================================================================== BUG: KASAN: slab-out-of-bounds in rose_link_up net/rose/rose_link.c:124 [inline] BUG: KASAN: slab-out-of-bounds in rose_transmit_link+0xe8/0x740 net/rose/rose_link.c:271 Read of size 8 at addr ffff88805e248fa0 by task syz.4.4958/24840 CPU: 0 PID: 24840 Comm: syz.4.4958 Not tainted 6.6.96-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xac/0x230 mm/kasan/report.c:475 kasan_report+0x117/0x150 mm/kasan/report.c:588 rose_link_up net/rose/rose_link.c:124 [inline] rose_transmit_link+0xe8/0x740 net/rose/rose_link.c:271 rose_write_internal+0x11d1/0x1ab0 net/rose/rose_subr.c:198 rose_connect+0x8ee/0x10a0 net/rose/af_rose.c:879 __sys_connect_file net/socket.c:2057 [inline] __sys_connect+0x397/0x420 net/socket.c:2074 __do_sys_connect net/socket.c:2084 [inline] __se_sys_connect net/socket.c:2081 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2081 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f25ab58e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f25ac448038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f25ab7b5fa0 RCX: 00007f25ab58e929 RDX: 0000000000000040 RSI: 0000200000000100 RDI: 000000000000000b RBP: 00007f25ab610b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f25ab7b5fa0 R15: 00007ffcda59e2b8 Allocated by task 11092: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc+0xb4/0x240 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] kzalloc include/linux/slab.h:721 [inline] fib6_info_alloc+0x32/0xe0 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x44f/0x1200 net/ipv6/route.c:3793 ip6_route_add+0x28/0x130 net/ipv6/route.c:3889 addrconf_prefix_route net/ipv6/addrconf.c:2451 [inline] addrconf_add_linklocal+0x45c/0x6b0 net/ipv6/addrconf.c:3287 addrconf_addr_gen+0x4ac/0x5a0 net/ipv6/addrconf.c:3416 addrconf_init_auto_addrs+0x719/0xb40 net/ipv6/addrconf.c:-1 addrconf_notify+0xb62/0x1010 net/ipv6/addrconf.c:3718 notifier_call_chain+0x197/0x390 kernel/notifier.c:93 netdev_state_change+0xd6/0x150 net/core/dev.c:1408 linkwatch_do_dev+0x10d/0x160 net/core/link_watch.c:191 __linkwatch_run_queue+0x40f/0x660 net/core/link_watch.c:244 linkwatch_event+0x4c/0x60 net/core/link_watch.c:287 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492 kvfree_call_rcu+0xee/0x780 kernel/rcu/tree.c:3448 ipv6_mc_destroy_dev+0x3c1/0x590 net/ipv6/mcast.c:2815 addrconf_ifdown+0x139f/0x1880 net/ipv6/addrconf.c:3974 addrconf_notify+0x6c6/0x1010 net/ipv6/addrconf.c:-1 notifier_call_chain+0x197/0x390 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2064 [inline] call_netdevice_notifiers net/core/dev.c:2078 [inline] unregister_netdevice_many_notify+0xf36/0x1810 net/core/dev.c:11074 ip6gre_exit_batch_net+0x449/0x490 net/ipv6/ip6_gre.c:1647 ops_exit_list net/core/net_namespace.c:178 [inline] cleanup_net+0x77f/0xb90 net/core/net_namespace.c:652 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Second to last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492 insert_work+0x3d/0x310 kernel/workqueue.c:1651 __queue_work+0xd2c/0x1020 kernel/workqueue.c:1804 call_timer_fn+0x16e/0x530 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1746 [inline] __run_timers+0x558/0x7d0 kernel/time/timer.c:2022 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035 handle_softirqs+0x280/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 The buggy address belongs to the object at ffff88805e248c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 656 bytes to the right of allocated 272-byte region [ffff88805e248c00, ffff88805e248d10) The buggy address belongs to the physical page: page:ffffea0001789200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5e248 head:ffffea0001789200 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888017841c80 ffffea000169d100 dead000000000002 raw: 0000000000000000 0000000000100010 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 5791, tgid 5791 (syz-executor), ts 87291562966, free_ts 87283759355 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554 prep_new_page mm/page_alloc.c:1561 [inline] get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457 alloc_slab_page+0x5d/0x170 mm/slub.c:1876 allocate_slab mm/slub.c:2023 [inline] new_slab+0x87/0x2e0 mm/slub.c:2076 ___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230 __slab_alloc mm/slub.c:3329 [inline] __slab_alloc_node mm/slub.c:3382 [inline] slab_alloc_node mm/slub.c:3475 [inline] __kmem_cache_alloc_node+0x1a2/0x260 mm/slub.c:3524 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] mca_alloc net/ipv6/mcast.c:880 [inline] __ipv6_dev_mc_inc+0x413/0xac0 net/ipv6/mcast.c:936 ipv6_add_dev+0xd66/0x11f0 net/ipv6/addrconf.c:463 ipv6_find_idev+0xbd/0x1d0 net/ipv6/addrconf.c:489 inet6_rtm_newaddr+0x490/0x940 net/ipv6/addrconf.c:4990 rtnetlink_rcv_msg+0x7c7/0xf10 net/core/rtnetlink.c:6475 netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2537 netlink_unicast_kernel net/netlink/af_netlink.c:1323 [inline] netlink_unicast+0x750/0x8c0 net/netlink/af_netlink.c:1349 netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1891 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1154 [inline] free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429 __stack_depot_save+0x572/0x630 lib/stackdepot.c:443 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x5f/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767 slab_alloc_node mm/slub.c:3485 [inline] slab_alloc mm/slub.c:3493 [inline] __kmem_cache_alloc_lru mm/slub.c:3500 [inline] kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3509 kmem_cache_zalloc include/linux/slab.h:711 [inline] fill_pool lib/debugobjects.c:169 [inline] debug_objects_fill_pool+0x48f/0x6b0 lib/debugobjects.c:616 debug_object_assert_init+0x66/0x2f0 lib/debugobjects.c:894 debug_timer_assert_init kernel/time/timer.c:792 [inline] debug_assert_init kernel/time/timer.c:837 [inline] __timer_delete+0x3f/0x290 kernel/time/timer.c:1321 del_timer include/linux/timer.h:213 [inline] try_to_grab_pending+0x107/0x850 kernel/workqueue.c:1568 mod_delayed_work_on+0x90/0x1a0 kernel/workqueue.c:2021 mod_delayed_work include/linux/workqueue.h:592 [inline] addrconf_mod_dad_work+0x76/0x120 net/ipv6/addrconf.c:331 addrconf_dad_start net/ipv6/addrconf.c:4146 [inline] addrconf_add_linklocal+0x4e6/0x6b0 net/ipv6/addrconf.c:3289 addrconf_addr_gen+0x4ac/0x5a0 net/ipv6/addrconf.c:3416 addrconf_init_auto_addrs+0x719/0xb40 net/ipv6/addrconf.c:-1 Memory state around the buggy address: ffff88805e248e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805e248f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805e248f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88805e249000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805e249080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================