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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 4 at addr ffff88809ce68008 by task kworker/0:5/8162

CPU: 0 PID: 8162 Comm: kworker/0:5 Not tainted 5.9.0-rc7-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
 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+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 6863:
 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
 slab_post_alloc_hook+0x3e/0x290 mm/slab.h:518
 slab_alloc mm/slab.c:3316 [inline]
 kmem_cache_alloc+0x1c1/0x2d0 mm/slab.c:3486
 vm_area_dup kernel/fork.c:355 [inline]
 dup_mmap+0x53c/0xd60 kernel/fork.c:531
 dup_mm+0x98/0x320 kernel/fork.c:1355
 copy_mm kernel/fork.c:1411 [inline]
 copy_process+0x1fdc/0x5200 kernel/fork.c:2070
 _do_fork+0x1ab/0x6d0 kernel/fork.c:2429
 __do_sys_clone kernel/fork.c:2546 [inline]
 __se_sys_clone kernel/fork.c:2530 [inline]
 __x64_sys_clone+0x1e9/0x230 kernel/fork.c:2530
 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 ffff88809ce68040
 which belongs to the cache vm_area_struct of size 200
The buggy address is located 56 bytes to the left of
 200-byte region [ffff88809ce68040, ffff88809ce68108)
The buggy address belongs to the page:
page:00000000433448f8 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9ce68
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0002816408 ffffea00027d7e48 ffff8880aa46f600
raw: 0000000000000000 ffff88809ce68040 000000010000000f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809ce67f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88809ce67f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88809ce68000: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
                      ^
 ffff88809ce68080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88809ce68100: 00 fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00
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