================================================================== 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 104 at addr ffff8880282263b0 by task ksoftirqd/0/12 CPU: 0 PID: 12 Comm: ksoftirqd/0 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 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:4708 [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:5393 [inline] tcp_rcv_established+0x8c9/0x1eb0 net/ipv4/tcp_input.c:5888 tcp_v4_do_rcv+0x5d1/0x870 net/ipv4/tcp_ipv4.c:1676 tcp_v4_rcv+0x2d36/0x3780 net/ipv4/tcp_ipv4.c:2058 ip_protocol_deliver_rcu+0x5c/0x8a0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x20a/0x370 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:301 [inline] NF_HOOK include/linux/netfilter.h:295 [inline] ip_local_deliver+0x1b3/0x200 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:447 [inline] ip_rcv_finish+0x1da/0x2f0 net/ipv4/ip_input.c:428 NF_HOOK include/linux/netfilter.h:301 [inline] NF_HOOK include/linux/netfilter.h:295 [inline] ip_rcv+0xaa/0xd0 net/ipv4/ip_input.c:539 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5319 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5433 process_backlog+0x232/0x6c0 net/core/dev.c:6312 napi_poll net/core/dev.c:6790 [inline] net_rx_action+0x461/0xe10 net/core/dev.c:6873 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343 run_ksoftirqd kernel/softirq.c:650 [inline] run_ksoftirqd+0x2d/0x50 kernel/softirq.c:642 smpboot_thread_fn+0x655/0x9e0 kernel/smpboot.c:165 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Allocated by task 11113: 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 tso_fragment net/ipv4/tcp_output.c:2125 [inline] tcp_write_xmit+0x1d2b/0x6140 net/ipv4/tcp_output.c:2675 tcp_send_loss_probe+0x542/0x8d0 net/ipv4/tcp_output.c:2807 tcp_write_timer_handler+0x675/0xaa0 net/ipv4/tcp_timer.c:606 tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:630 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417 expire_timers kernel/time/timer.c:1462 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731 __run_timers kernel/time/timer.c:1712 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343 The buggy address belongs to the object at ffff888028226000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 944 bytes inside of 1024-byte region [ffff888028226000, ffff888028226400) The buggy address belongs to the page: page:00000000a99f4d90 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28224 head:00000000a99f4d90 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010041140 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888028226300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888028226380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888028226400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888028226480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888028226500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================