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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 9 at addr ffff888085db9bbf by task syz-executor.2/21238

CPU: 1 PID: 21238 Comm: syz-executor.2 Not tainted 4.19.115-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:1372
 hide_cursor+0x85/0x2c0 drivers/tty/vt/vt.c:896
 redraw_screen+0x2ed/0x870 drivers/tty/vt/vt.c:1000
 vc_do_resize+0x108e/0x1380 drivers/tty/vt/vt.c:1311
 vt_ioctl+0x1fa2/0x2500 drivers/tty/vt/vt_ioctl.c:901
 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: 0033:0x45c889
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:00007f2c8cd52c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2c8cd536d4 RCX: 000000000045c889
RDX: 0000000020000040 RSI: 000000000000560a RDI: 0000000000000003
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000066c R14: 00000000004c944e R15: 000000000076bf0c

Allocated by task 17539:
 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]
 kzalloc include/linux/slab.h:709 [inline]
 new_dir fs/proc/proc_sysctl.c:951 [inline]
 get_subdir fs/proc/proc_sysctl.c:996 [inline]
 __register_sysctl_table+0x83f/0xef0 fs/proc/proc_sysctl.c:1339
 __devinet_sysctl_register+0x156/0x280 net/ipv4/devinet.c:2338
 devinet_sysctl_register net/ipv4/devinet.c:2378 [inline]
 devinet_sysctl_register+0x160/0x230 net/ipv4/devinet.c:2368
 inetdev_init+0x227/0x460 net/ipv4/devinet.c:269
 inetdev_event+0xe95/0x1290 net/ipv4/devinet.c:1471
 notifier_call_chain+0xc0/0x230 kernel/notifier.c:93
 call_netdevice_notifiers net/core/dev.c:1766 [inline]
 register_netdevice+0x9b0/0xf50 net/core/dev.c:8740
 macvlan_common_newlink+0xcaf/0x14c0 drivers/net/macvlan.c:1434
 macvtap_newlink drivers/net/macvtap.c:108 [inline]
 macvtap_newlink+0x190/0x260 drivers/net/macvtap.c:80
 rtnl_newlink+0xf03/0x1440 net/core/rtnetlink.c:3141
 rtnetlink_rcv_msg+0x453/0xaf0 net/core/rtnetlink.c:4777
 netlink_rcv_skb+0x160/0x410 net/netlink/af_netlink.c:2455
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x4d7/0x6a0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x80b/0xcd0 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:632
 ___sys_sendmsg+0x803/0x920 net/socket.c:2115
 __sys_sendmsg+0xec/0x1b0 net/socket.c:2153
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 16924:
 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
 kernfs_fop_release+0x124/0x190 fs/kernfs/file.c:783
 __fput+0x2cd/0x890 fs/file_table.c:278
 task_work_run+0x13f/0x1b0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x25a/0x2b0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff888085db9a40
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 383 bytes inside of
 512-byte region [ffff888085db9a40, ffff888085db9c40)
The buggy address belongs to the page:
page:ffffea0002176e40 count:1 mapcount:0 mapping:ffff88812c3dc940 index:0xffff888085db9cc0
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffffea0002554b88 ffffea0002a06188 ffff88812c3dc940
raw: ffff888085db9cc0 ffff888085db9040 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888085db9a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888085db9b00: 00 00 00 00 00 00 00 00 01 fc fc fc fc fc fc fc
>ffff888085db9b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                        ^
 ffff888085db9c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888085db9c80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
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