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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:381 [inline]
BUG: KASAN: slab-out-of-bounds in fbcon_get_font+0x28d/0x5b0 drivers/video/fbdev/core/fbcon.c:2474
Read of size 8 at addr ffff888028720510 by task syz-executor.0/19067

CPU: 3 PID: 19067 Comm: syz-executor.0 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:382
 __kasan_report.cold+0x35/0x4d mm/kasan/report.c:511
 kasan_report+0x33/0x50 mm/kasan/common.c:625
 check_memory_region_inline mm/kasan/generic.c:187 [inline]
 check_memory_region+0x141/0x190 mm/kasan/generic.c:193
 memcpy+0x20/0x60 mm/kasan/common.c:106
 memcpy include/linux/string.h:381 [inline]
 fbcon_get_font+0x28d/0x5b0 drivers/video/fbdev/core/fbcon.c:2474
 con_font_get drivers/tty/vt/vt.c:4473 [inline]
 con_font_op+0x1f7/0x1160 drivers/tty/vt/vt.c:4632
 compat_fontx_ioctl drivers/tty/vt/vt_ioctl.c:1120 [inline]
 vt_compat_ioctl+0x50f/0x6c0 drivers/tty/vt/vt_ioctl.c:1210
 tty_compat_ioctl+0x19c/0x410 drivers/tty/tty_io.c:2847
 __do_compat_sys_ioctl fs/ioctl.c:857 [inline]
 __se_compat_sys_ioctl fs/ioctl.c:808 [inline]
 __ia32_compat_sys_ioctl+0x23d/0x2b0 fs/ioctl.c:808
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x270/0xe90 arch/x86/entry/common.c:396
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Allocated by task 16913:
 save_stack+0x1b/0x40 mm/kasan/common.c:49
 set_track mm/kasan/common.c:57 [inline]
 __kasan_kmalloc mm/kasan/common.c:495 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:468
 __do_kmalloc mm/slab.c:3656 [inline]
 __kmalloc+0x161/0x7a0 mm/slab.c:3665
 kmalloc include/linux/slab.h:560 [inline]
 fbcon_set_font+0x331/0x870 drivers/video/fbdev/core/fbcon.c:2672
 con_font_set drivers/tty/vt/vt.c:4565 [inline]
 con_font_op+0xd65/0x1160 drivers/tty/vt/vt.c:4630
 vt_ioctl+0xce5/0x26b0 drivers/tty/vt/vt_ioctl.c:928
 vt_compat_ioctl+0x16c/0x6c0 drivers/tty/vt/vt_ioctl.c:1249
 tty_compat_ioctl+0x19c/0x410 drivers/tty/tty_io.c:2847
 __do_compat_sys_ioctl fs/ioctl.c:857 [inline]
 __se_compat_sys_ioctl fs/ioctl.c:808 [inline]
 __ia32_compat_sys_ioctl+0x23d/0x2b0 fs/ioctl.c:808
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x270/0xe90 arch/x86/entry/common.c:396
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Freed by task 16482:
 save_stack+0x1b/0x40 mm/kasan/common.c:49
 set_track mm/kasan/common.c:57 [inline]
 kasan_set_free_info mm/kasan/common.c:317 [inline]
 __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:456
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x109/0x2b0 mm/slab.c:3757
 sk_prot_free net/core/sock.c:1641 [inline]
 __sk_destruct+0x5ad/0x7c0 net/core/sock.c:1725
 sk_destruct+0xc6/0x100 net/core/sock.c:1740
 __sk_free+0xef/0x3d0 net/core/sock.c:1751
 sk_free+0x78/0xa0 net/core/sock.c:1762
 deferred_put_nlk_sk+0x151/0x2e0 net/netlink/af_netlink.c:729
 rcu_do_batch kernel/rcu/tree.c:2206 [inline]
 rcu_core+0x59f/0x1370 kernel/rcu/tree.c:2433
 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292

The buggy address belongs to the object at ffff888028720000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1296 bytes inside of
 2048-byte region [ffff888028720000, ffff888028720800)
The buggy address belongs to the page:
page:ffffea0000a1c800 refcount:1 mapcount:0 mapping:000000004a6da4e5 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0000a5ec48 ffffea0000a46348 ffff88802c800e00
raw: 0000000000000000 ffff888028720000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888028720400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888028720480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888028720500: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                         ^
 ffff888028720580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888028720600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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