==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88807c11042a by task modprobe/14649
CPU: 1 UID: 0 PID: 14649 Comm: modprobe Not tainted 6.15.0-rc4-syzkaller-00213-g3c44b2d615e6 #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:arch_static_branch arch/x86/include/asm/jump_label.h:36 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:208 [inline]
RIP: 0010:perf_sw_event include/linux/perf_event.h:1536 [inline]
RIP: 0010:do_user_addr_fault+0x1ae/0x1390 arch/x86/mm/fault.c:1284
Code: 1b 48 89 de 48 81 e6 00 02 00 00 31 ff e8 3a 56 4d 00 48 81 e3 00 02 00 00 0f 84 79 0e 00 00 e8 a8 ce 54 00 fb 4c 89 7c 24 38 <0f> 1f 44 00 00 e8 38 51 4d 00 44 89 f6 83 e6 40 31 ff 48 89 74 24
RSP: 0000:ffffc9000b9f7e68 EFLAGS: 00000286
RAX: 1c42141daec35800 RBX: 0000000000000200 RCX: 1c42141daec35800
RDX: 0000000000000000 RSI: ffffffff8d749fba RDI: ffffffff8bc1cde0
RBP: dffffc0000000000 R08: ffffffff8f7eca77 R09: 1ffffffff1efd94e
R10: dffffc0000000000 R11: fffffbfff1efd94f R12: ffffc9000b9f7f58
R13: 00007f355191d35d R14: 0000000000000014 R15: ffff8880609dda00
handle_page_fault arch/x86/mm/fault.c:1480 [inline]
exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f355191d35d
Code: Unable to access opcode bytes at 0x7f355191d333.
RSP: 002b:00007ffee9b349b8 EFLAGS: 00010202
RAX: 00007ffee9b34af0 RBX: 00007ffee9b34ac8 RCX: 000000000000002d
RDX: 0000000000000000 RSI: 00007ffee9b34ac8 RDI: 0000000000000004
RBP: 0000000000000004 R08: 0000000000000000 R09: 00007f35519c4a60
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffee9b34af0 R14: 00007f35519f5000 R15: 0000558810ce9d98
Allocated by task 6137:
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 14606:
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:9422
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 ffff88807c110400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
freed 512-byte region [ffff88807c110400, ffff88807c110600)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7c110
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a041c80 ffffea0000c80f00 dead000000000002
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801a041c80 ffffea0000c80f00 dead000000000002
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0001f04401 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5847, tgid 5847 (syz-executor), ts 91028450672, free_ts 90993307634
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_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2468 [inline]
allocate_slab+0x8a/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_noprof+0x305/0x4f0 mm/slub.c:4353
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+0x4b3/0x1360 net/ipv6/route.c:3802
addrconf_f6i_alloc+0x1c6/0x3f0 net/ipv6/route.c:4631
ipv6_add_addr+0x56e/0x1090 net/ipv6/addrconf.c:1121
add_addr+0x8b/0x2d0 net/ipv6/addrconf.c:3200
add_v4_addrs+0x70c/0xbd0 net/ipv6/addrconf.c:3262
addrconf_gre_config net/ipv6/addrconf.c:3545 [inline]
addrconf_init_auto_addrs+0x765/0xb50 net/ipv6/addrconf.c:3563
addrconf_notify+0xacc/0x1010 net/ipv6/addrconf.c:3744
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
page last free pid 5831 tgid 5831 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_node_noprof+0x1bb/0x3c0 mm/slub.c:4262
__alloc_skb+0x112/0x2d0 net/core/skbuff.c:658
alloc_skb include/linux/skbuff.h:1340 [inline]
nlmsg_new include/net/netlink.h:1019 [inline]
netlink_ack+0x146/0xa50 net/netlink/af_netlink.c:2471
netlink_rcv_skb+0x2a0/0x490 net/netlink/af_netlink.c:2540
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
Memory state around the buggy address:
ffff88807c110300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88807c110380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807c110400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807c110480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807c110500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 48 89 de mov %rbx,%rsi
3: 48 81 e6 00 02 00 00 and $0x200,%rsi
a: 31 ff xor %edi,%edi
c: e8 3a 56 4d 00 call 0x4d564b
11: 48 81 e3 00 02 00 00 and $0x200,%rbx
18: 0f 84 79 0e 00 00 je 0xe97
1e: e8 a8 ce 54 00 call 0x54cecb
23: fb sti
24: 4c 89 7c 24 38 mov %r15,0x38(%rsp)
* 29: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction
2e: e8 38 51 4d 00 call 0x4d516b
33: 44 89 f6 mov %r14d,%esi
36: 83 e6 40 and $0x40,%esi
39: 31 ff xor %edi,%edi
3b: 48 rex.W
3c: 89 .byte 0x89
3d: 74 24 je 0x63