================================================================== 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 1428 at addr ffff88802bbe56d4 by task syz-executor.4/16471 CPU: 0 PID: 16471 Comm: syz-executor.4 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 ipip_gso_segment+0xbe/0xf0 net/ipv4/af_inet.c:1430 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] validate_xmit_skb+0x69e/0xee0 net/core/dev.c:3644 __dev_queue_xmit+0x988/0x2dd0 net/core/dev.c:4142 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+0xaf/0x1a0 net/ipv4/ip_output.c:126 iptunnel_xmit+0x5a3/0x9c0 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x1116/0x2b00 net/ipv4/ip_tunnel.c:806 sit_tunnel_xmit__ net/ipv6/sit.c:1060 [inline] sit_tunnel_xmit+0x4fd/0x2a80 net/ipv6/sit.c:1076 __netdev_start_xmit include/linux/netdevice.h:4762 [inline] netdev_start_xmit include/linux/netdevice.h:4776 [inline] xmit_one net/core/dev.c:3574 [inline] dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3590 __dev_queue_xmit+0x21db/0x2dd0 net/core/dev.c:4151 neigh_connected_output+0x380/0x4c0 net/core/neighbour.c:1519 neigh_output include/net/neighbour.h:510 [inline] ip_finish_output2+0x83d/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_sendmsg_locked+0xa1c/0x2e40 net/ipv4/tcp.c:1410 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1459 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:817 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 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:00007f639bbf6c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000006d70 RSI: 0000000020001400 RDI: 0000000000000009 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffe5e8fdcdf R14: 00007f639bbf79c0 R15: 000000000119bf8c Allocated by task 16471: 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 tcp_sendmsg_locked+0xc00/0x2e40 net/ipv4/tcp.c:1310 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1459 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:817 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88802bbe5000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 724 bytes to the right of 1024-byte region [ffff88802bbe5000, ffff88802bbe5400) The buggy address belongs to the page: page:0000000027ade6bc refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2bbe4 head:0000000027ade6bc order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010041dc0 raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88802bbe5580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802bbe5600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802bbe5680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88802bbe5700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802bbe5780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================