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BUG: KASAN: slab-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:655 [inline]
BUG: KASAN: slab-out-of-bounds in bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline]
BUG: KASAN: slab-out-of-bounds in bit_putcs+0x132a/0x1bf0 drivers/video/fbdev/core/bitblit.c:185
Read of size 1 at addr ffff88808efa0e70 by task syz-executor.1/25846

CPU: 0 PID: 25846 Comm: syz-executor.1 Not tainted 5.8.0-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+0x1f0/0x31e 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
 __fb_pad_aligned_buffer include/linux/fb.h:655 [inline]
 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline]
 bit_putcs+0x132a/0x1bf0 drivers/video/fbdev/core/bitblit.c:185
 fbcon_putcs+0x790/0xaf0 drivers/video/fbdev/core/fbcon.c:1362
 do_update_region+0x462/0x620 drivers/tty/vt/vt.c:683
 invert_screen+0x3cd/0xca0 drivers/tty/vt/vt.c:800
 highlight drivers/tty/vt/selection.c:57 [inline]
 clear_selection+0x55/0x70 drivers/tty/vt/selection.c:84
 hide_cursor+0x28/0x310 drivers/tty/vt/vt.c:900
 redraw_screen+0x148/0x16f0 drivers/tty/vt/vt.c:1006
 fbcon_do_set_font+0xcec/0x1220 drivers/video/fbdev/core/fbcon.c:2615
 fbcon_copy_font+0xcc/0x130 drivers/video/fbdev/core/fbcon.c:2630
 con_font_copy drivers/tty/vt/vt.c:4634 [inline]
 con_font_op+0x8d1/0x1630 drivers/tty/vt/vt.c:4649
 vt_ioctl+0x24a3/0x3ec0 drivers/tty/vt/vt_ioctl.c:980
 tty_ioctl+0xee4/0x15c0 drivers/tty/tty_io.c:2656
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl fs/ioctl.c:753 [inline]
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:760
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ccd9
Code: 2d b6 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f2da23c4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000f580 RCX: 000000000045ccd9
RDX: 0000000020000400 RSI: 0000000000004b72 RDI: 0000000000000004
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffc4846781f R14: 00007f2da23c59c0 R15: 000000000078bf0c

Allocated by task 15637:
 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:2673
 con_font_set drivers/tty/vt/vt.c:4578 [inline]
 con_font_op+0xebc/0x1630 drivers/tty/vt/vt.c:4643
 vt_ioctl+0x179d/0x3ec0 drivers/tty/vt/vt_ioctl.c:265
 tty_ioctl+0xee4/0x15c0 drivers/tty/tty_io.c:2656
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl fs/ioctl.c:753 [inline]
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:760
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 7262:
 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
 skb_release_all net/core/skbuff.c:664 [inline]
 __kfree_skb+0x56/0x1c0 net/core/skbuff.c:678
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:573 [inline]
 nsim_dev_trap_report_work+0x7ee/0xb40 drivers/net/netdevsim/dev.c:598
 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

The buggy address belongs to the object at ffff88808efa0000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 3696 bytes inside of
 4096-byte region [ffff88808efa0000, ffff88808efa1000)
The buggy address belongs to the page:
page:ffffea00023be800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea00023be800 order:1 compound_mapcount:0
flags: 0xfffe0000010200(slab|head)
raw: 00fffe0000010200 ffffea0000f70488 ffffea00028a3408 ffff8880aa402000
raw: 0000000000000000 ffff88808efa0000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808efa0d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88808efa0d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88808efa0e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                             ^
 ffff88808efa0e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88808efa0f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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