================================================================== 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 104 at addr ffff88802bb81bb0 by task syz-executor.0/26663 CPU: 0 PID: 26663 Comm: syz-executor.0 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_retransmit_skb+0x6b9/0x2b70 net/ipv4/tcp_output.c:3237 tcp_retransmit_skb+0x2a/0x360 net/ipv4/tcp_output.c:3260 tcp_xmit_retransmit_queue.part.0+0x3fa/0x990 net/ipv4/tcp_output.c:3342 tcp_xmit_retransmit_queue+0x57/0x70 net/ipv4/tcp_output.c:3296 tcp_xmit_recovery net/ipv4/tcp_input.c:3669 [inline] tcp_xmit_recovery+0x86/0x180 net/ipv4/tcp_input.c:3655 tcp_ack+0x2636/0x5990 net/ipv4/tcp_input.c:3842 tcp_rcv_established+0x56b/0x1eb0 net/ipv4/tcp_input.c:5878 tcp_v4_do_rcv+0x5d1/0x870 net/ipv4/tcp_ipv4.c:1676 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 do_recvmmsg+0x24d/0x6c0 net/socket.c:2710 __sys_recvmmsg net/socket.c:2789 [inline] __do_sys_recvmmsg net/socket.c:2812 [inline] __se_sys_recvmmsg net/socket.c:2805 [inline] __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2805 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:00007f8ebfdc0c68 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: 0000000000000001 RSI: 0000000020005540 RDI: 0000000000000004 RBP: 000000000119bfd0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffeb87865cf R14: 00007f8ebfdc19c0 R15: 000000000119bf8c Allocated by task 26663: 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_fragment+0x1c6/0x15f0 net/ipv4/tcp_output.c:1569 __tcp_retransmit_skb+0x437/0x2b70 net/ipv4/tcp_output.c:3186 tcp_retransmit_skb+0x2a/0x360 net/ipv4/tcp_output.c:3260 tcp_xmit_retransmit_queue.part.0+0x3fa/0x990 net/ipv4/tcp_output.c:3342 tcp_xmit_retransmit_queue+0x57/0x70 net/ipv4/tcp_output.c:3296 tcp_xmit_recovery net/ipv4/tcp_input.c:3669 [inline] tcp_xmit_recovery+0x86/0x180 net/ipv4/tcp_input.c:3655 tcp_ack+0x2636/0x5990 net/ipv4/tcp_input.c:3842 tcp_rcv_established+0x56b/0x1eb0 net/ipv4/tcp_input.c:5878 tcp_v4_do_rcv+0x5d1/0x870 net/ipv4/tcp_ipv4.c:1676 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 do_recvmmsg+0x24d/0x6c0 net/socket.c:2710 __sys_recvmmsg net/socket.c:2789 [inline] __do_sys_recvmmsg net/socket.c:2812 [inline] __se_sys_recvmmsg net/socket.c:2805 [inline] __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2805 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 ffff88802bb81800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 944 bytes inside of 1024-byte region [ffff88802bb81800, ffff88802bb81c00) The buggy address belongs to the page: page:00000000a85f386f refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2bb80 head:00000000a85f386f order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 0000000000000000 0000000500000001 ffff888010041dc0 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88802bb81b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88802bb81b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88802bb81c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88802bb81c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802bb81d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================