================================================================== 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 ffff888060cec2f8 by task syz.3.873/8036 CPU: 1 PID: 8036 Comm: syz.3.873 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 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 vti_xmit net/ipv4/ip_vti.c:214 [inline] vti_tunnel_xmit+0x424/0x1770 net/ipv4/ip_vti.c:304 __netdev_start_xmit include/linux/netdevice.h:4943 [inline] netdev_start_xmit include/linux/netdevice.h:4957 [inline] xmit_one net/core/dev.c:3619 [inline] dev_hard_start_xmit+0x246/0x740 net/core/dev.c:3635 __dev_queue_xmit+0x1a64/0x35a0 net/core/dev.c:4425 dev_queue_xmit include/linux/netdevice.h:3113 [inline] __bpf_tx_skb+0x189/0x250 net/core/filter.c:2145 ____bpf_clone_redirect net/core/filter.c:2471 [inline] bpf_clone_redirect+0x270/0x3d0 net/core/filter.c:2441 bpf_prog_c9d58f5b8698340d+0x5e/0x63 bpf_dispatcher_nop_func include/linux/bpf.h:1213 [inline] __bpf_prog_run include/linux/filter.h:612 [inline] bpf_prog_run include/linux/filter.h:619 [inline] bpf_test_run+0x2c7/0x810 net/bpf/test_run.c:424 bpf_prog_test_run_skb+0xa67/0x11c0 net/bpf/test_run.c:1050 bpf_prog_test_run+0x321/0x390 kernel/bpf/syscall.c:4123 __sys_bpf+0x440/0x800 kernel/bpf/syscall.c:5485 __do_sys_bpf kernel/bpf/syscall.c:5571 [inline] __se_sys_bpf kernel/bpf/syscall.c:5569 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5569 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: 0033:0x7f46f218ebe9 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:00007f46f30ab038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f46f23b5fa0 RCX: 00007f46f218ebe9 RDX: 000000000000002c RSI: 0000200000000080 RDI: 000000000000000a RBP: 00007f46f2211e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f46f23b6038 R14: 00007f46f23b5fa0 R15: 00007ffd26f51dc8 Allocated by task 6225: 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 ffff888060cec000 which belongs to the cache xfrm_state of size 848 The buggy address is located 760 bytes inside of freed 848-byte region [ffff888060cec000, ffff888060cec350) The buggy address belongs to the physical page: page:ffffea0001833b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888060cec400 pfn:0x60cec head:ffffea0001833b00 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 ffff888141ad13c0 dead000000000122 0000000000000000 raw: ffff888060cec400 000000008010000f 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 6225, tgid 6224 (syz.3.138), ts 106777082795, free_ts 106459526883 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 __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 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_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc+0xb4/0x240 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] __d_alloc+0xb7/0x730 fs/dcache.c:1790 d_alloc fs/dcache.c:1853 [inline] d_alloc_parallel+0xdd/0x1480 fs/dcache.c:2644 __lookup_slow+0x117/0x3b0 fs/namei.c:1679 lookup_one_len+0x192/0x2c0 fs/namei.c:2744 start_creating+0x188/0x310 fs/debugfs/inode.c:376 debugfs_create_dir+0x28/0x4a0 fs/debugfs/inode.c:591 ocfs2_fill_super+0x3389/0x4d90 fs/ocfs2/super.c:1072 mount_bdev+0x22b/0x2d0 fs/super.c:1643 legacy_get_tree+0xea/0x180 fs/fs_context.c:662 vfs_get_tree+0x8c/0x280 fs/super.c:1764 Memory state around the buggy address: ffff888060cec180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888060cec200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888060cec280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888060cec300: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ffff888060cec380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================