================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:207 [inline] BUG: KASAN: use-after-free in deliver_ptype_list_skb net/core/dev.c:1967 [inline] BUG: KASAN: use-after-free in __netif_receive_skb_core+0x2b84/0x3270 net/core/dev.c:4910 Read of size 8 at addr ffff88809b217570 by task syz-executor.4/9918 CPU: 0 PID: 9918 Comm: syz-executor.4 Not tainted 4.19.177-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/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 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:207 [inline] deliver_ptype_list_skb net/core/dev.c:1967 [inline] __netif_receive_skb_core+0x2b84/0x3270 net/core/dev.c:4910 __netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:4952 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066 process_backlog+0x241/0x700 net/core/dev.c:5848 napi_poll net/core/dev.c:6272 [inline] net_rx_action+0x4ac/0xfb0 net/core/dev.c:6338 __do_softirq+0x265/0x980 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:535 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 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:rcu_read_unlock_special+0x456/0xfc0 kernel/rcu/tree_plugin.h:601 Code: 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 bd 09 00 00 48 83 3d 3e 41 a0 08 00 0f 84 37 06 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 83 c4 40 5b 5d 41 5c 41 5d 41 5e 41 5f c3 c3 48 RSP: 0018:ffff8880554af750 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3041 RBX: 0000000000000000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffff88809a77ee08 RDI: 0000000000000286 RBP: ffff88809a77e8f4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809a77e580 R13: ffff88809a77e8f6 R14: ffff88809a77e8f5 R15: ffffffff89f88080 __rcu_read_unlock+0x158/0x160 kernel/rcu/tree_plugin.h:428 rcu_read_unlock include/linux/rcupdate.h:680 [inline] __perf_event_output kernel/events/core.c:6602 [inline] perf_event_output_forward+0x174/0x270 kernel/events/core.c:6610 __perf_event_overflow+0x13c/0x370 kernel/events/core.c:7883 perf_swevent_overflow kernel/events/core.c:7959 [inline] perf_swevent_event+0x347/0x550 kernel/events/core.c:7987 perf_tp_event+0x29f/0xaa0 kernel/events/core.c:8415 perf_trace_run_bpf_submit+0x144/0x220 kernel/events/core.c:8389 perf_trace_sys_exit+0x2dc/0x460 include/trace/events/syscalls.h:44 trace_sys_exit include/trace/events/syscalls.h:44 [inline] syscall_slow_exit_work+0x36c/0x630 arch/x86/entry/common.c:231 syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x523/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x41920b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007f1961e0bee0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 00007f1961e0bf40 RCX: 000000000041920b RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000007 RBP: 00007f1961e0c6bc R08: 0000000000000000 R09: 00007f1961e0bd90 R10: 00007f1961e0bc47 R11: 0000000000000293 R12: 0000000000000008 R13: 0000000000000000 R14: 0000000000000000 R15: 00007f1961e0bf80 Allocated by task 9943: __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:3259 __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 9905: __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+0x684/0x8a0 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:1711 [inline] packet_release+0x890/0xb70 net/packet/af_packet.c:3088 __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 ffff88809b216d80 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 2032 bytes inside of 2048-byte region [ffff88809b216d80, ffff88809b217580) The buggy address belongs to the page: page:ffffea00026c8580 count:1 mapcount:0 mapping:ffff88813bff0c40 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffffea00026c0788 ffffea00026e2808 ffff88813bff0c40 raw: 0000000000000000 ffff88809b216500 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809b217400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809b217480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809b217500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809b217580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809b217600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================