SELinux: failed to load policy
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'.
==================================================================
BUG: KASAN: use-after-free in fbcon_cursor+0x686/0x7b0 drivers/video/fbdev/core/fbcon.c:1347
Read of size 2 at addr ffff8880a9b6e342 by task syz-executor.4/29124

CPU: 1 PID: 29124 Comm: syz-executor.4 Not tainted 4.19.102-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+0x197/0x210 lib/dump_stack.c:118
 print_address_description.cold+0x7c/0x20d 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+0x8c/0x2ba mm/kasan/report.c:396
 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:431
 fbcon_cursor+0x686/0x7b0 drivers/video/fbdev/core/fbcon.c:1347
 fbcon_scrolldelta+0x675/0x1330 drivers/video/fbdev/core/fbcon.c:2855
 fbcon_set_origin+0x43/0x50 drivers/video/fbdev/core/fbcon.c:2906
 set_origin+0x341/0x440 drivers/tty/vt/vt.c:919
 vc_do_resize+0xacc/0x14a0 drivers/tty/vt/vt.c:1267
 vc_resize+0x4d/0x60 drivers/tty/vt/vt.c:1307
 vt_ioctl+0x1fe0/0x2530 drivers/tty/vt/vt_ioctl.c:887
 tty_ioctl+0x7f3/0x1510 drivers/tty/tty_io.c:2669
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:688
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45b3b9
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:00007fe58d8bfc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe58d8c06d4 RCX: 000000000045b3b9
RDX: 0000000020000200 RSI: 000000000000560a RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000666 R14: 00000000004c7f1a R15: 000000000075bf2c

Allocated by task 32131:
 save_stack+0x45/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc mm/kasan/kasan.c:553 [inline]
 kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15d/0x750 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 kzalloc include/linux/slab.h:709 [inline]
 vc_do_resize+0x262/0x14a0 drivers/tty/vt/vt.c:1190
 vc_resize+0x4d/0x60 drivers/tty/vt/vt.c:1307
 vt_ioctl+0x1fe0/0x2530 drivers/tty/vt/vt_ioctl.c:887
 tty_ioctl+0x7f3/0x1510 drivers/tty/tty_io.c:2669
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:688
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 29124:
 save_stack+0x45/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcf/0x220 mm/slab.c:3822
 vc_do_resize+0xa69/0x14a0 drivers/tty/vt/vt.c:1264
 vc_resize+0x4d/0x60 drivers/tty/vt/vt.c:1307
 vt_ioctl+0x1fe0/0x2530 drivers/tty/vt/vt_ioctl.c:887
 tty_ioctl+0x7f3/0x1510 drivers/tty/tty_io.c:2669
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:688
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a9b6e340
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 2 bytes inside of
 512-byte region [ffff8880a9b6e340, ffff8880a9b6e540)
The buggy address belongs to the page:
page:ffffea0002a6db80 count:1 mapcount:0 mapping:ffff88812c31c940 index:0xffff8880a9b6eac0
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffffea0001628bc8 ffffea000215c248 ffff88812c31c940
raw: ffff8880a9b6eac0 ffff8880a9b6e0c0 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a9b6e200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a9b6e280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8880a9b6e300: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                           ^
 ffff8880a9b6e380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a9b6e400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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