==================================================================
BUG: KASAN: use-after-free in rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
Read of size 2 at addr ffff8880300c842a by task syz.4.471/6084
CPU: 0 PID: 6084 Comm: syz.4.471 Not tainted 6.1.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
print_address_description mm/kasan/report.c:316 [inline]
print_report+0xa8/0x200 mm/kasan/report.c:418
kasan_report+0x10b/0x140 mm/kasan/report.c:522
rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
expire_timers kernel/time/timer.c:1549 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1820
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:raw_spin_rq_unlock_irq+0x13/0x90 kernel/sched/sched.h:1368
Code: 7c d2 e8 30 21 77 00 eb cb 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 66 90 41 57 41 56 53 eb 11 e8 94 76 c6 08 e8 7f 60 2d 00 fb 5b <41> 5e 41 5f c3 49 be 00 00 00 00 00 fc ff df 49 89 ff 48 8d 9f 58
RSP: 0018:ffffc900058374e8 EFLAGS: 00000282
RAX: af551716cccd0500 RBX: ffff8880b8e3b7f8 RCX: af551716cccd0500
RDX: dffffc0000000000 RSI: ffffffff8a8c0460 RDI: ffffffff8adef320
RBP: ffffc90005837690 R08: dffffc0000000000 R09: ffffed10171c7551
R10: ffffed10171c7551 R11: 1ffff110171c7550 R12: ffff888055bd3b80
R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff8880b8e3b7c8
__schedule+0x137c/0x40b0 kernel/sched/core.c:6567
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_call_function_single+0x16/0x20 arch/x86/include/asm/idtentry.h:699
RIP: 0010:lock_is_held_type+0x7/0x190 kernel/locking/lockdep.c:5690
Code: c7 c7 00 03 8c 8a 48 c7 c6 40 03 8c 8a e8 d1 c4 36 f7 0f 0b eb bf e8 98 fd ff ff 0f 1f 84 00 00 00 00 00 55 41 57 41 56 41 55 <41> 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 bd
RSP: 0018:ffffc90005837810 EFLAGS: 00000202
RAX: 1ffffffff1966001 RBX: ffff888078e38000 RCX: af551716cccd0500
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8cb2ae20
RBP: 0000000000000cc0 R08: dffffc0000000000 R09: fffffbfff215ba49
R10: fffffbfff215ba49 R11: 1ffffffff215ba48 R12: 0000000000000000
R13: 00000000000000f0 R14: ffff8880317b1b80 R15: dffffc0000000000
__get_obj_cgroup_from_memcg+0x5f/0xe0 mm/memcontrol.c:3003
get_obj_cgroup_from_current+0x16b/0x280 mm/memcontrol.c:3024
memcg_slab_pre_alloc_hook mm/slab.h:485 [inline]
slab_pre_alloc_hook+0x91/0x310 mm/slab.h:715
slab_alloc_node mm/slub.c:3318 [inline]
slab_alloc mm/slub.c:3406 [inline]
__kmem_cache_alloc_lru mm/slub.c:3413 [inline]
kmem_cache_alloc+0x56/0x2f0 mm/slub.c:3422
alloc_pid+0x9d/0xc10 kernel/pid.c:180
copy_process+0x1bb5/0x4020 kernel/fork.c:2367
kernel_clone+0x225/0x8b0 kernel/fork.c:2757
__do_sys_clone3 kernel/fork.c:3056 [inline]
__se_sys_clone3+0x2dc/0x360 kernel/fork.c:3040
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb2031c3449
Code: d7 08 00 48 8d 3d 5c d7 08 00 e8 02 29 f6 ff 66 90 b8 ea ff ff ff 48 85 ff 74 2c 48 85 d2 74 27 49 89 c8 b8 b3 01 00 00 0f 05 <48> 85 c0 7c 18 74 01 c3 31 ed 48 83 e4 f0 4c 89 c7 ff d2 48 89 c7
RSP: 002b:00007ffdf14abf58 EFLAGS: 00000206 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 00007fb203145850 RCX: 00007fb2031c3449
RDX: 00007fb203145850 RSI: 0000000000000058 RDI: 00007ffdf14abfa0
RBP: 00007fb203fe96c0 R08: 00007fb203fe96c0 R09: 00007ffdf14ac087
R10: 0000000000000008 R11: 0000000000000206 R12: ffffffffffffffa8
R13: 000000000000006e R14: 00007ffdf14abfa0 R15: 00007ffdf14ac088
Allocated by task 4443:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:383
kmalloc include/linux/slab.h:563 [inline]
rose_add_node+0x227/0xdb0 net/rose/rose_route.c:85
rose_rt_ioctl+0xa4c/0xe90 net/rose/rose_route.c:740
rose_ioctl+0x27a/0x790 net/rose/af_rose.c:1380
sock_do_ioctl+0xd3/0x2f0 net/socket.c:1204
