================================================================== BUG: KASAN: global-out-of-bounds in memcpy include/linux/string.h:347 [inline] BUG: KASAN: global-out-of-bounds in fbcon_get_font+0x262/0x530 drivers/video/fbdev/core/fbcon.c:2424 Read of size 32 at addr ffffffff86c688a0 by task syz-executor.2/32419 CPU: 0 PID: 32419 Comm: syz-executor.2 Not tainted 4.14.184-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+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+0xa9/0x2b9 mm/kasan/report.c:393 memcpy+0x20/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:347 [inline] fbcon_get_font+0x262/0x530 drivers/video/fbdev/core/fbcon.c:2424 con_font_get drivers/tty/vt/vt.c:4098 [inline] con_font_op+0x1c6/0xf70 drivers/tty/vt/vt.c:4249 vt_ioctl+0x1376/0x1f20 drivers/tty/vt/vt_ioctl.c:980 tty_ioctl+0x6c9/0x1220 drivers/tty/tty_io.c:2661 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 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: 0033:0x45cb29 RSP: 002b:00007fc0cb79ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e7620 RCX: 000000000045cb29 RDX: 0000000020000400 RSI: 0000000000004b72 RDI: 0000000000000004 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000037f R14: 00000000004c6226 R15: 00007fc0cb79f6d4 The buggy address belongs to the variable: fontdata_8x16+0x1000/0x1120 Memory state around the buggy address: ffffffff86c68780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffff86c68800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffffff86c68880: 00 00 00 00 fa fa fa fa 06 fa fa fa fa fa fa fa ^ ffffffff86c68900: 05 fa fa fa fa fa fa fa 06 fa fa fa fa fa fa fa ffffffff86c68980: 00 00 03 fa fa fa fa fa 00 00 00 00 00 00 00 00 ==================================================================