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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 ffffffff8896b320 by task syz-executor.0/24127
CPU: 1 PID: 24127 Comm: syz-executor.0 Not tainted 5.8.0-rc6-next-20200720-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+0x5/0x497 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
 vc_do_resize+0xeec/0x1170 drivers/tty/vt/vt.c:1319
 vt_resizex drivers/tty/vt/vt_ioctl.c:814 [inline]
 vt_ioctl+0xeba/0x2c20 drivers/tty/vt/vt_ioctl.c:1026
 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+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1d9
Code: Bad RIP value.
RSP: 002b:00007f18f60e3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000001b900 RCX: 000000000045c1d9
RDX: 0000000020000040 RSI: 000000000000560a RDI: 0000000000000003
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffe4518f72f R14: 00007f18f60e49c0 R15: 000000000078bf0c
The buggy address belongs to the variable:
 __func__.0+0x120/0x1c0
Memory state around the buggy address:
 ffffffff8896b200: 00 03 f9 f9 f9 f9 f9 f9 00 01 f9 f9 f9 f9 f9 f9
 ffffffff8896b280: 04 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9
>ffffffff8896b300: 04 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9
                               ^
 ffffffff8896b380: 07 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9
 ffffffff8896b400: 00 04 f9 f9 f9 f9 f9 f9 00 02 f9 f9 f9 f9 f9 f9
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