Dev loop0: unable to read partition block 188829292
 loop0: RDSK (-336099328) unable to read partition table
loop0: partition table beyond EOD, truncated
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BUG: KASAN: slab-out-of-bounds in fbcon_get_font+0x5fc/0x660 drivers/video/fbdev/core/fbcon.c:2440
Read of size 1 at addr ffff888097868350 by task syz-executor.3/14039

CPU: 0 PID: 14039 Comm: syz-executor.3 Not tainted 4.14.195-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load1_noabort+0x68/0x70 mm/kasan/report.c:427
 fbcon_get_font+0x5fc/0x660 drivers/video/fbdev/core/fbcon.c:2440
 con_font_get drivers/tty/vt/vt.c:4105 [inline]
 con_font_op+0x1c6/0xf60 drivers/tty/vt/vt.c:4256
 do_fontx_ioctl drivers/tty/vt/vt_ioctl.c:273 [inline]
 vt_ioctl+0x14e3/0x1ea0 drivers/tty/vt/vt_ioctl.c:945
 tty_ioctl+0x50f/0x13c0 drivers/tty/tty_io.c:2661
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45d5b9
RSP: 002b:00007fc0bbaa3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000013040 RCX: 000000000045d5b9
RDX: 0000000020000680 RSI: 0000000000004b6b RDI: 0000000000000003
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffc5ce66d2f R14: 00007fc0bbaa49c0 R15: 000000000118cf4c

Allocated by task 8041:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15a/0x400 mm/slab.c:3729
 kmalloc include/linux/slab.h:493 [inline]
 fbcon_set_font+0x2fb/0x7c0 drivers/video/fbdev/core/fbcon.c:2621
 con_font_set drivers/tty/vt/vt.c:4189 [inline]
 con_font_op+0xb69/0xf60 drivers/tty/vt/vt.c:4254
 vt_ioctl+0x127b/0x1ea0 drivers/tty/vt/vt_ioctl.c:980
 tty_ioctl+0x50f/0x13c0 drivers/tty/tty_io.c:2661
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff888097860b40
 which belongs to the cache kmalloc-32768 of size 32768
The buggy address is located 30736 bytes inside of
 32768-byte region [ffff888097860b40, ffff888097868b40)
The buggy address belongs to the page:
page:ffffea00025e1800 count:1 mapcount:0 mapping:ffff888097860b40 index:0x0 compound_mapcount: 0
flags: 0xfffe0000008100(slab|head)
raw: 00fffe0000008100 ffff888097860b40 0000000000000000 0000000100000001
raw: ffffea000123dc20 ffffea0001216420 ffff88812fe51380 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888097868200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888097868280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888097868300: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
                                                 ^
 ffff888097868380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888097868400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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