================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x5b0/0x660 net/xfrm/xfrm_policy.c:855 Read of size 1 at addr ffff8881d4acd3d8 by task syz.3.369/1681 CPU: 0 PID: 1681 Comm: syz.3.369 Not tainted 5.4.290-syzkaller-00001-g986c38813dff #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 print_address_description+0x8c/0x600 mm/kasan/report.c:384 __kasan_report+0xf3/0x120 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:129 xfrm_policy_inexact_list_reinsert+0x5b0/0x660 net/xfrm/xfrm_policy.c:855 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:987 [inline] xfrm_policy_inexact_insert_node+0x923/0xb10 net/xfrm/xfrm_policy.c:1043 xfrm_policy_inexact_alloc_chain+0x4ec/0xaf0 net/xfrm/xfrm_policy.c:1159 xfrm_policy_inexact_insert+0x6a/0x1160 net/xfrm/xfrm_policy.c:1202 xfrm_policy_insert+0xe7/0x940 net/xfrm/xfrm_policy.c:1585 xfrm_add_policy+0x4f2/0x980 net/xfrm/xfrm_user.c:1720 xfrm_user_rcv_msg+0x689/0x9b0 net/xfrm/xfrm_user.c:2775 netlink_rcv_skb+0x1d5/0x420 net/netlink/af_netlink.c:2467 xfrm_netlink_rcv+0x72/0x90 net/xfrm/xfrm_user.c:2797 netlink_unicast_kernel net/netlink/af_netlink.c:1306 [inline] netlink_unicast+0x936/0xb20 net/netlink/af_netlink.c:1332 netlink_sendmsg+0xa46/0xd00 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec net/socket.c:638 [inline] __sock_sendmsg net/socket.c:650 [inline] ____sys_sendmsg+0x5ac/0x8f0 net/socket.c:2306 ___sys_sendmsg net/socket.c:2360 [inline] __sys_sendmsg+0x28b/0x380 net/socket.c:2406 __do_sys_sendmsg net/socket.c:2415 [inline] __se_sys_sendmsg net/socket.c:2413 [inline] __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2413 do_syscall_64+0xd8/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f6fe8b07969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6fe7170038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f6fe8d2efa0 RCX: 00007f6fe8b07969 RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000006 RBP: 00007f6fe8b89ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6fe8d2efa0 R15: 00007ffd8c9debb8 Allocated by task 1681: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:543 __kmalloc+0x129/0x2e0 mm/slub.c:3913 kmalloc include/linux/slab.h:561 [inline] sk_prot_alloc+0xc2/0x440 net/core/sock.c:1622 sk_alloc+0x39/0x310 net/core/sock.c:1680 pfkey_create+0x12c/0x650 net/key/af_key.c:154 __sock_create+0x3ce/0x790 net/socket.c:1427 sock_create net/socket.c:1478 [inline] __sys_socket+0x132/0x370 net/socket.c:1520 __do_sys_socket net/socket.c:1529 [inline] __se_sys_socket net/socket.c:1527 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1527 do_syscall_64+0xd8/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 357: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487 kasan_slab_free+0xe/0x10 mm/kasan/common.c:496 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook mm/slub.c:1494 [inline] slab_free mm/slub.c:3080 [inline] kfree+0x123/0x360 mm/slub.c:4071 kvfree+0x46/0x50 mm/util.c:625 xt_free_table_info+0x15e/0x1a0 net/netfilter/x_tables.c:1192 __do_replace+0x7c8/0xad0 net/ipv6/netfilter/ip6_tables.c:1105 do_replace net/ipv6/netfilter/ip6_tables.c:1158 [inline] do_ip6t_set_ctl+0x404/0x600 net/ipv6/netfilter/ip6_tables.c:1684 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x26b/0x290 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0x148/0x180 net/ipv6/ipv6_sockglue.c:962 tcp_setsockopt+0xb1/0xc0 net/ipv4/tcp.c:3207 sock_common_setsockopt+0x99/0xb0 net/core/sock.c:3223 __sys_setsockopt+0x4b4/0x840 net/socket.c:2093 __do_sys_setsockopt net/socket.c:2109 [inline] __se_sys_setsockopt net/socket.c:2106 [inline] __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2106 do_syscall_64+0xd8/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 The buggy address belongs to the object at ffff8881d4acd000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 984 bytes inside of 1024-byte region [ffff8881d4acd000, ffff8881d4acd400) The buggy address belongs to the page: page:ffffea000752b200 refcount:1 mapcount:0 mapping:ffff8881f5c02280 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 ffffea0007b01400 0000000300000003 ffff8881f5c02280 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x192/0x370 mm/page_alloc.c:2171 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893 alloc_slab_page+0x3b/0x400 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x98/0x430 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x2e0/0x460 mm/slub.c:2667 __slab_alloc+0x63/0xa0 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc_track_caller+0x17f/0x2c0 mm/slub.c:4449 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xbc/0x4f0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1080 [inline] nlmsg_new include/net/netlink.h:888 [inline] inet6_rt_notify+0x2db/0x550 net/ipv6/route.c:5988 fib6_add_rt2node net/ipv6/ip6_fib.c:1187 [inline] fib6_add+0x2444/0x3df0 net/ipv6/ip6_fib.c:1416 __ip6_ins_rt net/ipv6/route.c:1322 [inline] ip6_route_add+0x8a/0x130 net/ipv6/route.c:3766 addrconf_add_mroute net/ipv6/addrconf.c:2507 [inline] addrconf_add_dev+0x41f/0x610 net/ipv6/addrconf.c:2525 addrconf_dev_config+0x1a9/0x320 net/ipv6/addrconf.c:3416 addrconf_notify+0x8fa/0xec0 net/ipv6/addrconf.c:3660 notifier_call_chain kernel/notifier.c:98 [inline] __raw_notifier_call_chain kernel/notifier.c:399 [inline] raw_notifier_call_chain+0x9f/0x110 kernel/notifier.c:406 page_owner free stack trace missing Memory state around the buggy address: ffff8881d4acd280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881d4acd300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881d4acd380: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ^ ffff8881d4acd400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881d4acd480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================