xt_l2tp: v2 tid > 0xffff: 131072
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:348 [inline]
BUG: KASAN: slab-out-of-bounds in soft_cursor+0x448/0xa20 drivers/video/fbdev/core/softcursor.c:70
Read of size 16 at addr ffff88804971bd10 by task syz-executor.0/7586

CPU: 1 PID: 7586 Comm: syz-executor.0 Not tainted 4.19.110-syzkaller #0
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+0x188/0x20d lib/dump_stack.c:118
 print_address_description.cold+0x7c/0x212 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report mm/kasan/report.c:412 [inline]
 kasan_report.cold+0x88/0x2b9 mm/kasan/report.c:396
 memcpy+0x20/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:348 [inline]
 soft_cursor+0x448/0xa20 drivers/video/fbdev/core/softcursor.c:70
 bit_cursor+0x1230/0x1900 drivers/video/fbdev/core/bitblit.c:386
 fbcon_cursor+0x572/0x760 drivers/video/fbdev/core/fbcon.c:1369
 hide_cursor+0x99/0x2f0 drivers/tty/vt/vt.c:895
 redraw_screen+0x2ed/0x870 drivers/tty/vt/vt.c:999
 fbcon_do_set_font+0x727/0xa30 drivers/video/fbdev/core/fbcon.c:2583
 fbcon_copy_font+0x125/0x190 drivers/video/fbdev/core/fbcon.c:2598
 con_font_copy drivers/tty/vt/vt.c:4557 [inline]
 con_font_op+0x63f/0x1130 drivers/tty/vt/vt.c:4572
 vt_ioctl+0x1615/0x2310 drivers/tty/vt/vt_ioctl.c:970
 tty_ioctl+0x7a1/0x1420 drivers/tty/tty_io.c:2669
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c849
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fb658e40c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb658e416d4 RCX: 000000000045c849
RDX: 0000000020000180 RSI: 0000000000004b72 RDI: 0000000000000003
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000036b R14: 00000000004c5dc7 R15: 000000000076bf0c

Allocated by task 9935:
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc mm/kasan/kasan.c:553 [inline]
 kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:531
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15b/0x770 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 fbcon_set_font+0x331/0x870 drivers/video/fbdev/core/fbcon.c:2641
 con_font_set drivers/tty/vt/vt.c:4501 [inline]
 con_font_op+0xd3e/0x1130 drivers/tty/vt/vt.c:4566
 vt_ioctl+0xc6c/0x2310 drivers/tty/vt/vt_ioctl.c:918
 tty_ioctl+0x7a1/0x1420 drivers/tty/tty_io.c:2669
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 11654:
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0xf7/0x140 mm/kasan/kasan.c:521
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xce/0x220 mm/slab.c:3822
 skb_free_head+0x91/0xb0 net/core/skbuff.c:554
 skb_release_data+0x600/0x8c0 net/core/skbuff.c:574
 skb_release_all+0x46/0x60 net/core/skbuff.c:631
 __kfree_skb net/core/skbuff.c:645 [inline]
 consume_skb net/core/skbuff.c:705 [inline]
 consume_skb+0xda/0x380 net/core/skbuff.c:699
 skb_free_datagram+0x16/0xf0 net/core/datagram.c:329
 netlink_recvmsg+0x667/0xea0 net/netlink/af_netlink.c:1988
 sock_recvmsg_nosec net/socket.c:795 [inline]
 sock_recvmsg net/socket.c:802 [inline]
 sock_recvmsg+0xca/0x110 net/socket.c:798
 ___sys_recvmsg+0x271/0x580 net/socket.c:2277
 __sys_recvmsg+0xe9/0x1b0 net/socket.c:2326
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88804971bb00
 which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 528 bytes inside of
 1024-byte region [ffff88804971bb00, ffff88804971bf00)
The buggy address belongs to the page:
page:ffffea000125c680 count:1 mapcount:0 mapping:ffff88812c3dcac0 index:0xffff88804971b680 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffffea000278ec08 ffffea0002a36e88 ffff88812c3dcac0
raw: ffff88804971b680 ffff88804971a000 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88804971bc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804971bc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88804971bd00: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                         ^
 ffff88804971bd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88804971be00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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