================================================================== BUG: KASAN: slab-use-after-free in cleanup_bearer+0x1b0/0x298 net/tipc/udp_media.c:820 Read of size 8 at addr ffff0000db765a18 by task kworker/0:1/10 CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted 6.13.0-rc2-syzkaller-g2e7aff49b5da #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events cleanup_bearer Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x198/0x538 mm/kasan/report.c:489 kasan_report+0xd8/0x138 mm/kasan/report.c:602 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 cleanup_bearer+0x1b0/0x298 net/tipc/udp_media.c:820 process_one_work+0x7a8/0x15cc kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3391 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Allocated by task 7649: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:568 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4104 [inline] slab_alloc_node mm/slub.c:4153 [inline] kmem_cache_alloc_lru_noprof+0x258/0x414 mm/slub.c:4172 sock_alloc_inode+0x2c/0xcc net/socket.c:307 alloc_inode+0x68/0x19c fs/inode.c:336 new_inode_pseudo+0x20/0x30 fs/inode.c:1174 sock_alloc net/socket.c:615 [inline] __sock_create+0x134/0x908 net/socket.c:1522 sock_create_kern+0x4c/0x64 net/socket.c:1634 udp_sock_create4+0xd4/0x5a4 net/ipv4/udp_tunnel_core.c:18 udp_sock_create+0x94/0xc0 include/net/udp_tunnel.h:59 tipc_udp_enable+0xb60/0x1298 net/tipc/udp_media.c:770 tipc_enable_bearer net/tipc/bearer.c:331 [inline] __tipc_nl_bearer_enable+0x960/0xf94 net/tipc/bearer.c:1047 tipc_nl_bearer_enable+0x2c/0x48 net/tipc/bearer.c:1056 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x888/0xbb0 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2542 genl_rcv+0x38/0x50 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x668/0x8a4 net/netlink/af_netlink.c:1347 netlink_sendmsg+0x7a4/0xa8c net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] ____sys_sendmsg+0x56c/0x840 net/socket.c:2583 ___sys_sendmsg net/socket.c:2637 [inline] __sys_sendmsg+0x238/0x304 net/socket.c:2669 __do_sys_sendmsg net/socket.c:2674 [inline] __se_sys_sendmsg net/socket.c:2672 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2672 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Freed by task 8627: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x64/0x8c mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2338 [inline] slab_free mm/slub.c:4598 [inline] kmem_cache_free+0x198/0x554 mm/slub.c:4700 sock_free_inode+0x28/0x38 net/socket.c:328 i_callback+0x50/0x78 fs/inode.c:325 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0x898/0x1b5c kernel/rcu/tree.c:2823 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2840 handle_softirqs+0x320/0xd34 kernel/softirq.c:554 __do_softirq+0x14/0x20 kernel/softirq.c:588 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 __kasan_record_aux_stack+0xb8/0xd0 mm/kasan/generic.c:544 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:554 __call_rcu_common kernel/rcu/tree.c:3086 [inline] call_rcu+0x104/0xb00 kernel/rcu/tree.c:3190 destroy_inode fs/inode.c:391 [inline] evict+0x7b4/0x978 fs/inode.c:827 iput_final fs/inode.c:1946 [inline] iput+0x740/0x8e8 fs/inode.c:1972 __sock_release net/socket.c:652 [inline] sock_release+0x110/0x140 net/socket.c:668 udp_tunnel_sock_release+0x74/0x88 net/ipv4/udp_tunnel_core.c:182 cleanup_bearer+0x180/0x298 net/tipc/udp_media.c:818 process_one_work+0x7a8/0x15cc kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3391 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 The buggy address belongs to the object at ffff0000db765a00 which belongs to the cache sock_inode_cache of size 1408 The buggy address is located 24 bytes inside of freed 1408-byte region [ffff0000db765a00, ffff0000db765f80) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000db766000 pfn:0x11b760 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff0000d6480f01 flags: 0x5ffc00000000240(workingset|head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000240 ffff0000c1be5c80 fffffdffc3749e10 fffffdffc36dd210 raw: ffff0000db766000 0000000000150009 00000001f5000000 ffff0000d6480f01 head: 05ffc00000000240 ffff0000c1be5c80 fffffdffc3749e10 fffffdffc36dd210 head: ffff0000db766000 0000000000150009 00000001f5000000 ffff0000d6480f01 head: 05ffc00000000003 fffffdffc36dd801 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000db765900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000db765980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000db765a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000db765a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000db765b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Unable to handle kernel paging request at virtual address dfff800000000006 KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000006] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Tainted: G B 6.13.0-rc2-syzkaller-g2e7aff49b5da #0 Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events cleanup_bearer pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : read_pnet include/net/net_namespace.h:392 [inline] pc : sock_net include/net/sock.h:655 [inline] pc : cleanup_bearer+0x1c0/0x298 net/tipc/udp_media.c:820 lr : read_pnet include/net/net_namespace.h:392 [inline] lr : sock_net include/net/sock.h:655 [inline] lr : cleanup_bearer+0x1bc/0x298 net/tipc/udp_media.c:820 sp : ffff800097a27aa0 x29: ffff800097a27aa0 x28: ffff80008f97d600 x27: 1fffe0001833c3ca x26: ffff0000c1080008 x25: ffff0000c19e2244 x24: dfff800000000000 x23: ffff0000c19e1e40 x22: ffff0000d6486318 x21: 1fffe0001ac90c61 x20: 0000000000000030 x19: ffff0000d6486318 x18: 0000000000000008 x17: 0000000000000000 x16: ffff80008326d65c x15: 0000000000000001 x14: 1ffff000125cfaf0 x13: 0000000000000000 x12: 0000000000000000 x11: ffff7000125cfaf1 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000006 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800097a270d8 x4 : ffff80008fa6f860 x3 : ffff8000802f42d0 x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: read_pnet include/net/net_namespace.h:392 [inline] (P) sock_net include/net/sock.h:655 [inline] (P) cleanup_bearer+0x1c0/0x298 net/tipc/udp_media.c:820 (P) read_pnet include/net/net_namespace.h:392 [inline] (L) sock_net include/net/sock.h:655 [inline] (L) cleanup_bearer+0x1bc/0x298 net/tipc/udp_media.c:820 (L) process_one_work+0x7a8/0x15cc kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3391 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Code: f9400288 9100c114 9414cacf d343fe88 (38786908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: f9400288 ldr x8, [x20] 4: 9100c114 add x20, x8, #0x30 8: 9414cacf bl 0x532b44 c: d343fe88 lsr x8, x20, #3 * 10: 38786908 ldrb w8, [x8, x24] <-- trapping instruction