================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:193 [inline] BUG: KASAN: use-after-free in dev_queue_xmit_nit+0x87e/0xa20 net/core/dev.c:2004 Read of size 8 at addr ffff8880a46b7170 by task syz-executor.4/10372 CPU: 0 PID: 10372 Comm: syz-executor.4 Not tainted 4.19.140-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2fe lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 __read_once_size include/linux/compiler.h:193 [inline] dev_queue_xmit_nit+0x87e/0xa20 net/core/dev.c:2004 xmit_one net/core/dev.c:3252 [inline] dev_hard_start_xmit+0xaa/0x920 net/core/dev.c:3272 __dev_queue_xmit+0x269d/0x2e00 net/core/dev.c:3838 hsr_xmit net/hsr/hsr_forward.c:237 [inline] hsr_forward_do net/hsr/hsr_forward.c:295 [inline] hsr_forward_skb+0xd2d/0x1c30 net/hsr/hsr_forward.c:373 send_hsr_supervision_frame+0x917/0xf70 net/hsr/hsr_device.c:321 hsr_announce+0x125/0x3a0 net/hsr/hsr_device.c:350 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1703 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1716 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:544 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:184 Code: 48 c7 c0 48 5b d2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 2f 48 83 3d fc ea 94 01 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 eb b2 e8 9a ee c2 f9 eb c0 0f 0b 0f 0b 48 c7 c7 48 RSP: 0018:ffff88808afffa88 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11a4b69 RBX: 0000000000000286 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffff888088adccc8 RDI: 0000000000000286 RBP: ffffffff88d95b00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888088adc440 R13: ffffffff88d95bc0 R14: ffff888088adc7b8 R15: ffffffff88d95b00 rcu_read_unlock_special+0x7ce/0xfc0 kernel/rcu/tree_plugin.h:587 __rcu_read_unlock+0x158/0x160 kernel/rcu/tree_plugin.h:428 rcu_read_unlock include/linux/rcupdate.h:680 [inline] mntput_no_expire+0xfc/0xa30 fs/namespace.c:1133 mntput+0x67/0x90 fs/namespace.c:1187 __fput+0x41d/0x890 fs/file_table.c:292 task_work_run+0x148/0x1c0 kernel/task_work.c:113 get_signal+0x1b64/0x1f70 kernel/signal.c:2399 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d4d9 Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f7b02429c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: 0000000020ffc000 RBX: 000000000001ff40 RCX: 000000000045d4d9 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffc000 RBP: 000000000118d0d8 R08: 0000000000000004 R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000246 R12: 000000000118d08c R13: 00007fffdef7c3ef R14: 00007f7b0242a9c0 R15: 000000000118d08c Allocated by task 10371: __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15a/0x3c0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] sk_prot_alloc+0x1e2/0x2d0 net/core/sock.c:1466 sk_alloc+0x36/0xec0 net/core/sock.c:1520 packet_create+0x117/0x850 net/packet/af_packet.c:3252 __sock_create+0x3d8/0x740 net/socket.c:1276 sock_create net/socket.c:1316 [inline] __sys_socket+0xef/0x200 net/socket.c:1346 __do_sys_socket net/socket.c:1355 [inline] __se_sys_socket net/socket.c:1353 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1353 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 10370: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 sk_prot_free net/core/sock.c:1503 [inline] __sk_destruct+0x5ff/0x810 net/core/sock.c:1584 sk_destruct net/core/sock.c:1599 [inline] __sk_free+0x165/0x3b0 net/core/sock.c:1610 sk_free+0x3b/0x50 net/core/sock.c:1621 sock_put include/net/sock.h:1707 [inline] packet_release+0x890/0xb70 net/packet/af_packet.c:3081 __sock_release+0xcd/0x2a0 net/socket.c:579 sock_close+0x15/0x20 net/socket.c:1140 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a46b6980 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 2032 bytes inside of 2048-byte region [ffff8880a46b6980, ffff8880a46b7180) The buggy address belongs to the page: page:ffffea000291ad80 count:1 mapcount:0 mapping:ffff88812c39cc40 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffffea000294d908 ffffea0002929188 ffff88812c39cc40 raw: 0000000000000000 ffff8880a46b6100 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a46b7000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a46b7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a46b7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a46b7180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a46b7200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================