BTRFS error (device loop2): superblock checksum mismatch
BTRFS error (device loop2): open_ctree failed
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BUG: KASAN: null-ptr-deref in memcpy include/linux/string.h:348 [inline]
BUG: KASAN: null-ptr-deref in llcp_sock_getname+0x358/0x460 net/nfc/llcp_sock.c:531
Read of size 43 at addr 0000000000000000 by task syz-executor.5/11544

CPU: 1 PID: 11544 Comm: syz-executor.5 Not tainted 4.19.93-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 kasan_report_error mm/kasan/report.c:352 [inline]
 kasan_report mm/kasan/report.c:412 [inline]
 kasan_report.cold+0x199/0x2ba mm/kasan/report.c:396
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x123/0x190 mm/kasan/kasan.c:267
 memcpy+0x24/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:348 [inline]
 llcp_sock_getname+0x358/0x460 net/nfc/llcp_sock.c:531
 sock_getsockopt+0x149a/0x1c66 net/core/sock.c:1265
 __sys_getsockopt+0x213/0x240 net/socket.c:1934
 __do_sys_getsockopt net/socket.c:1949 [inline]
 __se_sys_getsockopt net/socket.c:1946 [inline]
 __x64_sys_getsockopt+0xbe/0x150 net/socket.c:1946
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45af49
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f00fc0efc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045af49
RDX: 000000000000001c RSI: 0000000000000001 RDI: 0000000000000005
RBP: 000000000075c070 R08: 00000000200001c0 R09: 0000000000000000
R10: 0000000020000080 R11: 0000000000000246 R12: 00007f00fc0f06d4
R13: 00000000004c271e R14: 00000000004d8890 R15: 00000000ffffffff
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