================================================================== BUG: KASAN: use-after-free in rose_get_neigh+0x17c/0x480 net/rose/rose_route.c:692 Read of size 1 at addr ffff0000f48f0c30 by task syz.0.1311/7849 CPU: 0 PID: 7849 Comm: syz.0.1311 Not tainted 6.1.142-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x88/0x220 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:427 kasan_report+0xa8/0x100 mm/kasan/report.c:531 __asan_report_load1_noabort+0x2c/0x38 mm/kasan/report_generic.c:348 rose_get_neigh+0x17c/0x480 net/rose/rose_route.c:692 rose_connect+0x364/0xfe8 net/rose/af_rose.c:816 __sys_connect_file net/socket.c:2011 [inline] __sys_connect+0x264/0x28c net/socket.c:2028 __do_sys_connect net/socket.c:2038 [inline] __se_sys_connect net/socket.c:2035 [inline] __arm64_sys_connect+0x7c/0x94 net/socket.c:2035 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 6807: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031 kmalloc include/linux/slab.h:563 [inline] rose_add_node+0x1f4/0xba4 net/rose/rose_route.c:85 rose_rt_ioctl+0xa04/0xde4 net/rose/rose_route.c:747 rose_ioctl+0x378/0xb80 net/rose/af_rose.c:1380 sock_do_ioctl+0xf8/0x240 net/socket.c:1204 sock_ioctl+0x5c4/0x840 net/socket.c:1321 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 call_rcu+0xfc/0x948 kernel/rcu/tree.c:2845 fib6_info_release include/net/ip6_fib.h:340 [inline] fib6_del_route net/ipv6/ip6_fib.c:1999 [inline] fib6_del+0xd54/0x1184 net/ipv6/ip6_fib.c:2032 fib6_clean_node+0x224/0x49c net/ipv6/ip6_fib.c:2194 fib6_walk_continue+0x654/0x878 net/ipv6/ip6_fib.c:2116 fib6_walk+0x140/0x254 net/ipv6/ip6_fib.c:2164 fib6_clean_tree net/ipv6/ip6_fib.c:2244 [inline] __fib6_clean_all+0x1dc/0x310 net/ipv6/ip6_fib.c:2260 fib6_clean_all+0x3c/0x50 net/ipv6/ip6_fib.c:2271 rt6_sync_down_dev net/ipv6/route.c:4944 [inline] rt6_disable_ip+0x104/0x7c8 net/ipv6/route.c:4949 addrconf_ifdown+0x144/0x15dc net/ipv6/addrconf.c:3804 addrconf_notify+0x2f4/0xca8 net/ipv6/addrconf.c:-1 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:2001 [inline] call_netdevice_notifiers_extack net/core/dev.c:2039 [inline] call_netdevice_notifiers net/core/dev.c:2053 [inline] __dev_notify_flags+0x250/0x46c net/core/dev.c:-1 dev_change_flags+0xc8/0x154 net/core/dev.c:8702 do_setlink+0xa24/0x32c4 net/core/rtnetlink.c:2833 rtnl_group_changelink net/core/rtnetlink.c:3361 [inline] __rtnl_newlink net/core/rtnetlink.c:3618 [inline] rtnl_newlink+0xce0/0x1a1c net/core/rtnetlink.c:3655 rtnetlink_rcv_msg+0x734/0xce4 net/core/rtnetlink.c:6153 netlink_rcv_skb+0x208/0x3c4 net/netlink/af_netlink.c:2493 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6171 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x600/0x818 net/netlink/af_netlink.c:1337 netlink_sendmsg+0x6e8/0x9b0 net/netlink/af_netlink.c:1859 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5b8/0x918 net/socket.c:2519 ___sys_sendmsg net/socket.c:2573 [inline] __sys_sendmsg+0x25c/0x320 net/socket.c:2602 __do_sys_sendmsg net/socket.c:2611 [inline] __se_sys_sendmsg net/socket.c:2609 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2609 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the object at ffff0000f48f0c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 48 bytes inside of 512-byte region [ffff0000f48f0c00, ffff0000f48f0e00) The buggy address belongs to the physical page: page:000000000c5ffbec refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000f48f3c00 pfn:0x1348f0 head:000000000c5ffbec order:2 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0003ce7508 fffffc0003558b08 ffff0000c0002600 raw: ffff0000f48f3c00 0000000000100001 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f48f0b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f48f0b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000f48f0c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f48f0c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f48f0d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ------------[ cut here ]------------ ODEBUG: assert_init not available (active state 0) object type: timer_list hint: 0x0 WARNING: CPU: 0 PID: 7849 at lib/debugobjects.c:518 debug_print_object+0x148/0x1d4 lib/debugobjects.c:515 Modules linked in: CPU: 0 PID: 7849 Comm: syz.0.1311 Tainted: G B 6.1.142-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : debug_print_object+0x148/0x1d4 lib/debugobjects.c:515 lr : debug_print_object+0x148/0x1d4 lib/debugobjects.c:515 sp : ffff8000213177e0 x29: ffff8000213177e0 x28: dfff800000000000 x27: 0000000000000000 x26: ffff800015080000 x25: ffff8000083ae078 x24: dfff800000000000 x23: 0000000000000000 x22: 0000000000000000 x21: ffff800011f7a300 x20: ffff800011aaad00 x19: ffff800011f79e40 x18: ffff800011a8bce0 x17: 1fffe00033ee0b7e x16: ffff800008042c60 x15: 0000000040000002 x14: 0000000000000002 x13: 0000000000ff0100 x12: 0000000000ff0100 x11: ff00800008047eec x10: 0000000040000002 x9 : 8c3d5870cd566c00 x8 : 8c3d5870cd566c00 x7 : 0000000000000004 x6 : ffff800008251edc x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff800021317380 x1 : 0000000000000000 x0 : ffff800008251f70 Call trace: debug_print_object+0x148/0x1d4 lib/debugobjects.c:515 debug_object_assert_init+0x250/0x2c8 lib/debugobjects.c:900 debug_timer_assert_init kernel/time/timer.c:792 [inline] debug_assert_init kernel/time/timer.c:837 [inline] timer_delete+0x48/0x1e8 kernel/time/timer.c:1277 del_timer include/linux/timer.h:211 [inline] rose_start_t0timer net/rose/rose_link.c:46 [inline] rose_transmit_link+0x43c/0x66c net/rose/rose_link.c:286 rose_write_internal+0xeec/0x17c0 net/rose/rose_subr.c:198 rose_connect+0x8bc/0xfe8 net/rose/af_rose.c:879 __sys_connect_file net/socket.c:2011 [inline] __sys_connect+0x264/0x28c net/socket.c:2028 __do_sys_connect net/socket.c:2038 [inline] __se_sys_connect net/socket.c:2035 [inline] __arm64_sys_connect+0x7c/0x94 net/socket.c:2035 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 352 hardirqs last enabled at (352): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline] hardirqs last enabled at (352): [] exit_to_kernel_mode+0xcc/0xfc arch/arm64/kernel/entry-common.c:94 hardirqs last disabled at (351): [] __el1_irq arch/arm64/kernel/entry-common.c:468 [inline] hardirqs last disabled at (351): [] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:486 softirqs last enabled at (340): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (340): [] lock_sock_nested+0xe0/0x130 net/core/sock.c:3495 softirqs last disabled at (342): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (342): [] rose_get_neigh+0x60/0x480 net/rose/rose_route.c:688 ---[ end trace 0000000000000000 ]---