================================================================== BUG: KASAN: use-after-free in rose_get_neigh+0x17c/0x480 net/rose/rose_route.c:690 Read of size 1 at addr ffff0000cd4fac30 by task syz.0.625/6247 CPU: 0 PID: 6247 Comm: syz.0.625 Not tainted 5.15.182-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x78/0x30c mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xec/0x15c mm/kasan/report.c:451 __asan_report_load1_noabort+0x44/0x50 mm/kasan/report_generic.c:306 rose_get_neigh+0x17c/0x480 net/rose/rose_route.c:690 rose_connect+0x350/0xffc net/rose/af_rose.c:814 __sys_connect_file net/socket.c:1923 [inline] __sys_connect+0x264/0x28c net/socket.c:1940 __do_sys_connect net/socket.c:1950 [inline] __se_sys_connect net/socket.c:1947 [inline] __arm64_sys_connect+0x7c/0x94 net/socket.c:1947 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Allocated by task 6204: 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+0xb0/0xf0 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc_node_track_caller+0x234/0x3bc mm/slub.c:4963 kmalloc_reserve+0xe4/0x26c net/core/skbuff.c:356 __alloc_skb+0x23c/0x67c net/core/skbuff.c:427 alloc_skb include/linux/skbuff.h:1162 [inline] tipc_tlv_alloc net/tipc/netlink_compat.c:156 [inline] tipc_nl_compat_doit+0x378/0x534 net/tipc/netlink_compat.c:402 tipc_nl_compat_handle net/tipc/netlink_compat.c:-1 [inline] tipc_nl_compat_recv+0x66c/0x940 net/tipc/netlink_compat.c:1325 genl_family_rcv_msg_doit net/netlink/genetlink.c:731 [inline] genl_family_rcv_msg net/netlink/genetlink.c:775 [inline] genl_rcv_msg+0x8b4/0xb6c net/netlink/genetlink.c:792 netlink_rcv_skb+0x208/0x3c4 net/netlink/af_netlink.c:2489 genl_rcv+0x38/0x50 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x60c/0x89c net/netlink/af_netlink.c:1337 netlink_sendmsg+0x6e8/0x9cc net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x61c/0x920 net/socket.c:2436 ___sys_sendmsg+0x1d0/0x240 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg net/socket.c:2526 [inline] __arm64_sys_sendmsg+0x1a8/0x254 net/socket.c:2526 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Freed by task 6203: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x84 mm/kasan/common.c:46 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0x128/0x1e8 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kfree+0x170/0x40c mm/slub.c:4559 skb_free_head net/core/skbuff.c:655 [inline] skb_release_data+0x3c0/0x5ac net/core/skbuff.c:677 skb_release_all net/core/skbuff.c:742 [inline] __kfree_skb net/core/skbuff.c:756 [inline] kfree_skb_reason+0x1d0/0x41c net/core/skbuff.c:776 kfree_skb include/linux/skbuff.h:1118 [inline] skb_queue_purge+0x120/0x1a0 net/core/skbuff.c:3324 netlink_sock_destruct+0x2c/0x16c net/netlink/af_netlink.c:396 __sk_destruct+0x5c/0x604 net/core/sock.c:1956 sk_destruct net/core/sock.c:2001 [inline] __sk_free+0x320/0x430 net/core/sock.c:2012 sk_free+0x68/0xdc net/core/sock.c:2023 deferred_put_nlk_sk+0xa4/0x118 net/netlink/af_netlink.c:722 rcu_do_batch kernel/rcu/tree.c:2523 [inline] rcu_core+0x7c8/0x1764 kernel/rcu/tree.c:2763 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2776 handle_softirqs+0x344/0xbf0 kernel/softirq.c:558 __do_softirq kernel/softirq.c:592 [inline] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] invoke_softirq kernel/softirq.c:439 [inline] __irq_exit_rcu+0x240/0x440 kernel/softirq.c:641 irq_exit+0x14/0x88 kernel/softirq.c:665 handle_domain_irq+0x14c/0x1fc kernel/irq/irqdesc.c:711 gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:765 Last potentially related work creation: kasan_save_stack+0x38/0x68 mm/kasan/common.c:38 kasan_record_aux_stack+0xcc/0x114 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3007 [inline] call_rcu+0x110/0x8f0 kernel/rcu/tree.c:3087 fib6_info_release include/net/ip6_fib.h:339 [inline] ip6_route_add+0xec/0x16c net/ipv6/route.c:3870 addrconf_prefix_route net/ipv6/addrconf.c:2447 [inline] add_v4_addrs+0x768/0xaac net/ipv6/addrconf.c:3197 addrconf_gre_config net/ipv6/addrconf.c:3470 [inline] addrconf_init_auto_addrs+0x1d0/0x9c0 net/ipv6/addrconf.c:3488 addrconf_notify+0x884/0xc6c net/ipv6/addrconf.c:3665 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2049 [inline] call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] __dev_notify_flags+0x250/0x46c net/core/dev.c:-1 dev_change_flags+0xc8/0x154 net/core/dev.c:8929 do_setlink+0xa20/0x3088 net/core/rtnetlink.c:2779 __rtnl_newlink net/core/rtnetlink.c:3450 [inline] rtnl_newlink+0x10d0/0x1404 net/core/rtnetlink.c:3572 rtnetlink_rcv_msg+0x9d4/0xd04 net/core/rtnetlink.c:5650 netlink_rcv_skb+0x208/0x3c4 net/netlink/af_netlink.c:2489 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:5668 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x60c/0x89c net/netlink/af_netlink.c:1337 netlink_sendmsg+0x6e8/0x9cc net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] __sys_sendto+0x2e8/0x3d8 net/socket.c:2063 __do_sys_sendto net/socket.c:2075 [inline] __se_sys_sendto net/socket.c:2071 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 The buggy address belongs to the object at ffff0000cd4fac00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 48 bytes inside of 512-byte region [ffff0000cd4fac00, ffff0000cd4fae00) The buggy address belongs to the page: page:000000001727cc28 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000cd4fa400 pfn:0x10d4f8 head:000000001727cc28 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0003353d08 fffffc00032a4208 ffff0000c0002600 raw: ffff0000cd4fa400 000000000010000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000cd4fab00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000cd4fab80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000cd4fac00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000cd4fac80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000cd4fad00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================