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BUG: KASAN: global-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:656 [inline]
BUG: KASAN: global-out-of-bounds in bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline]
BUG: KASAN: global-out-of-bounds in bit_putcs+0xbb6/0xd20 drivers/video/fbdev/core/bitblit.c:185
Read of size 1 at addr ffffffff88969ea4 by task syz-executor.2/10760

CPU: 0 PID: 10760 Comm: syz-executor.2 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+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0x5/0x436 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 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+0xbb6/0xd20 drivers/video/fbdev/core/bitblit.c:185
 fbcon_putcs+0x33c/0x3f0 drivers/video/fbdev/core/fbcon.c:1362
 do_update_region+0x399/0x630 drivers/tty/vt/vt.c:675
 redraw_screen+0x64e/0x770 drivers/tty/vt/vt.c:1034
 fbcon_do_set_font+0x7ec/0x950 drivers/video/fbdev/core/fbcon.c:2615
 fbcon_copy_font+0x125/0x190 drivers/video/fbdev/core/fbcon.c:2630
 con_font_copy drivers/tty/vt/vt.c:4718 [inline]
 con_font_op+0x65a/0x1110 drivers/tty/vt/vt.c:4733
 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:473 [inline]
 vt_ioctl+0x20b9/0x2c20 drivers/tty/vt/vt_ioctl.c:842
 tty_ioctl+0x1019/0x15f0 drivers/tty/tty_io.c:2656
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ce79
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:00007fdfc753dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000f5c0 RCX: 000000000045ce79
RDX: 0000000020000400 RSI: 0000000000004b72 RDI: 0000000000000003
RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffd237f7edf R14: 00007fdfc753e9c0 R15: 000000000118bf2c

The buggy address belongs to the variable:
 __func__.0+0x104/0x1c0

Memory state around the buggy address:
 ffffffff88969d80: fa fa fa fa 00 03 fa fa fa fa fa fa 00 01 fa fa
 ffffffff88969e00: fa fa fa fa 04 fa fa fa fa fa fa fa 04 fa fa fa
>ffffffff88969e80: fa fa fa fa 04 fa fa fa fa fa fa fa 04 fa fa fa
                               ^
 ffffffff88969f00: fa fa fa fa 07 fa fa fa fa fa fa fa 04 fa fa fa
 ffffffff88969f80: fa fa fa fa 00 04 fa fa fa fa fa fa 00 02 fa fa
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