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BUG: KASAN: slab-out-of-bounds in fbcon_get_font+0x1de/0x910 drivers/video/fbdev/core/fbcon.c:2474
Read of size 16 at addr ffff88809f147910 by task syz-executor.0/20340

CPU: 1 PID: 20340 Comm: syz-executor.0 Not tainted 5.7.0-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+0x1e9/0x30e 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
 fbcon_get_font+0x1de/0x910 drivers/video/fbdev/core/fbcon.c:2474
 con_font_get drivers/tty/vt/vt.c:4479 [inline]
 con_font_op+0x664/0x1630 drivers/tty/vt/vt.c:4638
 vt_ioctl+0x24a3/0x3eb0 drivers/tty/vt/vt_ioctl.c:980
 tty_ioctl+0xee4/0x15c0 drivers/tty/tty_io.c:2656
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl fs/ioctl.c:771 [inline]
 __do_sys_ioctl fs/ioctl.c:780 [inline]
 __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:778
 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45ca69
Code: 0d b7 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f44ff7bdc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e6d20 RCX: 000000000045ca69
RDX: 0000000020000080 RSI: 0000000000004b72 RDI: 0000000000000003
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000373 R14: 00000000004c6089 R15: 00007f44ff7be6d4

Allocated by task 17605:
 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]
 fbcon_set_font+0x2c4/0x970 drivers/video/fbdev/core/fbcon.c:2672
 con_font_set drivers/tty/vt/vt.c:4571 [inline]
 con_font_op+0xebc/0x1630 drivers/tty/vt/vt.c:4636
 vt_ioctl+0x179d/0x3eb0 drivers/tty/vt/vt_ioctl.c:265
 tty_ioctl+0xee4/0x15c0 drivers/tty/tty_io.c:2656
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl fs/ioctl.c:771 [inline]
 __do_sys_ioctl fs/ioctl.c:780 [inline]
 __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:778
 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3

Freed by task 17222:
 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
 __vunmap+0x973/0xa20 mm/vmalloc.c:2307
 netlink_skb_destructor+0x91/0x1e0 net/netlink/af_netlink.c:366
 skb_release_head_state+0xfb/0x210 net/core/skbuff.c:651
 skb_release_all net/core/skbuff.c:662 [inline]
 __kfree_skb+0x22/0x1c0 net/core/skbuff.c:678
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x78e/0x940 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0xa57/0xd70 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x519/0x800 net/socket.c:2352
 ___sys_sendmsg net/socket.c:2406 [inline]
 __sys_sendmsg+0x2b1/0x360 net/socket.c:2439
 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3

The buggy address belongs to the object at ffff88809f147800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 272 bytes inside of
 512-byte region [ffff88809f147800, ffff88809f147a00)
The buggy address belongs to the page:
page:ffffea00027c51c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88809f147000
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00024afe08 ffffea000268e808 ffff8880aa400a80
raw: ffff88809f147000 ffff88809f147000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809f147800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88809f147880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88809f147900: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                         ^
 ffff88809f147980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809f147a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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