protocol 86dd is buggy, dev sit0
protocol 86dd is buggy, dev sit0
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:352 [inline]
BUG: KASAN: slab-out-of-bounds in skb_copy_from_linear_data include/linux/skbuff.h:3414 [inline]
BUG: KASAN: slab-out-of-bounds in __pskb_copy_fclone+0x2dd/0xeb0 net/core/skbuff.c:1395
protocol 86dd is buggy, dev sit0
Read of size 4294967282 at addr ffff88019225005c by task syz-executor0/22019

CPU: 0 PID: 22019 Comm: syz-executor0 Not tainted 4.20.0-rc1+ #136
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x244/0x39d lib/dump_stack.c:113
protocol 86dd is buggy, dev sit0
 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 memcpy+0x23/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:352 [inline]
 skb_copy_from_linear_data include/linux/skbuff.h:3414 [inline]
 __pskb_copy_fclone+0x2dd/0xeb0 net/core/skbuff.c:1395
protocol 86dd is buggy, dev sit0
 __pskb_copy include/linux/skbuff.h:1053 [inline]
 pskb_copy include/linux/skbuff.h:2897 [inline]
 skb_realloc_headroom+0xe7/0x120 net/core/skbuff.c:1539
 ipip6_tunnel_xmit net/ipv6/sit.c:965 [inline]
 sit_tunnel_xmit+0xe1b/0x30d0 net/ipv6/sit.c:1029
 __netdev_start_xmit include/linux/netdevice.h:4356 [inline]
 netdev_start_xmit include/linux/netdevice.h:4365 [inline]
 xmit_one net/core/dev.c:3252 [inline]
 dev_hard_start_xmit+0x295/0xc80 net/core/dev.c:3268
 __dev_queue_xmit+0x2f71/0x3ad0 net/core/dev.c:3838
 dev_queue_xmit+0x17/0x20 net/core/dev.c:3871
 __bpf_tx_skb net/core/filter.c:2017 [inline]
 __bpf_redirect_common net/core/filter.c:2055 [inline]
 __bpf_redirect+0x5cf/0xb20 net/core/filter.c:2062
 ____bpf_clone_redirect net/core/filter.c:2095 [inline]
 bpf_clone_redirect+0x2f6/0x490 net/core/filter.c:2067
 bpf_prog_88483476fbe68a28+0x6fd/0x1000

Allocated by task 22019:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
 __do_kmalloc_node mm/slab.c:3684 [inline]
 __kmalloc_node_track_caller+0x50/0x70 mm/slab.c:3698
 __kmalloc_reserve.isra.40+0x41/0xe0 net/core/skbuff.c:137
 pskb_expand_head+0x230/0x10f0 net/core/skbuff.c:1460
 skb_ensure_writable+0x3dd/0x640 net/core/skbuff.c:5073
 __bpf_try_make_writable net/core/filter.c:1638 [inline]
 bpf_try_make_writable net/core/filter.c:1644 [inline]
 bpf_try_make_head_writable net/core/filter.c:1652 [inline]
 ____bpf_clone_redirect net/core/filter.c:2089 [inline]
 bpf_clone_redirect+0x14a/0x490 net/core/filter.c:2067
 bpf_prog_88483476fbe68a28+0x6fd/0x1000

Freed by task 20835:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xcf/0x230 mm/slab.c:3817
 skb_free_head+0x99/0xc0 net/core/skbuff.c:550
 skb_release_data+0x6a4/0x880 net/core/skbuff.c:570
 skb_release_all+0x4a/0x60 net/core/skbuff.c:627
 __kfree_skb net/core/skbuff.c:641 [inline]
 kfree_skb+0x1bb/0x580 net/core/skbuff.c:659
 arp_error_report+0xde/0x1c0 net/ipv4/arp.c:298
 neigh_invalidate+0x246/0x550 net/core/neighbour.c:913
 neigh_timer_handler+0xb07/0xdf0 net/core/neighbour.c:999
 call_timer_fn+0x272/0x920 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0x7e5/0xc70 kernel/time/timer.c:1682
 run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1695
 __do_softirq+0x308/0xb7e kernel/softirq.c:292

The buggy address belongs to the object at ffff880192250000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 92 bytes inside of
 512-byte region [ffff880192250000, ffff880192250200)
The buggy address belongs to the page:
page:ffffea0006489400 count:1 mapcount:0 mapping:ffff8801da800940 index:0x0
flags: 0x2fffc0000000200(slab)
raw: 02fffc0000000200 ffffea00076147c8 ffffea0007377448 ffff8801da800940
raw: 0000000000000000 ffff880192250000 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff880192250100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff880192250180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff880192250200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff880192250280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff880192250300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================