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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:1280
Read of size 30 at addr ffff8880558352c0 by task syz-executor.3/31277

CPU: 0 PID: 31277 Comm: syz-executor.3 Not tainted 5.8.0-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+0x1f0/0x31e lib/dump_stack.c:118
 print_address_description+0x66/0x5a0 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report+0x132/0x1d0 mm/kasan/report.c:530
 check_memory_region_inline mm/kasan/generic.c:183 [inline]
 check_memory_region+0x2b5/0x2f0 mm/kasan/generic.c:192
 memcpy+0x25/0x60 mm/kasan/common.c:105
 scr_memcpyw include/linux/vt_buffer.h:49 [inline]
 vc_do_resize+0xe3e/0x1ce0 drivers/tty/vt/vt.c:1280
 fbcon_modechanged+0x710/0xd90 drivers/video/fbdev/core/fbcon.c:2990
 fb_set_var+0x825/0xcc0 drivers/video/fbdev/core/fbmem.c:1056
 do_fb_ioctl+0x502/0x6f0 drivers/video/fbdev/core/fbmem.c:1109
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl fs/ioctl.c:753 [inline]
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:760
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007f72b746bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e55e0 RCX: 000000000045cb29
RDX: 0000000020000080 RSI: 0000000000004601 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000002fd R14: 00000000004c58a5 R15: 00007f72b746c6d4

Allocated by task 31277:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494
 __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:1217
 fbcon_modechanged+0x710/0xd90 drivers/video/fbdev/core/fbcon.c:2990
 fb_set_var+0x825/0xcc0 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:1156 [inline]
 vc_do_resize+0x70a/0x1ce0 drivers/tty/vt/vt.c:1235
 fbcon_modechanged+0x710/0xd90 drivers/video/fbdev/core/fbcon.c:2990
 fb_set_var+0x825/0xcc0 drivers/video/fbdev/core/fbmem.c:1056
 do_fb_ioctl+0x502/0x6f0 drivers/video/fbdev/core/fbmem.c:1109
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl fs/ioctl.c:753 [inline]
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:760
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 29756:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x220 mm/slab.c:3757
 vc_do_resize+0xf63/0x1ce0 drivers/tty/vt/vt.c:1291
 fbcon_modechanged+0x710/0xd90 drivers/video/fbdev/core/fbcon.c:2990
 fb_set_var+0x825/0xcc0 drivers/video/fbdev/core/fbmem.c:1056
 do_fb_ioctl+0x502/0x6f0 drivers/video/fbdev/core/fbmem.c:1109
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl fs/ioctl.c:753 [inline]
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:760
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888055834000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 4800 bytes inside of
 8192-byte region [ffff888055834000, ffff888055836000)
The buggy address belongs to the page:
page:ffffea0001560d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea0001560d00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfffe0000010200(slab|head)
raw: 00fffe0000010200 ffffea0001500708 ffffea000156bb08 ffff8880aa4021c0
raw: 0000000000000000 ffff888055834000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888055835180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888055835200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888055835280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff888055835300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888055835380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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