================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/fortify-string.h:191 [inline] BUG: KASAN: slab-out-of-bounds in skb_copy_from_linear_data_offset include/linux/skbuff.h:3676 [inline] BUG: KASAN: slab-out-of-bounds in skb_segment+0x14ba/0x37a0 net/core/skbuff.c:4000 Read of size 116 at addr ffff88802df08bf8 by task syz-executor.1/11112 CPU: 0 PID: 11112 Comm: syz-executor.1 Not tainted 5.11.0-rc4-next-20210120-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:397 [inline] kasan_report.cold+0x79/0xd5 mm/kasan/report.c:414 check_region_inline mm/kasan/generic.c:180 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186 memcpy+0x20/0x60 mm/kasan/shadow.c:65 memcpy include/linux/fortify-string.h:191 [inline] skb_copy_from_linear_data_offset include/linux/skbuff.h:3676 [inline] skb_segment+0x14ba/0x37a0 net/core/skbuff.c:4000 tcp_gso_segment+0x33d/0x17e0 net/ipv4/tcp_offload.c:98 tcp4_gso_segment net/ipv4/tcp_offload.c:51 [inline] tcp4_gso_segment+0x194/0x3a0 net/ipv4/tcp_offload.c:29 inet_gso_segment+0x502/0x1110 net/ipv4/af_inet.c:1378 skb_mac_gso_segment+0x26e/0x530 net/core/dev.c:3326 __skb_gso_segment+0x330/0x6e0 net/core/dev.c:3399 skb_gso_segment include/linux/netdevice.h:4712 [inline] cake_enqueue+0x2808/0x39f0 net/sched/sch_cake.c:1742 __dev_xmit_skb net/core/dev.c:3807 [inline] __dev_queue_xmit+0x1913/0x2dd0 net/core/dev.c:4119 neigh_hh_output include/net/neighbour.h:499 [inline] neigh_output include/net/neighbour.h:508 [inline] ip_finish_output2+0xeb6/0x21b0 net/ipv4/ip_output.c:230 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x396/0x640 net/ipv4/ip_output.c:290 ip_finish_output+0x35/0x200 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip_output+0x196/0x310 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:441 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x8e9/0x1a00 net/ipv4/ip_output.c:532 __tcp_transmit_skb+0x188c/0x38f0 net/ipv4/tcp_output.c:1405 tcp_transmit_skb net/ipv4/tcp_output.c:1423 [inline] tcp_write_xmit+0xde7/0x6140 net/ipv4/tcp_output.c:2689 __tcp_push_pending_frames+0xaa/0x390 net/ipv4/tcp_output.c:2869 tcp_push_pending_frames include/net/tcp.h:1867 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:5394 [inline] tcp_rcv_state_process+0xe96/0x4cb0 net/ipv4/tcp_input.c:6554 tcp_v4_do_rcv+0x320/0x870 net/ipv4/tcp_ipv4.c:1698 sk_backlog_rcv include/net/sock.h:1016 [inline] __release_sock+0x134/0x3a0 net/core/sock.c:2542 release_sock+0x54/0x1b0 net/core/sock.c:3066 sk_wait_data+0x177/0x450 net/core/sock.c:2584 tcp_recvmsg_locked+0xd33/0x2820 net/ipv4/tcp.c:2396 tcp_recvmsg+0x134/0x550 net/ipv4/tcp.c:2511 inet_recvmsg+0x11b/0x5d0 net/ipv4/af_inet.c:848 sock_recvmsg_nosec net/socket.c:886 [inline] sock_recvmsg net/socket.c:904 [inline] sock_recvmsg net/socket.c:900 [inline] ____sys_recvmsg+0x2c4/0x600 net/socket.c:2568 ___sys_recvmsg+0x127/0x200 net/socket.c:2610 __sys_recvmsg+0xe2/0x1a0 net/socket.c:2646 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f7814548c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000000100 RSI: 0000000020001440 RDI: 0000000000000004 RBP: 000000000119c068 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffe5d9b507f R14: 00007f78145499c0 R15: 000000000119c034 Allocated by task 11112: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:403 [inline] ____kasan_kmalloc mm/kasan/common.c:434 [inline] ____kasan_kmalloc.constprop.0+0xa0/0xd0 mm/kasan/common.c:406 kasan_slab_alloc include/linux/kasan.h:208 [inline] slab_post_alloc_hook mm/slab.h:518 [inline] slab_alloc_node mm/slub.c:2910 [inline] __kmalloc_node_track_caller+0x191/0x320 mm/slub.c:4584 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xae/0x5a0 net/core/skbuff.c:210 alloc_skb_fclone include/linux/skbuff.h:1150 [inline] sk_stream_alloc_skb+0x109/0xc30 net/ipv4/tcp.c:888 tso_fragment net/ipv4/tcp_output.c:2125 [inline] tcp_write_xmit+0x1d2b/0x6140 net/ipv4/tcp_output.c:2675 __tcp_push_pending_frames+0xaa/0x390 net/ipv4/tcp_output.c:2869 tcp_push_pending_frames include/net/tcp.h:1867 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:5394 [inline] tcp_rcv_state_process+0xe96/0x4cb0 net/ipv4/tcp_input.c:6554 tcp_v4_do_rcv+0x320/0x870 net/ipv4/tcp_ipv4.c:1698 sk_backlog_rcv include/net/sock.h:1016 [inline] __release_sock+0x134/0x3a0 net/core/sock.c:2542 release_sock+0x54/0x1b0 net/core/sock.c:3066 sk_wait_data+0x177/0x450 net/core/sock.c:2584 tcp_recvmsg_locked+0xd33/0x2820 net/ipv4/tcp.c:2396 tcp_recvmsg+0x134/0x550 net/ipv4/tcp.c:2511 inet_recvmsg+0x11b/0x5d0 net/ipv4/af_inet.c:848 sock_recvmsg_nosec net/socket.c:886 [inline] sock_recvmsg net/socket.c:904 [inline] sock_recvmsg net/socket.c:900 [inline] ____sys_recvmsg+0x2c4/0x600 net/socket.c:2568 ___sys_recvmsg+0x127/0x200 net/socket.c:2610 __sys_recvmsg+0xe2/0x1a0 net/socket.c:2646 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345 kvfree_call_rcu+0x104/0x7c0 kernel/rcu/tree.c:3549 neigh_destroy+0x3ff/0x5f0 net/core/neighbour.c:858 neigh_release include/net/neighbour.h:425 [inline] neigh_cleanup_and_release+0x1fd/0x340 net/core/neighbour.c:103 neigh_del net/core/neighbour.c:193 [inline] neigh_remove_one+0x3cf/0x450 net/core/neighbour.c:214 neigh_forced_gc net/core/neighbour.c:243 [inline] neigh_alloc net/core/neighbour.c:390 [inline] ___neigh_create+0x16aa/0x25d0 net/core/neighbour.c:578 ip6_finish_output2+0xdf8/0x16c0 net/ipv6/ip6_output.c:114 __ip6_finish_output net/ipv6/ip6_output.c:182 [inline] __ip6_finish_output+0x4c1/0xe10 net/ipv6/ip6_output.c:161 ip6_finish_output+0x35/0x200 net/ipv6/ip6_output.c:192 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip6_output+0x1db/0x520 net/ipv6/ip6_output.c:215 dst_output include/net/dst.h:441 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ndisc_send_skb+0xa90/0x1750 net/ipv6/ndisc.c:508 ndisc_send_ns+0x3a9/0x850 net/ipv6/ndisc.c:650 addrconf_dad_work+0xc1c/0x1280 net/ipv6/addrconf.c:4117 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 The buggy address belongs to the object at ffff88802df08800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 1016 bytes inside of 1024-byte region [ffff88802df08800, ffff88802df08c00) The buggy address belongs to the page: page:00000000bcaf671a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2df08 head:00000000bcaf671a order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010041dc0 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88802df08b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88802df08b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88802df08c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88802df08c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802df08d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================