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BUG: KASAN: slab-out-of-bounds in erspan_xmit+0x22d4/0x2430 net/ipv4/ip_gre.c:735
Read of size 2 at addr ffff8801d435448b by task syz-executor3/26479

CPU: 1 PID: 26479 Comm: syz-executor3 Not tainted 4.15.0-rc9+ #206
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:440
 erspan_xmit+0x22d4/0x2430 net/ipv4/ip_gre.c:735
 __netdev_start_xmit include/linux/netdevice.h:4055 [inline]
 netdev_start_xmit include/linux/netdevice.h:4064 [inline]
 packet_direct_xmit+0x3ad/0x790 net/packet/af_packet.c:267
 packet_snd net/packet/af_packet.c:2944 [inline]
 packet_sendmsg+0x3aed/0x60b0 net/packet/af_packet.c:2969
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:640
 SYSC_sendto+0x361/0x5c0 net/socket.c:1721
 SyS_sendto+0x40/0x50 net/socket.c:1689
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452f19
RSP: 002b:00007f05324bfc58 EFLAGS: 00000212 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452f19
RDX: 0000000000000022 RSI: 0000000020011fde RDI: 0000000000000013
RBP: 00000000000003d6 R08: 0000000020010000 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4cb0
R13: 00000000ffffffff R14: 00007f05324c06d4 R15: 0000000000000000

Allocated by task 10703:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
 __do_kmalloc mm/slab.c:3708 [inline]
 __kmalloc_track_caller+0x15e/0x760 mm/slab.c:3723
 kstrdup+0x39/0x70 mm/util.c:56
 kstrdup_const+0x39/0x50 mm/util.c:77
 __kernfs_new_node+0xa2/0x570 fs/kernfs/dir.c:629
 kernfs_new_node+0x80/0xe0 fs/kernfs/dir.c:679
 kernfs_create_dir_ns+0x41/0x140 fs/kernfs/dir.c:1000
 sysfs_create_dir_ns+0xbe/0x1d0 fs/sysfs/dir.c:55
 create_dir lib/kobject.c:71 [inline]
 kobject_add_internal+0x335/0xbc0 lib/kobject.c:229
 kobject_add_varg lib/kobject.c:366 [inline]
 kobject_init_and_add+0xf9/0x150 lib/kobject.c:438
 netdev_queue_add_kobject net/core/net-sysfs.c:1355 [inline]
 netdev_queue_update_kobjects+0x148/0x480 net/core/net-sysfs.c:1383
 register_queue_kobjects net/core/net-sysfs.c:1425 [inline]
 netdev_register_kobject+0x2bd/0x360 net/core/net-sysfs.c:1631
 register_netdevice+0xb41/0x1020 net/core/dev.c:7852
 register_netdev+0x1a/0x30 net/core/dev.c:7966
 br_add_bridge+0x97/0xd0 net/bridge/br_if.c:394
 old_deviceless net/bridge/br_ioctl.c:349 [inline]
 br_ioctl_deviceless_stub+0x8fe/0xa00 net/bridge/br_ioctl.c:363
 sock_ioctl+0x383/0x440 net/socket.c:1022
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 entry_SYSCALL_64_fastpath+0x29/0xa0

Freed by task 6560:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3488 [inline]
 kfree+0xd6/0x260 mm/slab.c:3803
 selinux_cred_free+0x48/0x70 security/selinux/hooks.c:3814
 security_cred_free+0x48/0x80 security/security.c:995
 put_cred_rcu+0x106/0x400 kernel/cred.c:117
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2758 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:3012 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2979 [inline]
 rcu_process_callbacks+0xd6c/0x17f0 kernel/rcu/tree.c:2996
 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285

The buggy address belongs to the object at ffff8801d4354480
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 11 bytes inside of
 32-byte region [ffff8801d4354480, ffff8801d43544a0)
The buggy address belongs to the page:
page:ffffea000750d500 count:1 mapcount:0 mapping:ffff8801d4354000 index:0xffff8801d4354fc1
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801d4354000 ffff8801d4354fc1 000000010000003f
raw: ffffea00071f3620 ffffea00071fe5a0 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d4354380: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801d4354400: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8801d4354480: 05 fc fc fc fc fc fc fc 00 fc fc fc fc fc fc fc
                      ^
 ffff8801d4354500: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8801d4354580: 00 00 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
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