==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88807bb6ac2a by task syz.4.2468/15026
CPU: 1 UID: 0 PID: 15026 Comm: syz.4.2468 Not tainted 6.15.0-rc4-syzkaller-00147-gebd297a2affa #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
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:folios_put_refs+0x125/0x640 mm/swap.c:948
Code: 64 24 18 4d 8d 77 ff bf 1f 00 00 00 4c 89 f6 e8 41 ee c4 ff 49 83 fe 1e 0f 87 2e 03 00 00 e8 52 e9 c4 ff 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ef e8 3d de 26 00 4c 89 6c 24 10 4f 8b 2c
RSP: 0018:ffffc90003f77620 EFLAGS: 00000a06
RAX: 1ffff920007eef0f RBX: dffffc0000000000 RCX: ffff888051b5bc00
RDX: 0000000000000000 RSI: 000000000000001e RDI: 000000000000001f
RBP: ffffc90003f77710 R08: ffffea0001b14a37 R09: 1ffffd4000362946
R10: dffffc0000000000 R11: fffff94000362947 R12: ffffc90003f77780
R13: ffffc90003f77878 R14: 000000000000001e R15: 000000000000001f
free_pages_and_swap_cache+0x277/0x520 mm/swap_state.c:267
__tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
tlb_flush_mmu+0x3a0/0x680 mm/mmu_gather.c:404
tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:496
exit_mmap+0x474/0xba0 mm/mmap.c:1297
__mmput+0x118/0x420 kernel/fork.c:1379
exit_mm+0x1da/0x2c0 kernel/exit.c:589
do_exit+0x859/0x2550 kernel/exit.c:940
do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111
x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232
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: 0033:0x7f4eecf8e969
Code: Unable to access opcode bytes at 0x7f4eecf8e93f.
RSP: 002b:00007ffdc798aad8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4eecf8e969
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffdc798ab3c R08: 0000001bc798abcf R09: 00000000000927c0
R10: 00000000000001dc R11: 0000000000000246 R12: 00000000000002b6
R13: 00000000000927c0 R14: 000000000005d8f7 R15: 00007ffdc798ab90
Allocated by task 9404:
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:4372
kmalloc_noprof include/linux/slab.h:905 [inline]
rose_add_node+0x23a/0xde0 net/rose/rose_route.c:85
rose_rt_ioctl+0xa48/0xfb0 net/rose/rose_route.c:747
rose_ioctl+0x3ce/0x8b0 net/rose/af_rose.c:1380
sock_do_ioctl+0xd9/0x300 net/socket.c:1190
sock_ioctl+0x576/0x790 net/socket.c:1311
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
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 14985:
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:2398 [inline]
slab_free mm/slub.c:4656 [inline]
kfree+0x193/0x440 mm/slub.c:4855
rose_rt_device_down+0x66d/0x6c0 net/rose/rose_route.c:522
rose_device_event+0x603/0x6a0 net/rose/af_rose.c:248
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
__dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1
netif_change_flags+0xe8/0x1a0 net/core/dev.c:9434
dev_change_flags+0x130/0x260 net/core/dev_api.c:68
dev_ioctl+0x7b4/0x1150 net/core/dev_ioctl.c:821
sock_do_ioctl+0x22c/0x300 net/socket.c:1204
sock_ioctl+0x576/0x790 net/socket.c:1311
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
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
The buggy address belongs to the object at ffff88807bb6ac00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
freed 512-byte region [ffff88807bb6ac00, ffff88807bb6ae00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88807bb68400 pfn:0x7bb68
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801a041c80 ffffea0001fcaa10 ffffea000093ca10
raw: ffff88807bb68400 000000000010000a 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801a041c80 ffffea0001fcaa10 ffffea000093ca10
