audit: type=1400 audit(1571668306.657:36): avc: denied { map } for pid=7501 comm="syz-executor725" path="/root/syz-executor725997888" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 ================================================================== BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 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 PGD 8f0b8067 Read of size 63 at addr 0000000000000000 by task syz-executor725/7509 P4D 8f0b8067 PUD 998b2067 CPU: 1 PID: 7509 Comm: syz-executor725 Not tainted 4.19.80 #0 PMD 0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: Oops: 0000 [#1] PREEMPT SMP KASAN __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 CPU: 0 PID: 7510 Comm: syz-executor725 Not tainted 4.19.80 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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 RIP: 0010:memcpy_erms+0x6/0x10 arch/x86/lib/memcpy_64.S:55 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x123/0x190 mm/kasan/kasan.c:267 Code: 90 90 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 a4 c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe memcpy+0x24/0x50 mm/kasan/kasan.c:302 RSP: 0018:ffff888092017ba8 EFLAGS: 00010246 memcpy include/linux/string.h:348 [inline] llcp_sock_getname+0x358/0x460 net/nfc/llcp_sock.c:531 RAX: ffff888092017d32 RBX: ffff888092017d20 RCX: 000000000000003f RDX: 000000000000003f RSI: 0000000000000000 RDI: ffff888092017d32 sock_getsockopt+0x149a/0x1c66 net/core/sock.c:1265 RBP: ffff888092017bc8 R08: 1ffff11012402fa6 R09: ffffed1012402faf R10: ffffed1012402fae R11: ffff888092017d70 R12: 000000000000003f R13: ffff888092017d32 R14: 0000000000000000 R15: ffff888094985b00 FS: 0000000001aa8880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000009c201000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 __sys_getsockopt+0x213/0x240 net/socket.c:1934 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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 __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: 0033:0x4412b9 Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd270acb18 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004412b9 __sys_getsockopt+0x213/0x240 net/socket.c:1934 RDX: 000000000000001c RSI: 0000000000000001 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 0000000020000140 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402030 R13: 00000000004020c0 R14: 0000000000000000 R15: 0000000000000000 ==================================================================