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BUG: KASAN: slab-out-of-bounds in scr_memcpyw include/linux/vt_buffer.h:49 [inline]
BUG: KASAN: slab-out-of-bounds in vc_do_resize+0xe3e/0x1ce0 drivers/tty/vt/vt.c:1275
Read of size 4 at addr ffff88809f3d05a0 by task syz-executor.1/13584

CPU: 1 PID: 13584 Comm: syz-executor.1 Not tainted 5.7.0-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:77 [inline]
 dump_stack+0x1e9/0x30e lib/dump_stack.c:118
 print_address_description+0x74/0x5c0 mm/kasan/report.c:382
 __kasan_report+0x103/0x1a0 mm/kasan/report.c:511
 kasan_report+0x4d/0x80 mm/kasan/common.c:625

Allocated by task 13584:
 save_stack mm/kasan/common.c:49 [inline]
 set_track mm/kasan/common.c:57 [inline]
 __kasan_kmalloc+0x114/0x160 mm/kasan/common.c:495
 __do_kmalloc mm/slab.c:3656 [inline]
 __kmalloc+0x24b/0x330 mm/slab.c:3665
 kmalloc include/linux/slab.h:560 [inline]
 kzalloc+0x1d/0x40 include/linux/slab.h:669
 vc_do_resize+0x2a0/0x1ce0 drivers/tty/vt/vt.c:1212
 fbcon_modechanged+0x710/0xd90 drivers/video/fbdev/core/fbcon.c:2989
 fb_set_var+0x822/0xcc0 drivers/video/fbdev/core/fbmem.c:1056
 fbcon_resize+0x7bb/0xff0 drivers/video/fbdev/core/fbcon.c:2231
 resize_screen drivers/tty/vt/vt.c:1151 [inline]
 vc_do_resize+0x70a/0x1ce0 drivers/tty/vt/vt.c:1230
 fbcon_modechanged+0x710/0xd90 drivers/video/fbdev/core/fbcon.c:2989
 fb_set_var+0x822/0xcc0 drivers/video/fbdev/core/fbmem.c:1056
 do_fb_ioctl+0x502/0x6f0 drivers/video/fbdev/core/fbmem.c:1109
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl fs/ioctl.c:763 [inline]
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:770
 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3

Freed by task 350:
 save_stack mm/kasan/common.c:49 [inline]
 set_track mm/kasan/common.c:57 [inline]
 kasan_set_free_info mm/kasan/common.c:317 [inline]
 __kasan_slab_free+0x125/0x190 mm/kasan/common.c:456
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x220 mm/slab.c:3757
 security_cred_free+0xbf/0x100 security/security.c:1599
 put_cred_rcu+0xca/0x350 kernel/cred.c:114
 rcu_do_batch kernel/rcu/tree.c:2206 [inline]
 rcu_core+0x816/0x1120 kernel/rcu/tree.c:2433
 __do_softirq+0x268/0x80c kernel/softirq.c:292

The buggy address belongs to the object at ffff88809f3d0500
 which belongs to the cache kmalloc-192 of size 192
The buggy address is located 160 bytes inside of
 192-byte region [ffff88809f3d0500, ffff88809f3d05c0)
The buggy address belongs to the page:
page:ffffea00027cf400 refcount:1 mapcount:0 mapping:00000000d45ddb02 index:0xffff88809f3d0900
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea000268b508 ffffea0002771d48 ffff8880aa400000
raw: ffff88809f3d0900 ffff88809f3d0000 000000010000000f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809f3d0480: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809f3d0500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88809f3d0580: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
                               ^
 ffff88809f3d0600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809f3d0680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
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