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BUG: KASAN: use-after-free in scr_memcpyw include/linux/vt_buffer.h:49 [inline]
BUG: KASAN: use-after-free in vc_do_resize+0xe2e/0x1d00 drivers/tty/vt/vt.c:1286
Read of size 2 at addr ffff8880a68d4182 by task syz-executor.0/7096

CPU: 0 PID: 7096 Comm: syz-executor.0 Not tainted 5.8.0-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+0xe2e/0x1d00 drivers/tty/vt/vt.c:1286
 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:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cce9
Code: 2d 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4d4b387c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000d540 RCX: 000000000045cce9
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffe2502b86f R14: 00007f4d4b3889c0 R15: 000000000078bf0c

Allocated by task 1:
 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 include/linux/slab.h:669 [inline]
 tomoyo_encode2+0x25a/0x560 security/tomoyo/realpath.c:45
 tomoyo_encode security/tomoyo/realpath.c:80 [inline]
 tomoyo_realpath_from_path+0x5d6/0x630 security/tomoyo/realpath.c:288
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x17d/0x740 security/tomoyo/file.c:822
 security_inode_getattr+0xc0/0x140 security/security.c:1278
 vfs_getattr fs/stat.c:121 [inline]
 vfs_statx+0x118/0x380 fs/stat.c:206
 vfs_lstat include/linux/fs.h:3302 [inline]
 __do_sys_newlstat fs/stat.c:374 [inline]
 __se_sys_newlstat fs/stat.c:368 [inline]
 __x64_sys_newlstat+0x81/0xd0 fs/stat.c:368
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 1:
 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
 tomoyo_path_perm+0x59b/0x740 security/tomoyo/file.c:842
 security_inode_getattr+0xc0/0x140 security/security.c:1278
 vfs_getattr fs/stat.c:121 [inline]
 vfs_statx+0x118/0x380 fs/stat.c:206
 vfs_lstat include/linux/fs.h:3302 [inline]
 __do_sys_newlstat fs/stat.c:374 [inline]
 __se_sys_newlstat fs/stat.c:368 [inline]
 __x64_sys_newlstat+0x81/0xd0 fs/stat.c:368
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff8880a68d4180
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 2 bytes inside of
 32-byte region [ffff8880a68d4180, ffff8880a68d41a0)
The buggy address belongs to the page:
page:ffffea00029a3500 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a68d4fc1
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00027b9488 ffffea00024ebc08 ffff8880aa4001c0
raw: ffff8880a68d4fc1 ffff8880a68d4000 000000010000003f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a68d4080: 00 00 01 fc fc fc fc fc 00 04 fc fc fc fc fc fc
 ffff8880a68d4100: 00 04 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8880a68d4180: fb fb fb fb fc fc fc fc 00 00 01 fc fc fc fc fc
                   ^
 ffff8880a68d4200: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a68d4280: 00 00 01 fc fc fc fc fc 00 00 00 fc fc fc fc fc
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