================================================================== F2FS-fs (loop1): Unable to read 1th superblock F2FS-fs (loop1): Unable to read 2th superblock F2FS-fs (loop1): Unable to read 1th superblock F2FS-fs (loop1): Unable to read 2th superblock BUG: KASAN: use-after-free in _copy_to_user+0x9a/0xc0 lib/usercopy.c:27 Read of size 57692 at addr ffff8801a047fff2 by task syz-executor2/30028 CPU: 1 PID: 30028 Comm: syz-executor2 Not tainted 4.14.81+ #6 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 print_address_description+0x60/0x22b mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report.cold.6+0x11b/0x2dd mm/kasan/report.c:409 _copy_to_user+0x9a/0xc0 lib/usercopy.c:27 copy_to_user include/linux/uaccess.h:155 [inline] bpf_test_finish.isra.0+0xc8/0x190 net/bpf/test_run.c:59 bpf_prog_test_run_skb+0x4d0/0x8c0 net/bpf/test_run.c:144 bpf_prog_test_run kernel/bpf/syscall.c:1343 [inline] SYSC_bpf kernel/bpf/syscall.c:1615 [inline] SyS_bpf+0x79d/0x3700 kernel/bpf/syscall.c:1560 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457569 RSP: 002b:00007f2fe880ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569 RDX: 0000000000000028 RSI: 00000000200001c0 RDI: 000000000000000a RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2fe880b6d4 R13: 00000000004bd892 R14: 00000000004cc568 R15: 00000000ffffffff The buggy address belongs to the page: page:ffffea0006811fc0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x4000000000000000() raw: 4000000000000000 0000000000000000 0000000000000000 00000000ffffffff raw: dead000000000100 dead000000000200 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801a047fe80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8801a047ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff8801a047ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8801a0480000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801a0480080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================