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BUG: KASAN: slab-out-of-bounds in soft_cursor+0x3fe/0xdb0 drivers/video/fbdev/core/softcursor.c:70
Read of size 16 at addr ffff88804c1c67a0 by task syz-executor.3/32117

CPU: 1 PID: 32117 Comm: syz-executor.3 Not tainted 5.9.0-rc2-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+0x66/0x620 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
 soft_cursor+0x3fe/0xdb0 drivers/video/fbdev/core/softcursor.c:70
 bit_cursor+0x178a/0x2180 drivers/video/fbdev/core/bitblit.c:386
 hide_cursor+0x7e/0x310 drivers/tty/vt/vt.c:906
 redraw_screen+0x154/0x1420 drivers/tty/vt/vt.c:1011
 vc_do_resize+0x11ab/0x1790 drivers/tty/vt/vt.c:1325
 vt_resizex drivers/tty/vt/vt_ioctl.c:814 [inline]
 vt_ioctl+0x3032/0x3c60 drivers/tty/vt/vt_ioctl.c:1026
 tty_ioctl+0xee4/0x15c0 drivers/tty/tty_io.c:2656
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d579
Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f48c51e8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000001cfc0 RCX: 000000000045d579
RDX: 0000000020000000 RSI: 000000000000560a RDI: 0000000000000003
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffc25cb5f0f R14: 00007f48c51e99c0 R15: 000000000118cf4c

Allocated by task 30613:
 kasan_save_stack mm/kasan/common.c:48 [inline]
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc+0x100/0x130 mm/kasan/common.c:461
 __do_kmalloc mm/slab.c:3655 [inline]
 __kmalloc+0x218/0x320 mm/slab.c:3664
 kmalloc include/linux/slab.h:559 [inline]
 fbcon_set_font+0x2c4/0x970 drivers/video/fbdev/core/fbcon.c:2673
 con_font_set drivers/tty/vt/vt.c:4662 [inline]
 con_font_op+0xebc/0x1630 drivers/tty/vt/vt.c:4727
 vt_io_ioctl drivers/tty/vt/vt_ioctl.c:506 [inline]
 vt_ioctl+0xd7f/0x3c60 drivers/tty/vt/vt_ioctl.c:846
 tty_ioctl+0xee4/0x15c0 drivers/tty/tty_io.c:2656
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Last call_rcu():
 kasan_save_stack+0x27/0x50 mm/kasan/common.c:48
 kasan_record_aux_stack+0x7b/0xb0 mm/kasan/generic.c:346
 __call_rcu kernel/rcu/tree.c:2894 [inline]
 call_rcu+0x139/0x840 kernel/rcu/tree.c:2968
 netlink_release+0x1295/0x1620 net/netlink/af_netlink.c:802
 __sock_release net/socket.c:596 [inline]
 sock_close+0xd8/0x260 net/socket.c:1277
 __fput+0x34f/0x7b0 fs/file_table.c:281
 task_work_run+0x137/0x1c0 kernel/task_work.c:141
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:140 [inline]
 exit_to_user_mode_prepare+0xfa/0x1b0 kernel/entry/common.c:167
 syscall_exit_to_user_mode+0x5e/0x1a0 kernel/entry/common.c:242
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff88804c1c6000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1952 bytes inside of
 2048-byte region [ffff88804c1c6000, ffff88804c1c6800)
The buggy address belongs to the page:
page:0000000009a61ee9 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4c1c6
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0000f9a4c8 ffffea000243b5c8 ffff8880aa440800
raw: 0000000000000000 ffff88804c1c6000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88804c1c6680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804c1c6700: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88804c1c6780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                               ^
 ffff88804c1c6800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88804c1c6880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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