head: ffff88807bb68400 000000000010000a 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0001eeda01 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 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 5878, tgid 5878 (udevd), ts 145773741679, free_ts 142931788022
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1718
prep_new_page mm/page_alloc.c:1726 [inline]
get_page_from_freelist+0x21ce/0x22b0 mm/page_alloc.c:3688
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4970
alloc_slab_page mm/slub.c:2470 [inline]
allocate_slab+0x65/0x3b0 mm/slub.c:2632
new_slab mm/slub.c:2686 [inline]
___slab_alloc+0xbfc/0x1480 mm/slub.c:3872
__slab_alloc mm/slub.c:3962 [inline]
__slab_alloc_node mm/slub.c:4037 [inline]
slab_alloc_node mm/slub.c:4198 [inline]
__do_kmalloc_node mm/slub.c:4340 [inline]
__kmalloc_node_noprof+0x2fd/0x4e0 mm/slub.c:4347
kmalloc_array_node_noprof include/linux/slab.h:1020 [inline]
alloc_slab_obj_exts mm/slub.c:1992 [inline]
account_slab mm/slub.c:2595 [inline]
allocate_slab+0x17c/0x3b0 mm/slub.c:2651
new_slab mm/slub.c:2686 [inline]
___slab_alloc+0xbfc/0x1480 mm/slub.c:3872
__slab_alloc mm/slub.c:3962 [inline]
__slab_alloc_node mm/slub.c:4037 [inline]
slab_alloc_node mm/slub.c:4198 [inline]
kmem_cache_alloc_noprof+0x283/0x3c0 mm/slub.c:4217
sigqueue_alloc kernel/signal.c:455 [inline]
__send_signal_locked+0x22a/0xeb0 kernel/signal.c:1087
do_send_sig_info kernel/signal.c:1269 [inline]
group_send_sig_info+0x1fd/0x260 kernel/signal.c:1419
do_bpf_send_signal+0xa9/0x1e0 kernel/trace/bpf_trace.c:815
irq_work_single+0xde/0x240 kernel/irq_work.c:221
irq_work_run_list kernel/irq_work.c:252 [inline]
irq_work_run+0x155/0x2f0 kernel/irq_work.c:261
__sysvec_irq_work+0xa8/0x3d0 arch/x86/kernel/irq_work.c:22
instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
sysvec_irq_work+0x9e/0xc0 arch/x86/kernel/irq_work.c:17
page last free pid 6041 tgid 6041 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0xb0e/0xcd0 mm/page_alloc.c:2725
__slab_free+0x326/0x400 mm/slub.c:4567
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:4161 [inline]
slab_alloc_node mm/slub.c:4210 [inline]
kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4217
getname_flags+0xb8/0x540 fs/namei.c:146
getname include/linux/fs.h:2852 [inline]
getname_maybe_null include/linux/fs.h:2859 [inline]
vfs_fstatat+0x43/0x160 fs/stat.c:367
__do_sys_newfstatat fs/stat.c:536 [inline]
__se_sys_newfstatat fs/stat.c:530 [inline]
__x64_sys_newfstatat+0x11c/0x1a0 fs/stat.c:530
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
Memory state around the buggy address:
ffff88807bb6ab00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88807bb6ab80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807bb6ac00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807bb6ac80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807bb6ad00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 64 24 18 fs and $0x18,%al
3: 4d 8d 77 ff lea -0x1(%r15),%r14
7: bf 1f 00 00 00 mov $0x1f,%edi
c: 4c 89 f6 mov %r14,%rsi
f: e8 41 ee c4 ff call 0xffc4ee55
14: 49 83 fe 1e cmp $0x1e,%r14
18: 0f 87 2e 03 00 00 ja 0x34c
1e: e8 52 e9 c4 ff call 0xffc4e975
23: 4c 89 e8 mov %r13,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction
2e: 74 08 je 0x38
30: 4c 89 ef mov %r13,%rdi
33: e8 3d de 26 00 call 0x26de75
38: 4c 89 6c 24 10 mov %r13,0x10(%rsp)
3d: 4f rex.WRXB
3e: 8b .byte 0x8b
3f: 2c .byte 0x2c