protocol 86dd is buggy, dev sit0
protocol 86dd is buggy, dev sit0
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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:3435 [inline]
BUG: KASAN: slab-out-of-bounds in __pskb_copy_fclone+0x2dd/0xeb0 net/core/skbuff.c:1395
Read of size 4294967282 at addr ffff88819823c81c by task syz-executor4/19744

CPU: 1 PID: 19744 Comm: syz-executor4 Not tainted 4.20.0-rc4+ #164
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
 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:3435 [inline]
 __pskb_copy_fclone+0x2dd/0xeb0 net/core/skbuff.c:1395
 __pskb_copy include/linux/skbuff.h:1061 [inline]
 pskb_copy include/linux/skbuff.h:2919 [inline]
 skb_realloc_headroom+0xe7/0x120 net/core/skbuff.c:1539
 ipip6_tunnel_xmit net/ipv6/sit.c:965 [inline]
 sit_tunnel_xmit+0xe1b/0x30e0 net/ipv6/sit.c:1029
 __netdev_start_xmit include/linux/netdevice.h:4365 [inline]
 netdev_start_xmit include/linux/netdevice.h:4374 [inline]
 xmit_one net/core/dev.c:3259 [inline]
 dev_hard_start_xmit+0x295/0xc80 net/core/dev.c:3275
 __dev_queue_xmit+0x2f7a/0x3ae0 net/core/dev.c:3845
 dev_queue_xmit+0x17/0x20 net/core/dev.c:3878
 __bpf_tx_skb net/core/filter.c:2014 [inline]
 __bpf_redirect_common net/core/filter.c:2052 [inline]
 __bpf_redirect+0x5df/0xb60 net/core/filter.c:2059
 ____bpf_clone_redirect net/core/filter.c:2092 [inline]
 bpf_clone_redirect+0x2f6/0x490 net/core/filter.c:2064
 bpf_prog_41f2bcae09cd4ac3+0xac2/0x1000

Allocated by task 19744:
 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:5100
 __bpf_try_make_writable net/core/filter.c:1635 [inline]
 bpf_try_make_writable net/core/filter.c:1641 [inline]
 bpf_try_make_head_writable net/core/filter.c:1649 [inline]
 ____bpf_clone_redirect net/core/filter.c:2086 [inline]
 bpf_clone_redirect+0x14a/0x490 net/core/filter.c:2064
 bpf_prog_41f2bcae09cd4ac3+0xac2/0x1000

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff88819823c7c0
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 92 bytes inside of
 512-byte region [ffff88819823c7c0, ffff88819823c9c0)
The buggy address belongs to the page:
page:ffffea0006608f00 count:1 mapcount:0 mapping:ffff8881da800940 index:0x0
flags: 0x2fffc0000000200(slab)
raw: 02fffc0000000200 ffffea00075f5a88 ffffea00074d65c8 ffff8881da800940
raw: 0000000000000000 ffff88819823c040 0000000100000006 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88819823c880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88819823c900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88819823c980: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff88819823ca00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff88819823ca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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