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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:406 [inline]
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+0x9d8/0x1180 drivers/tty/vt/vt.c:1291
Read of size 2 at addr ffff8880a2efb9a0 by task syz-executor.3/17208
CPU: 1 PID: 17208 Comm: syz-executor.3 Not tainted 5.8.0-rc6-next-20200724-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+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 check_memory_region_inline mm/kasan/generic.c:186 [inline]
 check_memory_region+0x13d/0x180 mm/kasan/generic.c:192
 memcpy+0x20/0x60 mm/kasan/common.c:105
 memcpy include/linux/string.h:406 [inline]
 scr_memcpyw include/linux/vt_buffer.h:49 [inline]
 vc_do_resize+0x9d8/0x1180 drivers/tty/vt/vt.c:1291
 fbcon_modechanged+0x36c/0x710 drivers/video/fbdev/core/fbcon.c:2990
 fbcon_set_all_vcs+0x3b6/0x470 drivers/video/fbdev/core/fbcon.c:3039
 fbcon_update_vcs+0x26/0x50 drivers/video/fbdev/core/fbcon.c:3046
 fb_set_var+0xae8/0xd60 drivers/video/fbdev/core/fbmem.c:1056
 do_fb_ioctl+0x33f/0x6c0 drivers/video/fbdev/core/fbmem.c:1109
 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1185
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c369
Code: Bad RIP value.
RSP: 002b:00007f560e630c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000d540 RCX: 000000000045c369
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffc7fbe113f R14: 00007f560e6319c0 R15: 000000000078bf0c
Allocated by task 17208:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 __do_kmalloc mm/slab.c:3655 [inline]
 __kmalloc+0x1a8/0x320 mm/slab.c:3664
 kmalloc include/linux/slab.h:559 [inline]
 kzalloc include/linux/slab.h:666 [inline]
 vc_do_resize+0x2f6/0x1180 drivers/tty/vt/vt.c:1228
 fbcon_modechanged+0x36c/0x710 drivers/video/fbdev/core/fbcon.c:2990
 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3048
 fb_set_var+0xae8/0xd60 drivers/video/fbdev/core/fbmem.c:1056
 fbcon_resize+0x575/0x610 drivers/video/fbdev/core/fbcon.c:2231
 resize_screen drivers/tty/vt/vt.c:1175 [inline]
 vc_do_resize+0x535/0x1180 drivers/tty/vt/vt.c:1246
 fbcon_modechanged+0x36c/0x710 drivers/video/fbdev/core/fbcon.c:2990
 fbcon_set_all_vcs+0x3b6/0x470 drivers/video/fbdev/core/fbcon.c:3039
 fbcon_update_vcs+0x26/0x50 drivers/video/fbdev/core/fbcon.c:3046
 fb_set_var+0xae8/0xd60 drivers/video/fbdev/core/fbmem.c:1056
 do_fb_ioctl+0x33f/0x6c0 drivers/video/fbdev/core/fbmem.c:1109
 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1185
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
The buggy address belongs to the object at ffff8880a2efb900
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 32 bytes to the right of
 128-byte region [ffff8880a2efb900, ffff8880a2efb980)
The buggy address belongs to the page:
page:000000006ce612d2 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa2efb
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea000267d688 ffffea00027af888 ffff8880aa000400
raw: 0000000000000000 ffff8880a2efb000 0000000100000010 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
 ffff8880a2efb880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a2efb900: 00 00 00 00 00 00 00 00 00 00 00 00 04 fc fc fc
>ffff8880a2efb980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                               ^
 ffff8880a2efba00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a2efba80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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