syzbot

netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
==================================================================
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 3560 at addr ffff88801b8e1ce4 by task syz-executor927/8481

CPU: 1 PID: 8481 Comm: syz-executor927 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]
 validate_xmit_skb+0x69e/0xee0 net/core/dev.c:3644
 validate_xmit_skb_list+0xbc/0x120 net/core/dev.c:3694
 sch_direct_xmit+0x3f8/0xbd0 net/sched/sch_generic.c:298
 qdisc_restart net/sched/sch_generic.c:376 [inline]
 __qdisc_run+0x4ba/0x15f0 net/sched/sch_generic.c:384
 qdisc_run include/net/pkt_sched.h:136 [inline]
 qdisc_run include/net/pkt_sched.h:128 [inline]
 __dev_xmit_skb net/core/dev.c:3765 [inline]
 __dev_queue_xmit+0x1489/0x2dd0 net/core/dev.c:4119
 packet_snd net/packet/af_packet.c:3006 [inline]
 packet_sendmsg+0x2406/0x52a0 net/packet/af_packet.c:3031
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x443679
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 eb 0d fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffde7f61228 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443679
RDX: 0000000000034000 RSI: 0000000020000440 RDI: 0000000000000003
RBP: 00007ffde7f61230 R08: 0000000001bbbbbb R09: 0000000001bbbbbb
R10: 0000000000000004 R11: 0000000000000246 R12: 00007ffde7f61240
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 8481:
 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 include/linux/skbuff.h:1100 [inline]
 alloc_skb_with_frags+0x93/0x5d0 net/core/skbuff.c:5888
 sock_alloc_send_pskb+0x793/0x920 net/core/sock.c:2348
 packet_alloc_skb net/packet/af_packet.c:2854 [inline]
 packet_snd net/packet/af_packet.c:2949 [inline]
 packet_sendmsg+0x19ee/0x52a0 net/packet/af_packet.c:3031
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432
 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 ffff88801b8e0000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 7396 bytes inside of
 8192-byte region [ffff88801b8e0000, ffff88801b8e2000)
The buggy address belongs to the page:
page:000000007b35f0ce refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1b8e0
head:000000007b35f0ce order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010042280
raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88801b8e1f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801b8e1f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88801b8e2000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88801b8e2080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801b8e2100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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