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BUG: KASAN: slab-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:656 [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+0x103a/0x1bf0 drivers/video/fbdev/core/bitblit.c:185
Read of size 1 at addr ffff888055861d06 by task syz-executor.3/20021

CPU: 1 PID: 20021 Comm: syz-executor.3 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+0x66/0x620 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:656 [inline]
 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline]
 bit_putcs+0x103a/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:675
 redraw_screen+0xa25/0x1420 drivers/tty/vt/vt.c:1034
 vc_do_resize+0x11ab/0x1790 drivers/tty/vt/vt.c:1325
 vt_resizex drivers/tty/vt/vt_ioctl.c:814 [inline]
 vt_ioctl+0x3032/0x3c60 drivers/tty/vt/vt_ioctl.c:1026
 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
RIP: 0033:0x45ce69
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:00007f9f47417c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000001c340 RCX: 000000000045ce69
RDX: 0000000020000040 RSI: 000000000000560a RDI: 0000000000000003
RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffccef7da0f R14: 00007f9f474189c0 R15: 000000000118bf2c

Allocated by task 19325:
 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+0x218/0x320 mm/slab.c:3664
 kmalloc include/linux/slab.h:559 [inline]
 fbcon_set_font+0x2c4/0x970 drivers/video/fbdev/core/fbcon.c:2673
 con_font_set drivers/tty/vt/vt.c:4662 [inline]
 con_font_op+0xebc/0x1630 drivers/tty/vt/vt.c:4727
 vt_io_ioctl drivers/tty/vt/vt_ioctl.c:506 [inline]
 vt_ioctl+0xd7f/0x3c60 drivers/tty/vt/vt_ioctl.c:846
 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 ffff888055861800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 262 bytes to the right of
 1024-byte region [ffff888055861800, ffff888055861c00)
The buggy address belongs to the page:
page:00000000e09c0203 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x55861
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0002537e48 ffffea0002a51dc8 ffff8880aa440700
raw: 0000000000000000 ffff888055861000 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888055861c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888055861c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888055861d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff888055861d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888055861e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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