audit: type=1400 audit(1580113720.793:38): avc: denied { write } for pid=8013 comm="syz-executor049" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1 ================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xd2/0xf5 lib/list_debug.c:42 Read of size 8 at addr ffff88809a072a48 by task syz-executor049/8024 CPU: 0 PID: 8024 Comm: syz-executor049 Not tainted 4.19.98-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 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __list_del_entry_valid+0xd2/0xf5 lib/list_debug.c:42 __list_del_entry include/linux/list.h:117 [inline] list_del_rcu include/linux/rculist.h:130 [inline] __nf_tables_abort+0x1e77/0x2a70 net/netfilter/nf_tables_api.c:6648 nf_tables_abort+0x17/0x30 net/netfilter/nf_tables_api.c:6758 nfnetlink_rcv_batch+0xae3/0x1750 net/netfilter/nfnetlink.c:491 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:540 [inline] nfnetlink_rcv+0x3ed/0x460 net/netfilter/nfnetlink.c:558 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x53a/0x730 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 ___sys_sendmsg+0x803/0x920 net/socket.c:2115 __sys_sendmsg+0x105/0x1d0 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x447089 Code: e8 dc e6 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 2b 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0556bc4d98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000006dcc28 RCX: 0000000000447089 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c R13: 000000200a000000 R14: 0000000000006c00 R15: 0000001000000014 Allocated by task 8024: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 kmem_cache_alloc_trace+0x152/0x760 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] nf_tables_newtable+0xa99/0x1430 net/netfilter/nf_tables_api.c:869 nfnetlink_rcv_batch+0xef6/0x1750 net/netfilter/nfnetlink.c:430 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:540 [inline] nfnetlink_rcv+0x3ed/0x460 net/netfilter/nfnetlink.c:558 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x53a/0x730 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 ___sys_sendmsg+0x803/0x920 net/socket.c:2115 __sys_sendmsg+0x105/0x1d0 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8027: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3503 [inline] kfree+0xcf/0x220 mm/slab.c:3822 nf_tables_table_destroy.isra.0+0xef/0x130 net/netfilter/nf_tables_api.c:1048 nft_commit_release net/netfilter/nf_tables_api.c:6265 [inline] nf_tables_commit_release net/netfilter/nf_tables_api.c:6305 [inline] nf_tables_commit+0x2d9d/0x41a0 net/netfilter/nf_tables_api.c:6595 nfnetlink_rcv_batch+0xcf6/0x1750 net/netfilter/nfnetlink.c:482 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:540 [inline] nfnetlink_rcv+0x3ed/0x460 net/netfilter/nfnetlink.c:558 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x53a/0x730 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 ___sys_sendmsg+0x803/0x920 net/socket.c:2115 __sys_sendmsg+0x105/0x1d0 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2160 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88809a072a40 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff88809a072a40, ffff88809a072c40) The buggy address belongs to the page: page:ffffea0002681c80 count:1 mapcount:0 mapping:ffff88812c31c940 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffffea000294efc8 ffffea0002633a48 ffff88812c31c940 raw: 0000000000000000 ffff88809a072040 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809a072900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809a072980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88809a072a00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff88809a072a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809a072b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================