==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x46a/0x4b0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88802b40402a by task syz.8.5043/22161
CPU: 0 PID: 22161 Comm: syz.8.5043 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xac/0x220 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
rose_timer_expiry+0x46a/0x4b0 net/rose/rose_timer.c:183
call_timer_fn+0x16e/0x530 kernel/time/timer.c:1700
expire_timers kernel/time/timer.c:1751 [inline]
__run_timers+0x52d/0x7d0 kernel/time/timer.c:2022
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:finish_task_switch+0x26a/0x920 kernel/sched/core.c:5254
Code: 0f 84 37 01 00 00 48 85 db 0f 85 56 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 20 54 1b 09 e8 ab a6 2f 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90003727ab8 EFLAGS: 00000286
RAX: 2fd90dc68949b400 RBX: 0000000000000000 RCX: 2fd90dc68949b400
RDX: dffffc0000000000 RSI: ffffffff8aaaba20 RDI: ffffffff8afc7040
RBP: ffffc90003727b10 R08: ffffffff8e4a8f2f R09: 1ffffffff1c951e5
R10: dffffc0000000000 R11: fffffbfff1c951e6 R12: ffff88804e4d0000
R13: dffffc0000000000 R14: ffff888023b35a00 R15: ffff8880b8e3cf08
context_switch kernel/sched/core.c:5383 [inline]
__schedule+0x14da/0x44d0 kernel/sched/core.c:6699
schedule+0xbd/0x170 kernel/sched/core.c:6773
do_msgrcv+0xa4b/0x1350 ipc/msg.c:1198
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc62618ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc626fcc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000046
RAX: ffffffffffffffda RBX: 00007fc6263b6180 RCX: 00007fc62618ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc626211e19 R08: 0000000000003000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc6263b6218 R14: 00007fc6263b6180 R15: 00007fffff7d74e8
Allocated by task 1082:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
mld_add_delrec net/ipv6/mcast.c:742 [inline]
igmp6_leave_group net/ipv6/mcast.c:2628 [inline]
igmp6_group_dropped+0x37c/0xd20 net/ipv6/mcast.c:722
__ipv6_dev_mc_dec+0x2b3/0x330 net/ipv6/mcast.c:977
addrconf_leave_solict net/ipv6/addrconf.c:2217 [inline]
__ipv6_ifa_notify+0x434/0xaa0 net/ipv6/addrconf.c:6262
addrconf_ifdown+0xe6a/0x1880 net/ipv6/addrconf.c:3949
addrconf_notify+0x6c6/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x197/0x390 kernel/notifier.c:93
call_netdevice_notifiers_extack net/core/dev.c:2064 [inline]
call_netdevice_notifiers net/core/dev.c:2078 [inline]
dev_close_many+0x297/0x400 net/core/dev.c:1619
unregister_netdevice_many_notify+0x4c1/0x1810 net/core/dev.c:11059
unregister_netdevice_many net/core/dev.c:11142 [inline]
default_device_exit_batch+0x9cb/0xa60 net/core/dev.c:11620
ops_exit_list net/core/net_namespace.c:178 [inline]
cleanup_net+0x77f/0xb90 net/core/net_namespace.c:652
process_one_work kernel/workqueue.c:2634 [inline]
process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
kvfree_call_rcu+0xee/0x780 kernel/rcu/tree.c:3452
mld_clear_delrec+0x193/0x5d0 net/ipv6/mcast.c:824
ipv6_mc_destroy_dev+0x45/0x590 net/ipv6/mcast.c:2794
addrconf_ifdown+0x139f/0x1880 net/ipv6/addrconf.c:3968
addrconf_notify+0x6c6/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x197/0x390 kernel/notifier.c:93
call_netdevice_notifiers_extack net/core/dev.c:2064 [inline]
call_netdevice_notifiers net/core/dev.c:2078 [inline]
unregister_netdevice_many_notify+0xf36/0x1810 net/core/dev.c:11086
unregister_netdevice_many net/core/dev.c:11142 [inline]
default_device_exit_batch+0x9cb/0xa60 net/core/dev.c:11620
ops_exit_list net/core/net_namespace.c:178 [inline]
cleanup_net+0x77f/0xb90 net/core/net_namespace.c:652
process_one_work kernel/workqueue.c:2634 [inline]
process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Second to last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
kvfree_call_rcu+0xee/0x780 kernel/rcu/tree.c:3452
