================================================================== BUG: KASAN: slab-use-after-free in xfrm_state_lookup_spi_proto net/xfrm/xfrm_state.c:1477 [inline] BUG: KASAN: slab-use-after-free in xfrm_alloc_spi+0x598/0x11f0 net/xfrm/xfrm_state.c:2302 Read of size 4 at addr ffff888064a054a0 by task syz.0.4232/19095 CPU: 1 PID: 19095 Comm: syz.0.4232 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 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_spi_proto net/xfrm/xfrm_state.c:1477 [inline] xfrm_alloc_spi+0x598/0x11f0 net/xfrm/xfrm_state.c:2302 pfkey_getspi+0x79a/0xed0 net/key/af_key.c:1385 pfkey_process net/key/af_key.c:2847 [inline] pfkey_sendmsg+0xbed/0x1050 net/key/af_key.c:3698 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 RIP: 0033:0x7f2f7518eba9 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:00007f2f76046038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f2f753d6180 RCX: 00007f2f7518eba9 RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000000000000005 RBP: 00007f2f75211e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2f753d6218 R14: 00007f2f753d6180 R15: 00007ffc9de80ca8 Allocated by task 17387: 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:3495 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3519 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 ffff888064a05400 which belongs to the cache xfrm_state of size 848 The buggy address is located 160 bytes inside of freed 848-byte region [ffff888064a05400, ffff888064a05750) The buggy address belongs to the physical page: page:ffffea0001928100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x64a04 head:ffffea0001928100 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 ffff888147e458c0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080100010 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 14643, tgid 14640 (syz.0.2872), ts 764510251386, free_ts 764506585182 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:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x87/0x2e0 mm/slub.c:2081 ___slab_alloc+0xc6d/0x1300 mm/slub.c:3253 __slab_alloc mm/slub.c:3339 [inline] __slab_alloc_node mm/slub.c:3392 [inline] slab_alloc_node mm/slub.c:3485 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc+0x1b7/0x2e0 mm/slub.c:3519 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_lookup_with_ifid+0x261/0x19c0 net/xfrm/xfrm_policy.c:3175 xfrm_lookup net/xfrm/xfrm_policy.c:3304 [inline] xfrm_lookup_route+0x3c/0x1b0 net/xfrm/xfrm_policy.c:3315 udp_sendmsg+0x15cf/0x2380 net/ipv4/udp.c:1236 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_sendmmsg+0x275/0x4a0 net/socket.c:2735 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 __stack_depot_save+0x572/0x630 lib/stackdepot.c:443 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x5f/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:3495 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3519 kmem_cache_zalloc include/linux/slab.h:711 [inline] fill_pool lib/debugobjects.c:169 [inline] debug_objects_fill_pool+0x4f5/0x6b0 lib/debugobjects.c:616 debug_object_activate+0x36/0x4b0 lib/debugobjects.c:705 debug_rcu_head_queue kernel/rcu/rcu.h:227 [inline] __call_rcu_common kernel/rcu/tree.c:2706 [inline] call_rcu+0xab/0x930 kernel/rcu/tree.c:2837 mas_wr_node_store lib/maple_tree.c:3995 [inline] mas_wr_modify+0x231b/0x29f0 lib/maple_tree.c:4229 mas_store_prealloc+0x227/0x3c0 lib/maple_tree.c:5461 __mmap_region mm/mmap.c:2848 [inline] mmap_region+0x139b/0x2020 mm/mmap.c:2941 do_mmap+0x92f/0x10a0 mm/mmap.c:1385 vm_mmap_pgoff+0x1c0/0x400 mm/util.c:556 elf_map+0xfd/0x2f0 fs/binfmt_elf.c:376 Memory state around the buggy address: ffff888064a05380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888064a05400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888064a05480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888064a05500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888064a05580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================