/0xe20 net/netlink/af_netlink.c:2001
____sys_recvmsg+0x2cd/0x5e0 net/socket.c:-1
___sys_recvmsg+0x21a/0x5c0 net/socket.c:2706
__sys_recvmsg net/socket.c:2736 [inline]
__do_sys_recvmsg net/socket.c:2746 [inline]
__se_sys_recvmsg net/socket.c:2743 [inline]
__x64_sys_recvmsg+0x1f9/0x2c0 net/socket.c:2743
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: 0033:0x7f2b3b2bfeb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2b3951b028 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007f2b3b53afa0 RCX: 00007f2b3b2bfeb9
RDX: 0000000040000100 RSI: 0000200000000040 RDI: 0000000000000003
RBP: 00007f2b3b32dc1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2b3b53b038 R14: 00007f2b3b53afa0 R15: 00007ffce7a47198
Allocated by task 4463:
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 include/linux/slab.h:607 [inline]
rose_add_node+0x227/0xdb0 net/rose/rose_route.c:85
rose_rt_ioctl+0xa2b/0xe70 net/rose/rose_route.c:738
rose_ioctl+0x2a7/0x7d0 net/rose/af_rose.c:1372
sock_do_ioctl+0xfb/0x320 net/socket.c:1147
sock_ioctl+0x4d2/0x710 net/socket.c:1266
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
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 7189:
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:1710 [inline]
slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736
slab_free mm/slub.c:3504 [inline]
kfree+0xef/0x2a0 mm/slub.c:4564
rose_rt_device_down+0x4e2/0x530 net/rose/rose_route.c:515
rose_device_event+0x606/0x6c0 net/rose/af_rose.c:247
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:2074 [inline]
call_netdevice_notifiers net/core/dev.c:2088 [inline]
__dev_notify_flags+0x158/0x300 net/core/dev.c:8906
dev_change_flags+0xe3/0x1a0 net/core/dev.c:8942
dev_ifsioc+0x130/0xd50 net/core/dev_ioctl.c:324
dev_ioctl+0x545/0xe30 net/core/dev_ioctl.c:572
sock_do_ioctl+0x245/0x320 net/socket.c:1161
sock_ioctl+0x4d2/0x710 net/socket.c:1266
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
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
The buggy address belongs to the object at ffff88805fee1800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
512-byte region [ffff88805fee1800, ffff88805fee1a00)
The buggy address belongs to the page:
page:ffffea00017fb800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5fee0
head:ffffea00017fb800 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888016c41c80
raw: 0000000000000000 0000000000100010 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 23, ts 60572299848, free_ts 17046033020
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x1bbd/0x1ca0 mm/page_alloc.c:4192
__alloc_pages+0x1ee/0x480 mm/page_alloc.c:5487
alloc_slab_page mm/slub.c:1780 [inline]
allocate_slab mm/slub.c:1917 [inline]
new_slab+0xc0/0x4b0 mm/slub.c:1980
___slab_alloc+0x80a/0xdd0 mm/slub.c:3013
__slab_alloc mm/slub.c:3100 [inline]
slab_alloc_node mm/slub.c:3191 [inline]
slab_alloc mm/slub.c:3233 [inline]
kmem_cache_alloc_trace+0x1a5/0x2a0 mm/slub.c:3250
kmalloc include/linux/slab.h:607 [inline]
kzalloc include/linux/slab.h:738 [inline]
mca_alloc net/ipv6/mcast.c:880 [inline]
__ipv6_dev_mc_inc+0x3fa/0xa90 net/ipv6/mcast.c:935
addrconf_join_solict net/ipv6/addrconf.c:2201 [inline]
addrconf_dad_begin net/ipv6/addrconf.c:4016 [inline]
addrconf_dad_work+0x3d1/0x1540 net/ipv6/addrconf.c:4143
process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
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+0x8f/0x2a0 mm/page_alloc.c:3396
free_contig_range+0x96/0xf0 mm/page_alloc.c:9414
destroy_args+0xf0/0xa00 mm/debug_vm_pgtable.c:1018
debug_vm_pgtable+0x321/0x380 mm/debug_vm_pgtable.c:1336
do_one_initcall+0x272/0x730 init/main.c:1316
do_initcall_level+0x137/0x1f0 init/main.c:1389
do_initcalls+0x4b/0x90 init/main.c:1405
kernel_init_freeable+0x3e9/0x570 init/main.c:1629
kernel_init+0x19/0x1b0 init/main.c:1520
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Memory state around the buggy address:
ffff88805fee1700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88805fee1780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805fee1800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805fee1880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805fee1900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 75 11 jne 0x13
2: e8 c6 d8 18 00 call 0x18d8cd
7: 4d 85 ff test %r15,%r15
a: 75 16 jne 0x22
c: e8 bc d8 18 00 call 0x18d8cd
11: eb 15 jmp 0x28
13: e8 b5 d8 18 00 call 0x18d8cd
18: e8 b0 d0 5b 08 call 0x85bd0cd
1d: 4d 85 ff test %r15,%r15
20: 74 ea je 0xc
22: e8 a6 d8 18 00 call 0x18d8cd
27: fb sti
28: 31 ff xor %edi,%edi
* 2a: 89 de mov %ebx,%esi <-- trapping instruction
2c: e8 fc db 18 00 call 0x18dc2d
31: 85 db test %ebx,%ebx
33: 0f 94 c0 sete %al
36: 22 44 24 17 and 0x17(%rsp),%al
3a: 3c 01 cmp $0x1,%al
3c: 75 1f jne 0x5d
3e: e8 .byte 0xe8
3f: 8a .byte 0x8a