drop_sysctl_table+0x356/0x4b0 fs/proc/proc_sysctl.c:1515
drop_sysctl_table+0x36d/0x4b0 fs/proc/proc_sysctl.c:1518
unregister_sysctl_table+0x41/0x60 fs/proc/proc_sysctl.c:1536
__devinet_sysctl_unregister net/ipv4/devinet.c:2657 [inline]
devinet_sysctl_unregister net/ipv4/devinet.c:2685 [inline]
inetdev_destroy net/ipv4/devinet.c:330 [inline]
inetdev_event+0x760/0x15c0 net/ipv4/devinet.c:1637
notifier_call_chain+0x197/0x390 kernel/notifier.c:93
call_netdevice_notifiers_extack net/core/dev.c:2064 [inline]
call_netdevice_notifiers net/core/dev.c:2078 [inline]
unregister_netdevice_many_notify+0xf36/0x1810 net/core/dev.c:11086
unregister_netdevice_many net/core/dev.c:11142 [inline]
default_device_exit_batch+0x9cb/0xa60 net/core/dev.c:11620
ops_exit_list net/core/net_namespace.c:178 [inline]
cleanup_net+0x77f/0xb90 net/core/net_namespace.c:652
process_one_work kernel/workqueue.c:2634 [inline]
process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
The buggy address belongs to the object at ffff88802b404000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
freed 512-byte region [ffff88802b404000, ffff88802b404200)
The buggy address belongs to the physical page:
page:ffffea0000ad0100 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802b404000 pfn:0x2b404
head:ffffea0000ad0100 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888017841c80 ffffea0001776410 ffffea000093e910
raw: ffff88802b404000 000000000010000c 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 13677262132, free_ts 0
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
prep_new_page mm/page_alloc.c:1561 [inline]
get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
__alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
alloc_page_interleave+0x24/0x1e0 mm/mempolicy.c:2120
alloc_slab_page+0x5d/0x170 mm/slub.c:1876
allocate_slab mm/slub.c:2023 [inline]
new_slab+0x87/0x2e0 mm/slub.c:2076
___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230
__slab_alloc mm/slub.c:3329 [inline]
__slab_alloc_node mm/slub.c:3382 [inline]
slab_alloc_node mm/slub.c:3475 [inline]
__kmem_cache_alloc_node+0x1a2/0x260 mm/slub.c:3524
kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
device_private_init drivers/base/core.c:3528 [inline]
device_add+0xbe/0xc20 drivers/base/core.c:3579
__video_register_device+0x3964/0x4890 drivers/media/v4l2-core/v4l2-dev.c:1043
video_register_device include/media/v4l2-dev.h:383 [inline]
vivid_create_devnodes+0xd4f/0x2cd0 drivers/media/test-drivers/vivid/vivid-core.c:1430
vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:1951 [inline]
vivid_probe+0x4868/0x5ce0 drivers/media/test-drivers/vivid/vivid-core.c:2004
platform_probe+0x13b/0x1c0 drivers/base/platform.c:1404
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x25b/0xb40 drivers/base/dd.c:658
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:800
page_owner free stack trace missing
Memory state around the buggy address:
ffff88802b403f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88802b403f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88802b404000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802b404080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802b404100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 0f 84 37 01 00 00 je 0x13d
6: 48 85 db test %rbx,%rbx
9: 0f 85 56 01 00 00 jne 0x165
f: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
14: 4c 8b 75 d0 mov -0x30(%rbp),%r14
18: 4c 89 e7 mov %r12,%rdi
1b: e8 20 54 1b 09 call 0x91b5440
20: e8 ab a6 2f 00 call 0x2fa6d0
25: fb sti
26: 4c 8b 65 c0 mov -0x40(%rbp),%r12
* 2a: 49 8d bc 24 f8 15 00 lea 0x15f8(%r12),%rdi <-- trapping instruction
31: 00
32: 48 89 f8 mov %rdi,%rax
35: 48 c1 e8 03 shr $0x3,%rax
39: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax
3e: 84 c0 test %al,%al