================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x5b0/0x660 net/xfrm/xfrm_policy.c:853 Read of size 1 at addr ffff88811b1a4bf8 by task syz.1.2956/12079 CPU: 1 PID: 12079 Comm: syz.1.2956 Tainted: G W 5.15.180-syzkaller-android13-5.15.180_r00 #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+0x151/0x1c0 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:444 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 xfrm_policy_inexact_list_reinsert+0x5b0/0x660 net/xfrm/xfrm_policy.c:853 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:985 [inline] xfrm_policy_inexact_insert_node+0x917/0xb00 net/xfrm/xfrm_policy.c:1041 xfrm_policy_inexact_alloc_chain+0x4ec/0xaf0 net/xfrm/xfrm_policy.c:1157 xfrm_policy_inexact_insert+0x6a/0x1160 net/xfrm/xfrm_policy.c:1200 xfrm_policy_insert+0xe7/0x940 net/xfrm/xfrm_policy.c:1583 xfrm_add_policy+0x4f2/0x980 net/xfrm/xfrm_user.c:1832 xfrm_user_rcv_msg+0x4f3/0x7d0 net/xfrm/xfrm_user.c:2981 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2493 xfrm_netlink_rcv+0x72/0x90 net/xfrm/xfrm_user.c:3003 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline] netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1341 netlink_sendmsg+0xa0a/0xd20 net/netlink/af_netlink.c:1909 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 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2526 x64_sys_call+0x16a/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 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: 0033:0x7f60f0c7f169 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:00007f60ef2e8038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f60f0ea6fa0 RCX: 00007f60f0c7f169 RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000006 RBP: 00007f60f0d01a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f60f0ea6fa0 R15: 00007ffec02a58a8 Allocated by task 12079: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:512 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc+0x13f/0x2c0 mm/slub.c:4431 kmalloc include/linux/slab.h:621 [inline] sk_prot_alloc+0xf9/0x330 net/core/sock.c:1868 sk_alloc+0x38/0x430 net/core/sock.c:1925 pfkey_create+0x12c/0x620 net/key/af_key.c:152 __sock_create+0x3be/0x7e0 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+0x7a/0x90 net/socket.c:1591 x64_sys_call+0x147/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:42 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 ffff88811b1a4800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 1016 bytes inside of 1024-byte region [ffff88811b1a4800, ffff88811b1a4c00) The buggy address belongs to the page: page:ffffea00046c6800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11b1a0 head:ffffea00046c6800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 9906, ts 657668055661, free_ts 464359614182 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5781 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1932 [inline] new_slab+0x9a/0x4e0 mm/slub.c:1995 ___slab_alloc+0x39e/0x830 mm/slub.c:3028 __slab_alloc+0x4a/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3250 [inline] __kmalloc_track_caller+0x171/0x2c0 mm/slub.c:4949 kmalloc_reserve net/core/skbuff.c:357 [inline] pskb_expand_head+0x113/0x1240 net/core/skbuff.c:1733 __skb_cow include/linux/skbuff.h:3398 [inline] skb_cow_head include/linux/skbuff.h:3432 [inline] ip_tunnel_xmit+0x162e/0x26a0 net/ipv4/ip_tunnel.c:815 __gre_xmit net/ipv4/ip_gre.c:474 [inline] ipgre_xmit+0x7f8/0xb80 net/ipv4/ip_gre.c:669 __netdev_start_xmit include/linux/netdevice.h:5064 [inline] netdev_start_xmit include/linux/netdevice.h:5078 [inline] xmit_one net/core/dev.c:3656 [inline] dev_hard_start_xmit+0x228/0x620 net/core/dev.c:3672 __dev_queue_xmit+0x1856/0x2e80 net/core/dev.c:4295 dev_queue_xmit+0x17/0x20 net/core/dev.c:4328 __bpf_tx_skb net/core/filter.c:2118 [inline] __bpf_redirect_no_mac net/core/filter.c:2152 [inline] __bpf_redirect+0x690/0xe60 net/core/filter.c:2175 ____bpf_clone_redirect net/core/filter.c:2444 [inline] bpf_clone_redirect+0x24d/0x390 net/core/filter.c:2414 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] __free_pages_ok+0x985/0xa50 mm/page_alloc.c:1772 free_the_page mm/page_alloc.c:807 [inline] __free_pages+0xe9/0xf0 mm/page_alloc.c:5857 free_nonslab_page+0x82/0xc0 mm/slub.c:3559 kfree+0x1a3/0x270 mm/slub.c:4580 p9_fcall_fini net/9p/client.c:252 [inline] p9_req_put+0xcf/0x180 net/9p/client.c:385 p9_tag_remove net/9p/client.c:379 [inline] p9_client_version net/9p/client.c:998 [inline] p9_client_create+0xb0b/0x1180 net/9p/client.c:1058 v9fs_session_init+0x1fa/0x19b0 fs/9p/v9fs.c:409 v9fs_mount+0x75/0x7f0 fs/9p/vfs_super.c:126 legacy_get_tree+0xf1/0x190 fs/fs_context.c:611 vfs_get_tree+0x88/0x290 fs/super.c:1530 do_new_mount+0x2ba/0xb30 fs/namespace.c:3012 path_mount+0x671/0x1070 fs/namespace.c:3342 do_mount fs/namespace.c:3355 [inline] __do_sys_mount fs/namespace.c:3563 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3540 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3540 x64_sys_call+0x49d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:80 Memory state around the buggy address: ffff88811b1a4a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811b1a4b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811b1a4b80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ^ ffff88811b1a4c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811b1a4c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================