Virtual processor ID = 0x0001 ================================================================== BUG: KASAN: global-out-of-bounds in fbcon_resize+0x705/0x7b0 drivers/video/fbdev/core/fbcon.c:2145 Read of size 4 at addr ffffffff86e69218 by task syz-executor.3/25426 CPU: 0 PID: 25426 Comm: syz-executor.3 Not tainted 4.14.198-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+0x5/0x1d3 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_load4_noabort+0x68/0x70 mm/kasan/report.c:429 fbcon_resize+0x705/0x7b0 drivers/video/fbdev/core/fbcon.c:2145 resize_screen drivers/tty/vt/vt.c:839 [inline] vc_do_resize+0x38b/0xe00 drivers/tty/vt/vt.c:901 vt_ioctl+0x1a27/0x1f50 drivers/tty/vt/vt_ioctl.c:905 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: 0033:0x45de59 RSP: 002b:00007f52bcc40c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000001d5c0 RCX: 000000000045de59 RDX: 0000000020000000 RSI: 000000000000560a RDI: 0000000000000005 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffc93f433bf R14: 00007f52bcc419c0 R15: 000000000118bf2c The buggy address belongs to the variable: font_vga_8x16+0x58/0x60 Memory state around the buggy address: ffffffff86e69100: 00 00 00 00 00 00 00 00 00 00 00 00 fa fa fa fa ffffffff86e69180: 00 fa fa fa fa fa fa fa 00 00 00 00 00 fa fa fa >ffffffff86e69200: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffffffff86e69280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffff86e69300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================