================================================================== BUG: KASAN: use-after-free in xfrm_policy_insert_list+0xd32/0xfb0 net/xfrm/xfrm_policy.c:1532 Read of size 1 at addr ffff88806aadb419 by task syz-executor4/7559 CPU: 1 PID: 7559 Comm: syz-executor4 Not tainted 4.20.0+ #10 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+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:132 xfrm_policy_insert_list+0xd32/0xfb0 net/xfrm/xfrm_policy.c:1532 xfrm_policy_inexact_insert+0x155/0xda0 net/xfrm/xfrm_policy.c:1195 xfrm_policy_insert+0x623/0x910 net/xfrm/xfrm_policy.c:1570 pfkey_spdadd+0x111a/0x19a0 net/key/af_key.c:2339 pfkey_process+0x6d2/0x810 net/key/af_key.c:2844 pfkey_sendmsg+0x5bb/0xfc0 net/key/af_key.c:3683 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x7ec/0x910 net/socket.c:2116 __sys_sendmsg+0x112/0x270 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9a97205c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9a972066d4 R13: 00000000004c5305 R14: 00000000004d8d70 R15: 00000000ffffffff Allocated by task 2533: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] kasan_kmalloc mm/kasan/common.c:482 [inline] kasan_kmalloc+0xcf/0xe0 mm/kasan/common.c:455 __do_kmalloc_node mm/slab.c:3671 [inline] __kmalloc_node_track_caller+0x4e/0x70 mm/slab.c:3685 __kmalloc_reserve.isra.0+0x40/0xe0 net/core/skbuff.c:140 pskb_expand_head+0x1f6/0x1080 net/core/skbuff.c:1465 netlink_trim+0x2f1/0x380 net/netlink/af_netlink.c:1292 netlink_broadcast_filtered+0xda/0x16f0 net/netlink/af_netlink.c:1489 netlink_broadcast net/netlink/af_netlink.c:1534 [inline] nlmsg_multicast include/net/netlink.h:734 [inline] nlmsg_notify+0x93/0x1c0 net/netlink/af_netlink.c:2520 rtnl_notify net/core/rtnetlink.c:742 [inline] rtmsg_ifinfo_send+0x76/0x90 net/core/rtnetlink.c:3431 rollback_registered_many+0xd71/0x1370 net/core/dev.c:8119 unregister_netdevice_many.part.0+0x8e/0x470 net/core/dev.c:9207 unregister_netdevice_many net/core/dev.c:9206 [inline] default_device_exit_batch+0x4c9/0x5f0 net/core/dev.c:9676 ops_exit_list.isra.0+0x105/0x160 net/core/net_namespace.c:156 cleanup_net+0x51d/0xb10 net/core/net_namespace.c:551 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Freed by task 2533: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:444 kasan_slab_free+0xe/0x10 mm/kasan/common.c:452 __cache_free mm/slab.c:3485 [inline] kfree+0xcf/0x230 mm/slab.c:3804 skb_free_head+0x93/0xb0 net/core/skbuff.c:553 skb_release_data+0x6ea/0x970 net/core/skbuff.c:573 skb_release_all+0x4d/0x60 net/core/skbuff.c:627 __kfree_skb net/core/skbuff.c:641 [inline] consume_skb net/core/skbuff.c:701 [inline] consume_skb+0x18c/0x550 net/core/skbuff.c:695 netlink_broadcast_filtered+0x6e7/0x16f0 net/netlink/af_netlink.c:1512 netlink_broadcast net/netlink/af_netlink.c:1534 [inline] nlmsg_multicast include/net/netlink.h:734 [inline] nlmsg_notify+0x93/0x1c0 net/netlink/af_netlink.c:2520 rtnl_notify net/core/rtnetlink.c:742 [inline] rtmsg_ifinfo_send+0x76/0x90 net/core/rtnetlink.c:3431 rollback_registered_many+0xd71/0x1370 net/core/dev.c:8119 unregister_netdevice_many.part.0+0x8e/0x470 net/core/dev.c:9207 unregister_netdevice_many net/core/dev.c:9206 [inline] default_device_exit_batch+0x4c9/0x5f0 net/core/dev.c:9676 ops_exit_list.isra.0+0x105/0x160 net/core/net_namespace.c:156 cleanup_net+0x51d/0xb10 net/core/net_namespace.c:551 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff88806aadb200 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 537 bytes inside of 1024-byte region [ffff88806aadb200, ffff88806aadb600) The buggy address belongs to the page: page:ffffea0001aab680 count:1 mapcount:0 mapping:ffff88812c3f0ac0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea000283d188 ffffea0002a54b88 ffff88812c3f0ac0 raw: 0000000000000000 ffff88806aada000 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88806aadb300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806aadb380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88806aadb400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806aadb480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806aadb500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================