8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 8021q: adding VLAN 0 to HW filter on device team0 protocol 0000 is buggy, dev sit0 ================================================================== BUG: KASAN: use-after-free in atomic_sub_return include/asm-generic/atomic-instrumented.h:258 [inline] BUG: KASAN: use-after-free in skb_release_data+0x19b/0x860 net/core/skbuff.c:559 Write of size 4 at addr ffff8801bb5c03a0 by task syzkaller393301/4486 CPU: 1 PID: 4486 Comm: syzkaller393301 Not tainted 4.16.0+ #3 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+0x1b9/0x294 lib/dump_stack.c:113 protocol 0000 is buggy, dev sit0 protocol 0000 is buggy, dev sit0 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 protocol 0000 is buggy, dev sit0 kasan_check_write+0x14/0x20 mm/kasan/kasan.c:278 atomic_sub_return include/asm-generic/atomic-instrumented.h:258 [inline] skb_release_data+0x19b/0x860 net/core/skbuff.c:559 protocol 0000 is buggy, dev sit0 protocol 0000 is buggy, dev sit0 protocol 0000 is buggy, dev sit0 skb_release_all+0x4a/0x60 net/core/skbuff.c:627 protocol 0000 is buggy, dev sit0 __kfree_skb net/core/skbuff.c:641 [inline] kfree_skb+0x195/0x560 net/core/skbuff.c:659 protocol 0000 is buggy, dev sit0 protocol 0000 is buggy, dev sit0 sit_tunnel_xmit+0x16b/0x30b0 net/ipv6/sit.c:1044 __netdev_start_xmit include/linux/netdevice.h:4087 [inline] netdev_start_xmit include/linux/netdevice.h:4096 [inline] xmit_one net/core/dev.c:3053 [inline] dev_hard_start_xmit+0x264/0xc10 net/core/dev.c:3069 __dev_queue_xmit+0x2724/0x34c0 net/core/dev.c:3584 dev_queue_xmit+0x17/0x20 net/core/dev.c:3617 packet_snd net/packet/af_packet.c:2944 [inline] packet_sendmsg+0x411c/0x60b0 net/packet/af_packet.c:2969 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:639 __sys_sendto+0x3d7/0x670 net/socket.c:1789 SYSC_sendto net/socket.c:1801 [inline] SyS_sendto+0x40/0x60 net/socket.c:1797 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x441b39 RSP: 002b:00007ffc0734f1c8 EFLAGS: 00000216 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441b39 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000004 RBP: 00000000006cd018 R08: 0000000020005fe4 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000216 R12: 0000000000402780 R13: 0000000000402810 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 4486: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3696 __kmalloc_reserve.isra.38+0x3a/0xe0 net/core/skbuff.c:137 __alloc_skb+0x14d/0x780 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:987 [inline] alloc_skb_with_frags+0x137/0x760 net/core/skbuff.c:5249 sock_alloc_send_pskb+0x87a/0xae0 net/core/sock.c:2088 packet_alloc_skb net/packet/af_packet.c:2803 [inline] packet_snd net/packet/af_packet.c:2894 [inline] packet_sendmsg+0x1bd1/0x60b0 net/packet/af_packet.c:2969 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:639 __sys_sendto+0x3d7/0x670 net/socket.c:1789 SYSC_sendto net/socket.c:1801 [inline] SyS_sendto+0x40/0x60 net/socket.c:1797 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 4486: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 skb_free_head+0x99/0xc0 net/core/skbuff.c:550 skb_release_data+0x690/0x860 net/core/skbuff.c:570 skb_release_all+0x4a/0x60 net/core/skbuff.c:627 __kfree_skb net/core/skbuff.c:641 [inline] consume_skb+0x18b/0x550 net/core/skbuff.c:701 packet_rcv+0x16a/0x1800 net/packet/af_packet.c:2162 dev_queue_xmit_nit+0x891/0xb90 net/core/dev.c:2018 xmit_one net/core/dev.c:3049 [inline] dev_hard_start_xmit+0x16b/0xc10 net/core/dev.c:3069 __dev_queue_xmit+0x2724/0x34c0 net/core/dev.c:3584 dev_queue_xmit+0x17/0x20 net/core/dev.c:3617 packet_snd net/packet/af_packet.c:2944 [inline] packet_sendmsg+0x411c/0x60b0 net/packet/af_packet.c:2969 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:639 __sys_sendto+0x3d7/0x670 net/socket.c:1789 SYSC_sendto net/socket.c:1801 [inline] SyS_sendto+0x40/0x60 net/socket.c:1797 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8801bb5c02c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 224 bytes inside of 512-byte region [ffff8801bb5c02c0, ffff8801bb5c04c0) The buggy address belongs to the page: page:ffffea0006ed7000 count:1 mapcount:0 mapping:ffff8801bb5c0040 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801bb5c0040 0000000000000000 0000000100000006 raw: ffffea0006d8e2a0 ffffea0007339720 ffff8801dac00940 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801bb5c0280: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8801bb5c0300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801bb5c0380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801bb5c0400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801bb5c0480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 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