================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:185 [inline] BUG: KASAN: use-after-free in dev_queue_xmit_nit+0x7b5/0x950 net/core/dev.c:1925 Read of size 8 at addr ffff88809b489430 by task syz-executor.3/11509 CPU: 0 PID: 11509 Comm: syz-executor.3 Not tainted 4.14.289-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 __read_once_size include/linux/compiler.h:185 [inline] dev_queue_xmit_nit+0x7b5/0x950 net/core/dev.c:1925 xmit_one net/core/dev.c:3001 [inline] dev_hard_start_xmit+0xaa/0x890 net/core/dev.c:3021 sch_direct_xmit+0x251/0x500 net/sched/sch_generic.c:186 __dev_xmit_skb net/core/dev.c:3214 [inline] __dev_queue_xmit+0x1ab0/0x2480 net/core/dev.c:3489 neigh_hh_output include/net/neighbour.h:490 [inline] neigh_output include/net/neighbour.h:498 [inline] ip_finish_output2+0x9db/0x1340 net/ipv4/ip_output.c:237 ip_finish_output+0x37c/0xc50 net/ipv4/ip_output.c:325 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip_output+0x1cd/0x510 net/ipv4/ip_output.c:413 dst_output include/net/dst.h:470 [inline] ip_local_out+0x93/0x170 net/ipv4/ip_output.c:125 ip_queue_xmit+0x82b/0x1b40 net/ipv4/ip_output.c:513 __tcp_transmit_skb+0x17da/0x2ca0 net/ipv4/tcp_output.c:1134 __tcp_send_ack.part.0+0x399/0x580 net/ipv4/tcp_output.c:3653 __tcp_send_ack net/ipv4/tcp_output.c:3659 [inline] tcp_send_ack+0x6f/0x90 net/ipv4/tcp_output.c:3659 __tcp_ack_snd_check+0xf6/0x380 net/ipv4/tcp_input.c:5169 tcp_rcv_established+0x13dd/0x1a50 net/ipv4/tcp_input.c:5561 tcp_v4_do_rcv+0x541/0x7d0 net/ipv4/tcp_ipv4.c:1487 tcp_v4_rcv+0x275c/0x3560 net/ipv4/tcp_ipv4.c:1761 ip_local_deliver_finish+0x3f2/0xab0 net/ipv4/ip_input.c:216 NF_HOOK include/linux/netfilter.h:250 [inline] ip_local_deliver+0x167/0x460 net/ipv4/ip_input.c:257 dst_input include/net/dst.h:476 [inline] ip_rcv_finish+0x6e3/0x19f0 net/ipv4/ip_input.c:396 NF_HOOK include/linux/netfilter.h:250 [inline] ip_rcv+0x8a7/0xf10 net/ipv4/ip_input.c:493 __netif_receive_skb_core+0x15ee/0x2a30 net/core/dev.c:4474 __netif_receive_skb+0x27/0x1a0 net/core/dev.c:4512 netif_receive_skb_internal+0xd7/0x580 net/core/dev.c:4585 napi_skb_finish net/core/dev.c:4947 [inline] napi_gro_receive+0x2e2/0x400 net/core/dev.c:4978 receive_buf+0x9f2/0x4d70 drivers/net/virtio_net.c:856 virtnet_receive drivers/net/virtio_net.c:1102 [inline] virtnet_poll+0x4b7/0x960 drivers/net/virtio_net.c:1193 napi_poll net/core/dev.c:5604 [inline] net_rx_action+0x466/0xfd0 net/core/dev.c:5670 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:638 [inline] do_IRQ+0x112/0x1d0 arch/x86/kernel/irq.c:242 common_interrupt+0x93/0x93 arch/x86/entry/entry_64.S:576 RIP: 0010:__read_once_size include/linux/compiler.h:185 [inline] RIP: 0010:__rcu_read_unlock+0xd2/0x160 kernel/rcu/update.c:259 RSP: 0018:ffff888051e9f0c8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffffdd RAX: 0000000000000004 RBX: ffff88805c0c2540 RCX: ffffc90008af5000 RDX: 0000000000000000 RSI: ffffffff815e39e6 RDI: ffff88805c0c28c4 RBP: ffff88805c0c28c0 R08: 0000000000000000 R09: 0000000000020011 R10: ffff88805c0c2df0 R11: ffff88805c0c2540 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8880a4b51200 R15: 0000000000000100 rcu_read_unlock include/linux/rcupdate.h:684 [inline] is_bpf_text_address+0x9b/0x150 kernel/bpf/core.c:502 kernel_text_address kernel/extable.c:150 [inline] kernel_text_address+0xbd/0xf0 kernel/extable.c:120 __kernel_text_address+0x9/0x30 kernel/extable.c:105 unwind_get_return_address arch/x86/kernel/unwind_orc.c:252 [inline] unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:247 __save_stack_trace+0xa0/0x160 arch/x86/kernel/stacktrace.c:45 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc+0x111/0x3c0 mm/slab.c:3550 kmem_cache_zalloc include/linux/slab.h:651 [inline] sctp_chunkify+0x4b/0x2d0 net/sctp/sm_make_chunk.c:1330 _sctp_make_chunk+0x13d/0x250 net/sctp/sm_make_chunk.c:1403 sctp_make_data net/sctp/sm_make_chunk.c:1424 [inline] sctp_make_datafrag_empty+0x146/0x210 net/sctp/sm_make_chunk.c:738 sctp_datamsg_from_user+0x5ea/0xdd0 net/sctp/chunk.c:268 sctp_sendmsg+0x1339/0x2f30 net/sctp/socket.c:2037 inet_sendmsg+0x11a/0x4e0 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 sock_no_sendpage+0xe2/0x110 net/core/sock.c:2610 kernel_sendpage net/socket.c:3409 [inline] sock_sendpage+0x10d/0x140 net/socket.c:871 pipe_to_sendpage+0x226/0x2d0 fs/splice.c:451 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x326/0x7a0 fs/splice.c:626 splice_from_pipe fs/splice.c:661 [inline] generic_splice_sendpage+0xc1/0x110 fs/splice.c:832 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x115/0x160 fs/splice.c:1018 splice_direct_to_actor+0x27c/0x730 fs/splice.c:973 do_splice_direct+0x164/0x210 fs/splice.c:1061 do_sendfile+0x47f/0xb30 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0xff/0x110 fs/read_write.c:1488 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f04552f9209 RSP: 002b:00007f0453c6e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f045540bf60 RCX: 00007f04552f9209 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 RBP: 00007f0455353161 R08: 0000000000000000 R09: 0000000000000000 R10: 000080001d00c0d0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffb4dafa5f R14: 00007f0453c6e300 R15: 0000000000022000 Allocated by task 11508: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] fanout_add net/packet/af_packet.c:1744 [inline] packet_setsockopt+0x19a6/0x26d0 net/packet/af_packet.c:3931 SYSC_setsockopt net/socket.c:1865 [inline] SyS_setsockopt+0x110/0x1e0 net/socket.c:1844 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 11504: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 packet_release+0x728/0xa80 net/packet/af_packet.c:3122 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff88809b488b80 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 2224 bytes inside of 4096-byte region [ffff88809b488b80, ffff88809b489b80) The buggy address belongs to the page: page:ffffea00026d2200 count:1 mapcount:0 mapping:ffff88809b488b80 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff88809b488b80 0000000000000000 0000000100000001 raw: ffffea000260f6a0 ffffea0002713920 ffff88813fe74dc0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809b489300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809b489380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809b489400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809b489480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809b489500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================