================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x5b0/0x660 net/xfrm/xfrm_policy.c:874 Read of size 1 at addr ffff88811705eb98 by task syz.2.16/560 CPU: 0 PID: 560 Comm: syz.2.16 Not tainted 5.15.176-syzkaller-00033-g1e5cc8d5b121 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106 print_address_description+0x87/0x3a0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x177/0x1c0 mm/kasan/report.c:451 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 xfrm_policy_inexact_list_reinsert+0x5b0/0x660 net/xfrm/xfrm_policy.c:874 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:1006 [inline] xfrm_policy_inexact_insert_node+0x917/0xb00 net/xfrm/xfrm_policy.c:1062 xfrm_policy_inexact_alloc_chain+0x4e3/0xae0 net/xfrm/xfrm_policy.c:1178 xfrm_policy_inexact_insert+0x6a/0x1140 net/xfrm/xfrm_policy.c:1221 xfrm_policy_insert+0xde/0x9a0 net/xfrm/xfrm_policy.c:1602 xfrm_add_policy+0x4f2/0x980 net/xfrm/xfrm_user.c:1833 xfrm_user_rcv_msg+0x5f8/0x910 net/xfrm/xfrm_user.c:2979 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2489 xfrm_netlink_rcv+0x72/0x90 net/xfrm/xfrm_user.c:3001 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x8e5/0xad0 net/netlink/af_netlink.c:1337 netlink_sendmsg+0xa0c/0xd20 net/netlink/af_netlink.c:1905 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/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fdd0c84eda9 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:00007fdd0c2c1038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fdd0ca67fa0 RCX: 00007fdd0c84eda9 RDX: 0000000000004000 RSI: 0000000020000580 RDI: 0000000000000005 RBP: 00007fdd0c8d02a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fdd0ca67fa0 R15: 00007ffc45c528d8 Allocated by task 560: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:513 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc+0x13a/0x270 mm/slub.c:4407 kmalloc include/linux/slab.h:596 [inline] sk_prot_alloc+0xf8/0x220 net/core/sock.c:1866 sk_alloc+0x38/0x430 net/core/sock.c:1919 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/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88811705e800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 920 bytes inside of 1024-byte region [ffff88811705e800, ffff88811705ec00) The buggy address belongs to the page: page:ffffea00045c1600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x117058 head:ffffea00045c1600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100041dc0 raw: 0000000000000000 0000000080100010 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 0x152a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 560, ts 52933179753, free_ts 52915754308 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x15d/0x170 mm/page_alloc.c:2420 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x3bb6/0x3c90 mm/page_alloc.c:4192 __alloc_pages+0x38a/0x7b0 mm/page_alloc.c:5465 allocate_slab mm/slub.c:1912 [inline] new_slab+0x92/0x490 mm/slub.c:1975 ___slab_alloc+0x39e/0x830 mm/slub.c:3008 __slab_alloc+0x4a/0x90 mm/slub.c:3095 slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc_trace+0x142/0x210 mm/slub.c:3245 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] xfrm_policy_alloc+0x7d/0x290 net/xfrm/xfrm_policy.c:413 xfrm_compile_policy+0x805/0xd10 net/xfrm/xfrm_user.c:3340 xfrm_user_policy+0x3c2/0x720 net/xfrm/xfrm_state.c:2463 do_ipv6_setsockopt net/ipv6/ipv6_sockglue.c:945 [inline] ipv6_setsockopt+0x124b/0x4220 net/ipv6/ipv6_sockglue.c:1009 udpv6_setsockopt+0x8c/0xa0 net/ipv6/udp.c:1684 sock_common_setsockopt+0xa2/0xc0 net/core/sock.c:3448 __sys_setsockopt+0x4dc/0x840 net/socket.c:2203 __do_sys_setsockopt net/socket.c:2214 [inline] __se_sys_setsockopt net/socket.c:2211 [inline] __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2211 x64_sys_call+0x1a2/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:55 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1413 [inline] free_unref_page_prepare+0x7a9/0x7e0 mm/page_alloc.c:3317 free_unref_page+0x85/0x220 mm/page_alloc.c:3396 free_the_page mm/page_alloc.c:705 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5541 __free_slab+0xec/0x1d0 mm/slub.c:2000 free_slab mm/slub.c:2015 [inline] discard_slab+0x29/0x40 mm/slub.c:2021 __slab_free+0x205/0x290 mm/slub.c:3404 do_slab_free mm/slub.c:3487 [inline] ___cache_free+0x109/0x120 mm/slub.c:3506 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x44/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x15a/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0xf5/0x200 mm/slub.c:3233 kmem_cache_alloc_node include/linux/slab.h:462 [inline] __alloc_skb+0xbe/0x550 net/core/skbuff.c:415 alloc_skb include/linux/skbuff.h:1162 [inline] nlmsg_new include/net/netlink.h:953 [inline] inet6_netconf_notify_devconf+0xdd/0x190 net/ipv6/addrconf.c:583 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7124 [inline] addrconf_sysctl_unregister net/ipv6/addrconf.c:7148 [inline] addrconf_ifdown+0x17cd/0x1ae0 net/ipv6/addrconf.c:3931 Memory state around the buggy address: ffff88811705ea80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811705eb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811705eb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88811705ec00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811705ec80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================