================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:447 [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:3996 Read of size 1428 at addr ffff888017c95ed4 by task syz-executor.4/23851 CPU: 1 PID: 23851 Comm: syz-executor.4 Not tainted 5.11.0-rc3-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:396 [inline] kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413 check_memory_region_inline mm/kasan/generic.c:179 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:185 memcpy+0x20/0x60 mm/kasan/shadow.c:64 memcpy include/linux/string.h:447 [inline] skb_copy_from_linear_data_offset include/linux/skbuff.h:3676 [inline] skb_segment+0x14ba/0x37a0 net/core/skbuff.c:3996 tcp_gso_segment+0x33d/0x17e0 net/ipv4/tcp_offload.c:98 tcp6_gso_segment net/ipv6/tcpv6_offload.c:65 [inline] tcp6_gso_segment+0x1a0/0x460 net/ipv6/tcpv6_offload.c:41 ipv6_gso_segment+0x48d/0xf50 net/ipv6/ip6_offload.c:115 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:4708 [inline] tbf_segment net/sched/sch_tbf.c:199 [inline] tbf_enqueue+0x263/0x980 net/sched/sch_tbf.c:234 __dev_xmit_skb net/core/dev.c:3807 [inline] __dev_queue_xmit+0x1913/0x2dd0 net/core/dev.c:4119 br_dev_queue_push_xmit+0x4ca/0x6e0 net/bridge/br_forward.c:52 NF_HOOK include/linux/netfilter.h:301 [inline] NF_HOOK include/linux/netfilter.h:295 [inline] br_forward_finish net/bridge/br_forward.c:65 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] NF_HOOK include/linux/netfilter.h:295 [inline] __br_forward+0x46d/0x610 net/bridge/br_forward.c:109 br_forward+0x436/0x550 net/bridge/br_forward.c:158 br_dev_xmit+0xe4d/0x1690 net/bridge/br_device.c:97 __netdev_start_xmit include/linux/netdevice.h:4758 [inline] netdev_start_xmit include/linux/netdevice.h:4772 [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_hh_output include/net/neighbour.h:499 [inline] neigh_output include/net/neighbour.h:508 [inline] ip6_finish_output2+0x8db/0x16c0 net/ipv6/ip6_output.c:117 __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] NF_HOOK include/linux/netfilter.h:295 [inline] ip6_xmit+0x127e/0x1eb0 net/ipv6/ip6_output.c:319 inet6_csk_xmit+0x358/0x630 net/ipv6/inet6_connection_sock.c:135 __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:5393 [inline] tcp_rcv_established+0x13a5/0x1eb0 net/ipv4/tcp_input.c:5803 tcp_v6_do_rcv+0x41d/0x12b0 net/ipv6/tcp_ipv6.c:1482 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_stream_wait_memory+0x608/0xed0 net/core/stream.c:145 tcp_sendmsg_locked+0x1072/0x2e40 net/ipv4/tcp.c:1419 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1459 inet6_sendmsg+0x99/0xe0 net/ipv6/af_inet6.c:638 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 __sys_sendto+0x21c/0x320 net/socket.c:1975 __do_sys_sendto net/socket.c:1987 [inline] __se_sys_sendto net/socket.c:1983 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1983 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:00007f82ce8cac68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045e219 RDX: 00000000fffffdef RSI: 0000000020000080 RDI: 0000000000000003 RBP: 000000000119bfd8 R08: 0000000000000000 R09: 000000000e0000c5 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffde4300a6f R14: 00007f82ce8cb9c0 R15: 000000000119bf8c Allocated by task 23851: 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:401 [inline] ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429 kasan_slab_alloc include/linux/kasan.h:205 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2891 [inline] __kmalloc_node_track_caller+0x1e0/0x3f0 mm/slub.c:4495 __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 inet6_sendmsg+0x99/0xe0 net/ipv6/af_inet6.c:638 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 __sys_sendto+0x21c/0x320 net/socket.c:1975 __do_sys_sendto net/socket.c:1987 [inline] __se_sys_sendto net/socket.c:1983 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1983 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 ffff888017c95800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 724 bytes to the right of 1024-byte region [ffff888017c95800, ffff888017c95c00) The buggy address belongs to the page: page:000000001d6f88f1 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x17c94 head:000000001d6f88f1 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888010041140 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888017c95d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888017c95e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888017c95e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888017c95f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888017c95f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================