Dev loop0: unable to read partition block 188829292 loop0: RDSK (-336099328) unable to read partition table loop0: partition table beyond EOD, truncated ================================================================== 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 ==================================================================