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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+0xb5e/0x1af0 drivers/tty/vt/vt.c:1250
Read of size 4 at addr ffff88809987903c by task syz-executor.0/27896

CPU: 1 PID: 27896 Comm: syz-executor.0 Not tainted 5.5.0-rc7-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+0x1fb/0x318 lib/dump_stack.c:118
 print_address_description+0x74/0x5c0 mm/kasan/report.c:374
 __kasan_report+0x149/0x1c0 mm/kasan/report.c:506
 kasan_report+0x26/0x50 mm/kasan/common.c:639
 check_memory_region_inline mm/kasan/generic.c:182 [inline]
 check_memory_region+0x2b6/0x2f0 mm/kasan/generic.c:192
 memcpy+0x28/0x60 mm/kasan/common.c:125
 scr_memcpyw include/linux/vt_buffer.h:49 [inline]
 vc_do_resize+0xb5e/0x1af0 drivers/tty/vt/vt.c:1250
 vc_resize+0x4f/0x60 drivers/tty/vt/vt.c:1304
 fbcon_modechanged+0x701/0xdf0 drivers/video/fbdev/core/fbcon.c:2980
 fbcon_update_vcs+0x31/0x40 drivers/video/fbdev/core/fbcon.c:3038
 fb_set_var+0x8f5/0xdc0 drivers/video/fbdev/core/fbmem.c:1051
 do_fb_ioctl+0x55e/0x780 drivers/video/fbdev/core/fbmem.c:1104
 fb_ioctl+0xb9/0xf0 drivers/video/fbdev/core/fbmem.c:1180
 do_vfs_ioctl+0x6e2/0x19b0 fs/ioctl.c:47
 ksys_ioctl fs/ioctl.c:749 [inline]
 __do_sys_ioctl fs/ioctl.c:756 [inline]
 __se_sys_ioctl fs/ioctl.c:754 [inline]
 __x64_sys_ioctl+0xe3/0x120 fs/ioctl.c:754
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45b349
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:00007f085d271c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f085d2726d4 RCX: 000000000045b349
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000002cd R14: 00000000004c3dc6 R15: 000000000075bf2c

Allocated by task 27896:
 save_stack mm/kasan/common.c:72 [inline]
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc+0x118/0x1c0 mm/kasan/common.c:513
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527
 __do_kmalloc mm/slab.c:3656 [inline]
 __kmalloc+0x254/0x340 mm/slab.c:3665
 kmalloc include/linux/slab.h:561 [inline]
 kzalloc+0x21/0x40 include/linux/slab.h:670
 vc_do_resize+0x2af/0x1af0 drivers/tty/vt/vt.c:1187
 vc_resize+0x4f/0x60 drivers/tty/vt/vt.c:1304
 fbcon_modechanged+0x701/0xdf0 drivers/video/fbdev/core/fbcon.c:2980
 fbcon_update_vcs+0x31/0x40 drivers/video/fbdev/core/fbcon.c:3038
 fb_set_var+0x8f5/0xdc0 drivers/video/fbdev/core/fbmem.c:1051
 fbcon_resize+0x819/0x11f0 drivers/video/fbdev/core/fbcon.c:2222
 resize_screen drivers/tty/vt/vt.c:1126 [inline]
 vc_do_resize+0x478/0x1af0 drivers/tty/vt/vt.c:1205
 vc_resize+0x4f/0x60 drivers/tty/vt/vt.c:1304
 fbcon_modechanged+0x701/0xdf0 drivers/video/fbdev/core/fbcon.c:2980
 fbcon_update_vcs+0x31/0x40 drivers/video/fbdev/core/fbcon.c:3038
 fb_set_var+0x8f5/0xdc0 drivers/video/fbdev/core/fbmem.c:1051
 do_fb_ioctl+0x55e/0x780 drivers/video/fbdev/core/fbmem.c:1104
 fb_ioctl+0xb9/0xf0 drivers/video/fbdev/core/fbmem.c:1180
 do_vfs_ioctl+0x6e2/0x19b0 fs/ioctl.c:47
 ksys_ioctl fs/ioctl.c:749 [inline]
 __do_sys_ioctl fs/ioctl.c:756 [inline]
 __se_sys_ioctl fs/ioctl.c:754 [inline]
 __x64_sys_ioctl+0xe3/0x120 fs/ioctl.c:754
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 26062:
 save_stack mm/kasan/common.c:72 [inline]
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:335 [inline]
 __kasan_slab_free+0x12e/0x1e0 mm/kasan/common.c:474
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10d/0x220 mm/slab.c:3757
 tomoyo_path_perm+0x66a/0x850 security/tomoyo/file.c:840
 tomoyo_path_symlink+0x95/0xc0 security/tomoyo/tomoyo.c:206
 security_path_symlink+0xe8/0x170 security/security.c:1053
 do_symlinkat+0xee/0x3f0 fs/namei.c:4092
 __do_sys_symlink fs/namei.c:4113 [inline]
 __se_sys_symlink fs/namei.c:4111 [inline]
 __x64_sys_symlink+0x60/0x70 fs/namei.c:4111
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff888099879000
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 60 bytes inside of
 64-byte region [ffff888099879000, ffff888099879040)
The buggy address belongs to the page:
page:ffffea0002661e40 refcount:1 mapcount:0 mapping:ffff8880aa800380 index:0xffff888099879800
raw: 00fffe0000000200 ffffea00025deec8 ffffea00025959c8 ffff8880aa800380
raw: ffff888099879800 ffff888099879000 0000000100000019 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888099878f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888099878f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888099879000: 00 00 00 00 00 00 00 04 fc fc fc fc fc fc fc fc
                                        ^
 ffff888099879080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888099879100: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
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