sock_ioctl+0x4ed/0x6e0 net/socket.c:1321
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Freed by task 6051:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1750
slab_free mm/slub.c:3661 [inline]
__kmem_cache_free+0xb6/0x1f0 mm/slub.c:3674
rose_rt_device_down+0x4e2/0x530 net/rose/rose_route.c:515
rose_device_event+0x600/0x690 net/rose/af_rose.c:248
notifier_call_chain kernel/notifier.c:87 [inline]
raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455
call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
call_netdevice_notifiers net/core/dev.c:2053 [inline]
dev_close_many+0x28d/0x400 net/core/dev.c:1601
dev_close+0x14c/0x200 net/core/dev.c:1623
bpq_device_event+0x2f0/0x8b0 drivers/net/hamradio/bpqether.c:547
notifier_call_chain kernel/notifier.c:87 [inline]
raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455
call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
call_netdevice_notifiers net/core/dev.c:2053 [inline]
__dev_notify_flags+0x178/0x2d0 net/core/dev.c:-1
dev_change_flags+0xe3/0x1a0 net/core/dev.c:8702
dev_ifsioc+0x159/0xe90 net/core/dev_ioctl.c:327
dev_ioctl+0x578/0xea0 net/core/dev_ioctl.c:588
sock_do_ioctl+0x222/0x2f0 net/socket.c:1218
sock_ioctl+0x4ed/0x6e0 net/socket.c:1321
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
The buggy address belongs to the object at ffff8880300c8400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
512-byte region [ffff8880300c8400, ffff8880300c8600)
The buggy address belongs to the physical page:
page:ffffea0000c03200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880300c9000 pfn:0x300c8
head:ffffea0000c03200 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea00015b8c08 ffffea0000a8bb08 ffff888017441c80
raw: ffff8880300c9000 0000000000100009 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 3156, tgid 3156 (kworker/u4:1), ts 20105889027, free_ts 0
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532
prep_new_page mm/page_alloc.c:2539 [inline]
get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328
__alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614
alloc_slab_page+0x5d/0x160 mm/slub.c:1794
allocate_slab mm/slub.c:1939 [inline]
new_slab+0x87/0x2c0 mm/slub.c:1992
___slab_alloc+0xbc6/0x1220 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
__kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3437
kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026
kmalloc include/linux/slab.h:563 [inline]
kzalloc include/linux/slab.h:699 [inline]
alloc_bprm+0x56/0x730 fs/exec.c:1537
kernel_execve+0x94/0x9c0 fs/exec.c:2004
call_usermodehelper_exec_async+0x207/0x350 kernel/umh.c:113
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
page_owner free stack trace missing
Memory state around the buggy address:
ffff8880300c8300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880300c8380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880300c8400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880300c8480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880300c8500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 7c d2 jl 0xffffffd4
2: e8 30 21 77 00 call 0x772137
7: eb cb jmp 0xffffffd4
9: 0f 0b ud2
b: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
12: 00 00 00
15: 66 90 xchg %ax,%ax
17: 41 57 push %r15
19: 41 56 push %r14
1b: 53 push %rbx
1c: eb 11 jmp 0x2f
1e: e8 94 76 c6 08 call 0x8c676b7
23: e8 7f 60 2d 00 call 0x2d60a7
28: fb sti
29: 5b pop %rbx
* 2a: 41 5e pop %r14 <-- trapping instruction
2c: 41 5f pop %r15
2e: c3 ret
2f: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14
36: fc ff df
39: 49 89 ff mov %rdi,%r15
3c: 48 rex.W
3d: 8d .byte 0x8d
3e: 9f lahf
3f: 58 pop %rax