hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 ================================================================== hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:347 [inline] BUG: KASAN: slab-out-of-bounds in fbcon_get_font+0x288/0x550 drivers/video/fbdev/core/fbcon.c:2421 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 Read of size 16 at addr ffff8880620232d0 by task syz-executor.3/28665 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 CPU: 0 PID: 28665 Comm: syz-executor.3 Not tainted 4.14.158-syzkaller #0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 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 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x123/0x190 mm/kasan/kasan.c:267 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 memcpy+0x24/0x50 mm/kasan/kasan.c:302 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 memcpy include/linux/string.h:347 [inline] fbcon_get_font+0x288/0x550 drivers/video/fbdev/core/fbcon.c:2421 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 con_font_get drivers/tty/vt/vt.c:4078 [inline] con_font_op+0x1d5/0x1060 drivers/tty/vt/vt.c:4229 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 vt_ioctl+0x179f/0x2170 drivers/tty/vt/vt_ioctl.c:979 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 tty_ioctl+0x841/0x1320 drivers/tty/tty_io.c:2661 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 hid-generic 0000:0000:0000.00C7: unknown main item tag 0x0 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a909 RSP: 002b:00007f560061ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a909 RDX: 0000000020000400 RSI: 0000000000004b72 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f560061b6d4 R13: 00000000004c3a55 R14: 00000000004d8f90 R15: 00000000ffffffff Allocated by task 12320: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15d/0x7a0 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] fbcon_set_font+0x2f8/0x7b0 drivers/video/fbdev/core/fbcon.c:2618 con_font_set drivers/tty/vt/vt.c:4162 [inline] con_font_op+0xc0f/0x1060 drivers/tty/vt/vt.c:4227 vt_ioctl+0xb80/0x2170 drivers/tty/vt/vt_ioctl.c:927 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 Freed by task 23560: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcc/0x270 mm/slab.c:3815 destroy_super_work+0x42/0x50 fs/super.c:158 process_one_work+0x863/0x1600 kernel/workqueue.c:2114 worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 The buggy address belongs to the object at ffff8880620225c0 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 3344 bytes inside of 4096-byte region [ffff8880620225c0, ffff8880620235c0) The buggy address belongs to the page: page:ffffea0001880880 count:1 mapcount:0 mapping:ffff8880620225c0 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffff8880620225c0 0000000000000000 0000000100000001 raw: ffffea000205c4a0 ffffea0002073620 ffff8880aa800dc0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888062023180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888062023200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888062023280: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ^ ffff888062023300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888062023380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================