================================================================== 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 ffff8881ea4a33d8 by task syz.2.24/450 CPU: 1 PID: 450 Comm: syz.2.24 Not tainted 5.4.290-syzkaller #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: 0033:0x7f5349d3f169 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:00007f53483a8038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f5349f66fa0 RCX: 00007f5349d3f169 RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000007 RBP: 00007f5349dc1a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5349f66fa0 R15: 00007ffd7fdae0e8 Allocated by task 450: 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 0: (stack is not available) The buggy address belongs to the object at ffff8881ea4a3000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 984 bytes inside of 1024-byte region [ffff8881ea4a3000, ffff8881ea4a3400) The buggy address belongs to the page: page:ffffea0007a92800 refcount:1 mapcount:0 mapping:ffff8881f5c02280 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL) 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+0x175/0x2e0 mm/slub.c:3909 __kmalloc_node include/linux/slab.h:422 [inline] kmalloc_node include/linux/slab.h:599 [inline] kvmalloc_node+0x7e/0xe0 mm/util.c:596 kvmalloc include/linux/mm.h:761 [inline] xt_alloc_table_info+0x42/0xb0 net/netfilter/x_tables.c:1172 do_replace net/ipv6/netfilter/ip6_tables.c:1143 [inline] do_ip6t_set_ctl+0x299/0x600 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 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] __free_pages_ok+0x847/0x950 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4955 [inline] __free_pages+0x91/0x140 mm/page_alloc.c:4961 free_thread_stack kernel/fork.c:299 [inline] release_task_stack kernel/fork.c:439 [inline] put_task_stack+0x21d/0x260 kernel/fork.c:450 finish_task_switch+0x24a/0x590 kernel/sched/core.c:3479 context_switch kernel/sched/core.c:3611 [inline] __schedule+0xb0d/0x1320 kernel/sched/core.c:4307 schedule+0x130/0x1c0 kernel/sched/core.c:4375 freezable_schedule include/linux/freezer.h:172 [inline] do_nanosleep+0x1c3/0x690 kernel/time/hrtimer.c:1940 hrtimer_nanosleep+0x245/0x450 kernel/time/hrtimer.c:1993 common_nsleep+0x28/0x30 kernel/time/posix-timers.c:1203 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1231 [inline] __se_sys_clock_nanosleep+0x33c/0x3d0 kernel/time/posix-timers.c:1208 __x64_sys_clock_nanosleep+0x9b/0xb0 kernel/time/posix-timers.c:1208 do_syscall_64+0xd8/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Memory state around the buggy address: ffff8881ea4a3280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881ea4a3300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881ea4a3380: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ^ ffff8881ea4a3400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881ea4a3480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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