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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:373 [inline]
BUG: KASAN: slab-out-of-bounds in soft_cursor+0x44b/0xa30 drivers/video/fbdev/core/softcursor.c:70
Read of size 9 at addr ffff8880a8d14db0 by task kworker/0:0/5

CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 4.19.150-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_power_efficient fb_flashcursor
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x22c/0x33e lib/dump_stack.c:118
 print_address_description.cold+0x56/0x25c mm/kasan/report.c:256
 kasan_report_error.cold+0x66/0xb9 mm/kasan/report.c:354
 kasan_report+0x8f/0x96 mm/kasan/report.c:412
 memcpy+0x20/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:373 [inline]
 soft_cursor+0x44b/0xa30 drivers/video/fbdev/core/softcursor.c:70
 bit_cursor+0x112a/0x1750 drivers/video/fbdev/core/bitblit.c:377
 fb_flashcursor+0x412/0x530 drivers/video/fbdev/core/fbcon.c:379
 process_one_work+0x796/0x14e0 kernel/workqueue.c:2155
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Allocated by task 22964:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15a/0x4f0 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 fbcon_set_font+0x421/0xc60 drivers/video/fbdev/core/fbcon.c:2467
 con_font_set drivers/tty/vt/vt.c:4537 [inline]
 con_font_op+0xd2b/0x1140 drivers/tty/vt/vt.c:4602
 vt_ioctl+0x128c/0x2af0 drivers/tty/vt/vt_ioctl.c:938
 tty_ioctl+0x5b0/0x1420 drivers/tty/tty_io.c:2669
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 9:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x250 mm/slab.c:3822
 skb_free_head net/core/skbuff.c:554 [inline]
 skb_release_data+0x6ea/0x930 net/core/skbuff.c:574
 skb_release_all net/core/skbuff.c:631 [inline]
 __kfree_skb net/core/skbuff.c:645 [inline]
 kfree_skb+0x11a/0x3f0 net/core/skbuff.c:663
 __netif_receive_skb_core+0x1384/0x33c0 net/core/dev.c:4928
 __netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:4952
 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066
 process_backlog+0x261/0x760 net/core/dev.c:5848
 napi_poll net/core/dev.c:6272 [inline]
 net_rx_action+0x4e5/0x10d0 net/core/dev.c:6338
 __do_softirq+0x27d/0xad2 kernel/softirq.c:292

The buggy address belongs to the object at ffff8880a8d14c80
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 304 bytes inside of
 512-byte region [ffff8880a8d14c80, ffff8880a8d14e80)
The buggy address belongs to the page:
page:ffffea0002a34500 count:1 mapcount:0 mapping:ffff88812c3f6940 index:0xffff8880a8d14000
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffffea00029fe188 ffffea0002a29288 ffff88812c3f6940
raw: ffff8880a8d14000 ffff8880a8d14000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a8d14c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880a8d14d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880a8d14d80: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                     ^
 ffff8880a8d14e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a8d14e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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