==================================================================
BUG: KASAN: use-after-free in rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88805e5ab82a by task syz-executor/4185
CPU: 0 PID: 4185 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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:1648
expire_timers kernel/time/timer.c:1699 [inline]
__run_timers+0x53e/0x800 kernel/time/timer.c:1970
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
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:__sanitizer_cov_trace_const_cmp8+0x7a/0x80 kernel/kcov.c:302
Code: c1 e0 05 4d 8d 50 28 4d 39 ca 77 1e 4a c7 44 02 08 07 00 00 00 4a 89 7c 02 10 4a 89 74 02 18 4a 89 44 02 20 48 ff c1 48 89 0a 0f 1f 44 00 00 48 8b 4e 08 48 83 c1 f8 48 c1 c1 3d 48 83 f9 08
RSP: 0018:ffffc90002f2f698 EFLAGS: 00000293
RAX: ffffffff81ad5b32 RBX: 0000000000000000 RCX: ffff88807bcc1dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002f2f950 R08: ffffea00019284f3 R09: 1ffffd400032509e
R10: dffffc0000000000 R11: fffff9400032509f R12: 00007f4691f47000
R13: 1ffffd4000325099 R14: 00fff0000000000a R15: 0000000000000000
_compound_head include/linux/page-flags.h:198 [inline]
PageSwapBacked include/linux/page-flags.h:371 [inline]
mm_counter_file include/linux/mm.h:1977 [inline]
mm_counter include/linux/mm.h:1986 [inline]
copy_present_pte mm/memory.c:967 [inline]
copy_pte_range mm/memory.c:1081 [inline]
copy_pmd_range mm/memory.c:1167 [inline]
copy_pud_range mm/memory.c:1204 [inline]
copy_p4d_range mm/memory.c:1228 [inline]
copy_page_range+0x1752/0x3230 mm/memory.c:1301
dup_mmap kernel/fork.c:615 [inline]
dup_mm kernel/fork.c:1466 [inline]
copy_mm+0xc86/0x13f0 kernel/fork.c:1518
copy_process+0x17eb/0x3e20 kernel/fork.c:2290
kernel_clone+0x23f/0x990 kernel/fork.c:2679
__do_sys_clone kernel/fork.c:2796 [inline]
__se_sys_clone kernel/fork.c:2780 [inline]
__x64_sys_clone+0x19a/0x210 kernel/fork.c:2780
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: 0033:0x7f46933af292
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffd8c544360 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffd8c544360 RCX: 00007f46933af292
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffd8c5444ec R08: 0000000000000000 R09: 0000000000000001
R10: 000055558a8aa7d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 00000000000830f1 R15: 00007ffd8c544540
Allocated by task 6686:
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
Last potentially related work creation:
kasan_save_stack+0x35/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
kvfree_call_rcu+0x105/0x7d0 kernel/rcu/tree.c:3600
__ipv6_dev_mc_dec+0x2bf/0x320 net/ipv6/mcast.c:981
addrconf_leave_solict net/ipv6/addrconf.c:2213 [inline]
__ipv6_ifa_notify+0x75a/0xe60 net/ipv6/addrconf.c:6201
addrconf_ifdown+0xdff/0x19c0 net/ipv6/addrconf.c:3899
addrconf_notify+0x445/0xf00 net/ipv6/addrconf.c:-1
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:8919
dev_change_flags+0xe3/0x1a0 net/core/dev.c:8955
do_setlink+0xcdb/0x3d60 net/core/rtnetlink.c:2781
rtnl_group_changelink net/core/rtnetlink.c:3298 [inline]
__rtnl_newlink net/core/rtnetlink.c:3462 [inline]
rtnl_newlink+0xf8d/0x1a50 net/core/rtnetlink.c:3574
rtnetlink_rcv_msg+0x844/0xf30 net/core/rtnetlink.c:5684
netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2507
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2445
___sys_sendmsg+0x236/0x2e0 net/socket.c:2499
__sys_sendmsg net/socket.c:2528 [inline]
__do_sys_sendmsg net/socket.c:2537 [inline]
__se_sys_sendmsg+0x1af/0x290 net/socket.c:2535
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 ffff88805e5ab800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
512-byte region [ffff88805e5ab800, ffff88805e5aba00)
The buggy address belongs to the page:
page:ffffea0001796a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88805e5ab800 pfn:0x5e5a8
head:ffffea0001796a00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea000181aa08 ffffea00008fa608 ffff888016c41c80
raw: ffff88805e5ab800 0000000000100003 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 4191, ts 63806372245, free_ts 20123165586
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:5501
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]
__kmalloc+0x1cd/0x330 mm/slub.c:4408
kmalloc include/linux/slab.h:612 [inline]
kzalloc include/linux/slab.h:738 [inline]
fib6_info_alloc+0x2e/0xe0 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x44f/0x1210 net/ipv6/route.c:3769
ip6_route_add+0x24/0x130 net/ipv6/route.c:3865
addrconf_add_mroute net/ipv6/addrconf.c:2510 [inline]
addrconf_add_dev+0x295/0x3c0 net/ipv6/addrconf.c:2528
inet6_addr_add+0x18d/0x9c0 net/ipv6/addrconf.c:2966
inet6_rtm_newaddr+0x64c/0x8f0 net/ipv6/addrconf.c:4951
rtnetlink_rcv_msg+0x844/0xf30 net/core/rtnetlink.c:5684
netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2507
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
__sys_sendto+0x46d/0x620 net/socket.c:2072
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:9428
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:
ffff88805e5ab700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88805e5ab780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805e5ab800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805e5ab880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805e5ab900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: c1 e0 05 shl $0x5,%eax
3: 4d 8d 50 28 lea 0x28(%r8),%r10
7: 4d 39 ca cmp %r9,%r10
a: 77 1e ja 0x2a
c: 4a c7 44 02 08 07 00 movq $0x7,0x8(%rdx,%r8,1)
13: 00 00
15: 4a 89 7c 02 10 mov %rdi,0x10(%rdx,%r8,1)
1a: 4a 89 74 02 18 mov %rsi,0x18(%rdx,%r8,1)
1f: 4a 89 44 02 20 mov %rax,0x20(%rdx,%r8,1)
24: 48 ff c1 inc %rcx
27: 48 89 0a mov %rcx,(%rdx)
* 2a: c3 ret <-- trapping instruction
2b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
30: 48 8b 4e 08 mov 0x8(%rsi),%rcx
34: 48 83 c1 f8 add $0xfffffffffffffff8,%rcx
38: 48 c1 c1 3d rol $0x3d,%rcx
3c: 48 83 f9 08 cmp $0x8,%rcx