================================================================== BUG: KASAN: null-ptr-deref in memcpy include/linux/string.h:348 [inline] BUG: KASAN: null-ptr-deref in llcp_sock_getname+0x347/0x440 net/nfc/llcp_sock.c:531 Read of size 43 at addr 0000000000000000 by task syz-executor.0/31075 CPU: 1 PID: 31075 Comm: syz-executor.0 Not tainted 4.19.117-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+0x188/0x20d 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+0x194/0x2b9 mm/kasan/report.c:396 memcpy+0x20/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:348 [inline] llcp_sock_getname+0x347/0x440 net/nfc/llcp_sock.c:531 __sys_getpeername+0x10b/0x250 net/socket.c:1735 __do_sys_getpeername net/socket.c:1748 [inline] __se_sys_getpeername net/socket.c:1745 [inline] __x64_sys_getpeername+0x6f/0xb0 net/socket.c:1745 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c829 Code: 0d b7 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5a61efdc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000034 RAX: ffffffffffffffda RBX: 00000000004dc8c0 RCX: 000000000045c829 RDX: 0000000020000240 RSI: 0000000020000280 RDI: 0000000000000005 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000000f8 R14: 00000000004c37a9 R15: 00007f5a61efe6d4 ================================================================== audit: type=1326 audit(1587540198.077:133): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=31086 comm="syz-executor.5" exe="/root/syz-executor.5" sig=31 arch=c000003e syscall=228 compat=0 ip=0x45f66a code=0x0