================================================================== BUG: KASAN: slab-use-after-free in __xfrm_state_lookup_all net/xfrm/xfrm_state.c:-1 [inline] BUG: KASAN: slab-use-after-free in xfrm_state_find+0x2635/0x4510 net/xfrm/xfrm_state.c:1284 Read of size 1 at addr ffff88805cd006f8 by task syz.4.1511/10912 CPU: 0 PID: 10912 Comm: syz.4.1511 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xac/0x220 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 __xfrm_state_lookup_all net/xfrm/xfrm_state.c:-1 [inline] xfrm_state_find+0x2635/0x4510 net/xfrm/xfrm_state.c:1284 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2502 [inline] xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:2547 [inline] xfrm_resolve_and_create_bundle+0x727/0x2c20 net/xfrm/xfrm_policy.c:2841 xfrm_bundle_lookup net/xfrm/xfrm_policy.c:3076 [inline] xfrm_lookup_with_ifid+0x556/0x19c0 net/xfrm/xfrm_policy.c:3207 xfrm_lookup net/xfrm/xfrm_policy.c:3304 [inline] xfrm_lookup_route+0x3c/0x1b0 net/xfrm/xfrm_policy.c:3315 ip_route_connect include/net/route.h:328 [inline] tcp_v4_connect+0x7a7/0x18d0 net/ipv4/tcp_ipv4.c:244 __inet_stream_connect+0x2a8/0xe60 net/ipv4/af_inet.c:676 inet_stream_connect+0x66/0xa0 net/ipv4/af_inet.c:747 __sys_connect_file net/socket.c:2057 [inline] __sys_connect+0x397/0x420 net/socket.c:2074 __do_sys_connect net/socket.c:2084 [inline] __se_sys_connect net/socket.c:2081 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2081 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f5e36b8ebe9 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:00007f5e37990038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f5e36db5fa0 RCX: 00007f5e36b8ebe9 RDX: 0000000000000010 RSI: 0000200000000000 RDI: 0000000000000003 RBP: 00007f5e36c11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5e36db6038 R14: 00007f5e36db5fa0 R15: 00007fffc7759388 Allocated by task 8270: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767 slab_alloc_node mm/slub.c:3485 [inline] slab_alloc mm/slub.c:3493 [inline] __kmem_cache_alloc_lru mm/slub.c:3500 [inline] kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3509 kmem_cache_zalloc include/linux/slab.h:711 [inline] xfrm_state_alloc+0x22/0x2a0 net/xfrm/xfrm_state.c:661 __find_acq_core+0x7d8/0x19d0 net/xfrm/xfrm_state.c:1598 xfrm_find_acq+0x6a/0x90 net/xfrm/xfrm_state.c:2070 xfrm_alloc_userspi+0x57a/0xa90 net/xfrm/xfrm_user.c:1613 xfrm_user_rcv_msg+0x596/0x870 net/xfrm/xfrm_user.c:3169 netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2545 xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3191 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x5bf/0x950 net/socket.c:2595 ___sys_sendmsg+0x220/0x290 net/socket.c:2649 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2687 [inline] __se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88805cd00400 which belongs to the cache xfrm_state of size 848 The buggy address is located 760 bytes inside of freed 848-byte region [ffff88805cd00400, ffff88805cd00750) The buggy address belongs to the physical page: page:ffffea0001734000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88805cd00400 pfn:0x5cd00 head:ffffea0001734000 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888145653c80 dead000000000122 0000000000000000 raw: ffff88805cd00400 000000008010000e 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x152820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 8190, tgid 8190 (syz.0.678), ts 196768074168, free_ts 193799163796 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554 prep_new_page mm/page_alloc.c:1561 [inline] get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457 alloc_slab_page+0x5d/0x170 mm/slub.c:1876 allocate_slab mm/slub.c:2023 [inline] new_slab+0x87/0x2e0 mm/slub.c:2076 ___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230 __slab_alloc mm/slub.c:3329 [inline] __slab_alloc_node mm/slub.c:3382 [inline] slab_alloc_node mm/slub.c:3475 [inline] slab_alloc mm/slub.c:3493 [inline] __kmem_cache_alloc_lru mm/slub.c:3500 [inline] kmem_cache_alloc+0x1b7/0x2e0 mm/slub.c:3509 kmem_cache_zalloc include/linux/slab.h:711 [inline] xfrm_state_alloc+0x22/0x2a0 net/xfrm/xfrm_state.c:661 xfrm_state_find+0x2944/0x4510 net/xfrm/xfrm_state.c:1303 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2502 [inline] xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:2547 [inline] xfrm_resolve_and_create_bundle+0x727/0x2c20 net/xfrm/xfrm_policy.c:2841 xfrm_bundle_lookup net/xfrm/xfrm_policy.c:3076 [inline] xfrm_lookup_with_ifid+0x556/0x19c0 net/xfrm/xfrm_policy.c:3207 xfrm_lookup net/xfrm/xfrm_policy.c:3304 [inline] xfrm_lookup_route+0x3c/0x1b0 net/xfrm/xfrm_policy.c:3315 ip6_datagram_dst_update+0x71e/0xc70 net/ipv6/datagram.c:95 release_sock+0xb3/0x1c0 net/core/sock.c:3548 udpv6_destroy_sock+0xd3/0x230 net/ipv6/udp.c:1679 sk_common_release+0x6f/0x310 net/core/sock.c:3728 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1154 [inline] free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429 discard_slab mm/slub.c:2122 [inline] __unfreeze_partials+0x1cf/0x210 mm/slub.c:2662 put_cpu_partial+0x17c/0x250 mm/slub.c:2738 __slab_free+0x31d/0x410 mm/slub.c:3686 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767 slab_alloc_node mm/slub.c:3485 [inline] slab_alloc mm/slub.c:3493 [inline] __kmem_cache_alloc_lru mm/slub.c:3500 [inline] kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3509 ptlock_alloc mm/memory.c:6155 [inline] ptlock_init include/linux/mm.h:2909 [inline] pmd_ptlock_init include/linux/mm.h:3009 [inline] pagetable_pmd_ctor include/linux/mm.h:3047 [inline] pmd_alloc_one include/asm-generic/pgalloc.h:137 [inline] __pmd_alloc+0x116/0x880 mm/memory.c:5577 pmd_alloc include/linux/mm.h:2808 [inline] __handle_mm_fault mm/memory.c:5127 [inline] handle_mm_fault+0xb3d/0x4920 mm/memory.c:5331 do_user_addr_fault+0xad0/0x12e0 arch/x86/mm/fault.c:1324 handle_page_fault arch/x86/mm/fault.c:1465 [inline] exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608 Memory state around the buggy address: ffff88805cd00580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805cd00600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805cd00680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805cd00700: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ffff88805cd00780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================