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BUG: KASAN: global-out-of-bounds in memcpy include/linux/string.h:347 [inline]
BUG: KASAN: global-out-of-bounds in soft_cursor+0x43d/0xa50 drivers/video/fbdev/core/softcursor.c:70
Read of size 32 at addr ffffffff8706cb60 by task syz-executor.3/31753

CPU: 0 PID: 31753 Comm: syz-executor.3 Not tainted 4.14.165-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+0x142/0x197 lib/dump_stack.c:58
 print_address_description.cold+0x5/0x1dc mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report mm/kasan/report.c:409 [inline]
 kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x123/0x190 mm/kasan/kasan.c:267
 memcpy+0x24/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:347 [inline]
 soft_cursor+0x43d/0xa50 drivers/video/fbdev/core/softcursor.c:70
 bit_cursor+0x11be/0x1830 drivers/video/fbdev/core/bitblit.c:386
 fbcon_cursor+0x4e3/0x6f0 drivers/video/fbdev/core/fbcon.c:1347
 hide_cursor+0x9d/0x2e0 drivers/tty/vt/vt.c:589
 redraw_screen+0x2a5/0x7c0 drivers/tty/vt/vt.c:679
 fbcon_do_set_font+0x6d1/0x9a0 drivers/video/fbdev/core/fbcon.c:2561
 fbcon_copy_font+0x12c/0x190 drivers/video/fbdev/core/fbcon.c:2576
 con_font_copy drivers/tty/vt/vt.c:4218 [inline]
 con_font_op+0x5c6/0x1060 drivers/tty/vt/vt.c:4233
 vt_ioctl+0x179f/0x2170 drivers/tty/vt/vt_ioctl.c:979
 tty_ioctl+0x841/0x1320 drivers/tty/tty_io.c:2661
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45aff9
RSP: 002b:00007fad72577c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fad725786d4 RCX: 000000000045aff9
RDX: 00000000200001c0 RSI: 0000000000004b72 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000349 R14: 00000000004c42dd R15: 000000000075bfd4

The buggy address belongs to the variable:
 str__msr__trace_system_name+0x200/0x9a0

Memory state around the buggy address:
 ffffffff8706ca00: fa fa fa fa 00 00 00 00 06 fa fa fa fa fa fa fa
 ffffffff8706ca80: 00 00 00 fa fa fa fa fa 00 00 00 fa fa fa fa fa
>ffffffff8706cb00: 00 00 00 03 fa fa fa fa 00 00 00 04 fa fa fa fa
                                                       ^
 ffffffff8706cb80: 00 00 00 00 03 fa fa fa fa fa fa fa 00 00 07 fa
 ffffffff8706cc00: fa fa fa fa 00 00 00 00 00 00 03 fa fa fa fa fa
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