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BUG: KASAN: slab-out-of-bounds in xfrm_state_find+0x2cf2/0x5400
Read of size 1 at addr ffff88802953c330 by task syz.2.1616/9637

CPU: 1 UID: 0 PID: 9637 Comm: syz.2.1616 Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 xfrm_state_find+0x2cf2/0x5400
 xfrm_resolve_and_create_bundle+0x768/0x2f80
 xfrm_lookup_with_ifid+0x2a7/0x1a70
 xfrm_lookup_route+0x3c/0x1c0
 udp_sendmsg+0x142e/0x2170
 __sock_sendmsg+0x19c/0x270
 ____sys_sendmsg+0x52d/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __sys_sendmmsg+0x227/0x430
 __x64_sys_sendmmsg+0xa0/0xc0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f520fb8ebe9
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:00007f5210a63038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f520fdb5fa0 RCX: 00007f520fb8ebe9
RDX: 0400000000000077 RSI: 0000200000000180 RDI: 0000000000000003
RBP: 00007f520fc11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000007600 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f520fdb6038 R14: 00007f520fdb5fa0 R15: 00007ffcd3cc1fa8
 </TASK>

Allocated by task 5283:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_node_track_caller_noprof+0x271/0x4e0
 kmalloc_reserve+0x136/0x290
 __alloc_skb+0x142/0x2d0
 alloc_skb_with_frags+0xca/0x890
 sock_alloc_send_pskb+0x857/0x990
 unix_dgram_sendmsg+0x461/0x1850
 __sock_sendmsg+0x21c/0x270
 __sys_sendto+0x3bd/0x520
 __x64_sys_sendto+0xde/0x100
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5276:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kfree+0x18e/0x440
 skb_release_data+0x62d/0x7c0
 consume_skb+0x9e/0xf0
 __unix_dgram_recvmsg+0x9f9/0xd60
 sock_recvmsg+0x22c/0x270
 sock_read_iter+0x231/0x2f0
 vfs_read+0x4d0/0x980
 ksys_read+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802953c000
 which belongs to the cache kmalloc-cg-512 of size 512
The buggy address is located 304 bytes to the right of
 allocated 512-byte region [ffff88802953c000, ffff88802953c200)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802953c000 pfn:0x2953c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88803c87ec01
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801a44b140 ffffea0000eb2610 ffffea0000eba210
raw: ffff88802953c000 0000000000100001 00000000f5000000 ffff88803c87ec01
head: 00fff00000000240 ffff88801a44b140 ffffea0000eb2610 ffffea0000eba210
head: ffff88802953c000 0000000000100001 00000000f5000000 ffff88803c87ec01
head: 00fff00000000002 ffffea0000a54f01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5283, tgid 5283 (klogd), ts 115230517839, free_ts 115014178469
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x370
 ___slab_alloc+0xbeb/0x1410
 __kmalloc_node_track_caller_noprof+0x2f8/0x4e0
 kmalloc_reserve+0x136/0x290
 __alloc_skb+0x142/0x2d0
 alloc_skb_with_frags+0xca/0x890
 sock_alloc_send_pskb+0x857/0x990
 unix_dgram_sendmsg+0x461/0x1850
 __sock_sendmsg+0x21c/0x270
 __sys_sendto+0x3bd/0x520
 __x64_sys_sendto+0xde/0x100
 do_syscall_64+0xfa/0x3b0
page last free pid 9035 tgid 9034 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 stack_depot_save_flags+0x436/0x860
 kasan_save_track+0x4f/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 dst_alloc+0x105/0x170
 ip6_pol_route+0xa21/0x1180
 fib6_rule_lookup+0x1fc/0x6f0
 ip6_route_output_flags+0x364/0x5d0
 icmpv6_rt_has_prefsrc+0x4f/0x3e0
 icmp6_send+0xd56/0x1940
 ip6_pkt_drop+0x53d/0x620
 ip6_pkt_discard_out+0xf2/0x120
 ip6_xmit+0x107a/0x1840
 sctp_v6_xmit+0xa33/0x1300
 sctp_packet_transmit+0x2581/0x2bb0

Memory state around the buggy address:
 ffff88802953c200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802953c280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802953c300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                     ^
 ffff88802953c380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802953c400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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