================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x5b5/0x660 net/xfrm/xfrm_policy.c:874 Read of size 1 at addr ffff888062eb8600 by task syz.0.527/6388 CPU: 1 PID: 6388 Comm: syz.0.527 Not tainted 5.15.180-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 xfrm_policy_inexact_list_reinsert+0x5b5/0x660 net/xfrm/xfrm_policy.c:874 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:1006 [inline] xfrm_policy_inexact_insert_node+0x8e7/0xb00 net/xfrm/xfrm_policy.c:1062 xfrm_policy_inexact_alloc_chain+0x604/0xe20 net/xfrm/xfrm_policy.c:1178 xfrm_policy_inexact_insert+0xea/0x13c0 net/xfrm/xfrm_policy.c:1221 xfrm_policy_insert+0xe6/0x930 net/xfrm/xfrm_policy.c:1602 xfrm_add_policy+0x4f7/0x9b0 net/xfrm/xfrm_user.c:1833 xfrm_user_rcv_msg+0x632/0x960 net/xfrm/xfrm_user.c:2979 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2489 xfrm_netlink_rcv+0x75/0x90 net/xfrm/xfrm_user.c:3001 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x7c0/0x990 net/netlink/af_netlink.c:1337 netlink_sendmsg+0xa30/0xd60 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2436 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2526 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f85fb37b969 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:00007f85f91e3038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f85fb5a2fa0 RCX: 00007f85fb37b969 RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000006 RBP: 00007f85fb3fdab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f85fb5a2fa0 R15: 00007fffead0dd08 Allocated by task 6388: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc+0x168/0x300 mm/slub.c:4407 kmalloc include/linux/slab.h:609 [inline] sk_prot_alloc+0xe0/0x200 net/core/sock.c:1866 sk_alloc+0x35/0x310 net/core/sock.c:1919 pfkey_create+0xda/0x580 net/key/af_key.c:152 __sock_create+0x460/0x8f0 net/socket.c:1486 sock_create net/socket.c:1542 [inline] __sys_socket+0x132/0x370 net/socket.c:1584 __do_sys_socket net/socket.c:1593 [inline] __se_sys_socket net/socket.c:1591 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1591 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff888062eb8000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1536 bytes inside of 2048-byte region [ffff888062eb8000, ffff888062eb8800) The buggy address belongs to the page: page:ffffea00018bae00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x62eb8 head:ffffea00018bae00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000b22e00 0000000200000002 ffff888017442000 raw: 0000000000000000 0000000000080008 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), pid 4167, ts 65041817586, free_ts 20535023896 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x3b78/0x3d40 mm/page_alloc.c:4192 __alloc_pages+0x272/0x700 mm/page_alloc.c:5466 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xbb/0x4b0 mm/slub.c:1975 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] __kmalloc_node_track_caller+0x1f6/0x390 mm/slub.c:4958 kmalloc_reserve net/core/skbuff.c:356 [inline] pskb_expand_head+0x111/0x1130 net/core/skbuff.c:1709 netlink_trim+0x183/0x220 net/netlink/af_netlink.c:1293 netlink_broadcast_filtered+0x72/0x12c0 net/netlink/af_netlink.c:1498 netlink_broadcast net/netlink/af_netlink.c:1543 [inline] nlmsg_multicast include/net/netlink.h:1033 [inline] nlmsg_notify+0xf7/0x1b0 net/netlink/af_netlink.c:2532 __dev_notify_flags+0xe0/0x3f0 net/core/dev.c:8886 rtnl_configure_link net/core/rtnetlink.c:-1 [inline] __rtnl_newlink net/core/rtnetlink.c:3532 [inline] rtnl_newlink+0x1a19/0x2050 net/core/rtnetlink.c:3572 rtnetlink_rcv_msg+0x99d/0xef0 net/core/rtnetlink.c:5650 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2489 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x7c0/0x990 net/netlink/af_netlink.c:1337 netlink_sendmsg+0xa30/0xd60 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] __sys_sendto+0x564/0x720 net/socket.c:2063 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396 free_contig_range+0x95/0xf0 mm/page_alloc.c:9385 destroy_args+0xfe/0x980 mm/debug_vm_pgtable.c:1018 debug_vm_pgtable+0x40d/0x470 mm/debug_vm_pgtable.c:1331 do_one_initcall+0x22b/0x7a0 init/main.c:1302 do_initcall_level+0x157/0x210 init/main.c:1375 do_initcalls+0x49/0x90 init/main.c:1391 kernel_init_freeable+0x425/0x5c0 init/main.c:1615 kernel_init+0x19/0x290 init/main.c:1506 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff888062eb8500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888062eb8580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc >ffff888062eb8600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888062eb8680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888062eb8700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================