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BUG: KASAN: null-ptr-deref in scr_memcpyw include/linux/vt_buffer.h:49 [inline]
BUG: KASAN: null-ptr-deref in delete_char drivers/tty/vt/vt.c:858 [inline]
BUG: KASAN: null-ptr-deref in csi_P drivers/tty/vt/vt.c:2013 [inline]
BUG: KASAN: null-ptr-deref in do_con_trol drivers/tty/vt/vt.c:2407 [inline]
BUG: KASAN: null-ptr-deref in do_con_write+0x94c2/0xf360 drivers/tty/vt/vt.c:2823
Read of size 4294967294 at addr 0000000000000012 by task syz-executor.0/8507

CPU: 1 PID: 8507 Comm: syz-executor.0 Not tainted 5.8.0-rc5-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+0x202/0x328 lib/dump_stack.c:118
 __kasan_report mm/kasan/report.c:517 [inline]
 kasan_report+0x152/0x1d0 mm/kasan/report.c:530
 check_memory_region_inline mm/kasan/generic.c:183 [inline]
 check_memory_region+0x2b6/0x2f0 mm/kasan/generic.c:192
 memcpy+0x2d/0x70 mm/kasan/common.c:105
 scr_memcpyw include/linux/vt_buffer.h:49 [inline]
 delete_char drivers/tty/vt/vt.c:858 [inline]
 csi_P drivers/tty/vt/vt.c:2013 [inline]
 do_con_trol drivers/tty/vt/vt.c:2407 [inline]
 do_con_write+0x94c2/0xf360 drivers/tty/vt/vt.c:2823
 con_write+0x25/0x40 drivers/tty/vt/vt.c:3159
 process_output_block drivers/tty/n_tty.c:595 [inline]
 n_tty_write+0xd0c/0x1200 drivers/tty/n_tty.c:2333
 do_tty_write drivers/tty/tty_io.c:962 [inline]
 tty_write+0x5a1/0x950 drivers/tty/tty_io.c:1046
 vfs_write+0x2f5/0xcb0 fs/read_write.c:576
 ksys_write+0x11d/0x220 fs/read_write.c:631
 __do_sys_write fs/read_write.c:643 [inline]
 __se_sys_write fs/read_write.c:640 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:640
 do_syscall_64+0x76/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45b439
Code: Bad RIP value.
RSP: 002b:00007f91562bac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f91562bb6d4 RCX: 000000000045b439
RDX: 0000000000000078 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000ca8 R14: 00000000004cd903 R15: 000000000075bf2c
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