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BUG: KASAN: slab-out-of-bounds in soft_cursor+0x62c/0xdb0 drivers/video/fbdev/core/softcursor.c:61
Read of size 1 at addr ffff88809645a610 by task kworker/0:1/12

CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.9.0-rc6-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+0x1d6/0x29e 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
 soft_cursor+0x62c/0xdb0 drivers/video/fbdev/core/softcursor.c:61
 bit_cursor+0x1753/0x2110 drivers/video/fbdev/core/bitblit.c:377
 fb_flashcursor+0x71c/0xa00 drivers/video/fbdev/core/fbcon.c:397
 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269
 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415
 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Allocated by task 8295:
 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+0x205/0x300 mm/slab.c:3664
 kmalloc include/linux/slab.h:559 [inline]
 fbcon_set_font+0x2c4/0x970 drivers/video/fbdev/core/fbcon.c:2496
 con_font_set drivers/tty/vt/vt.c:4663 [inline]
 con_font_op+0xebc/0x1630 drivers/tty/vt/vt.c:4728
 vt_io_ioctl drivers/tty/vt/vt_ioctl.c:506 [inline]
 vt_ioctl+0xd7f/0x3d70 drivers/tty/vt/vt_ioctl.c:856
 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

The buggy address belongs to the object at ffff88809645a400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 16 bytes to the right of
 512-byte region [ffff88809645a400, ffff88809645a600)
The buggy address belongs to the page:
page:0000000095f5e223 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88809645a800 pfn:0x9645a
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea000238f908 ffffea0002a6b8c8 ffff8880aa440600
raw: ffff88809645a800 ffff88809645a000 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809645a500: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809645a580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88809645a600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                         ^
 ffff88809645a680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809645a700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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