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BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff8881107d542a by task syz.3.3404/17898

CPU: 1 UID: 0 PID: 17898 Comm: syz.3.3404 Not tainted 6.16.0-rc5-syzkaller-00212-g9f735b6f8a77-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:
 <IRQ>
 dump_stack_lvl+0x189/0x250
 print_report+0xd2/0x2b0
 kasan_report+0x118/0x150
 rose_timer_expiry+0x471/0x4b0
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0x175/0x360
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 9b 60 01 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90006887848 EFLAGS: 00000206
RAX: 541f9b4459d6b600 RBX: 0000000000000000 RCX: 541f9b4459d6b600
RDX: 0000000000000000 RSI: ffffffff8db83841 RDI: ffffffff8be28c40
RBP: ffffffff820ab750 R08: 0000000000000000 R09: ffffffff820ab750
R10: ffffc900068879d0 R11: fffff52000d10f3e R12: 0000000000000001
R13: ffff888024718be0 R14: 0000000000000001 R15: 0000000000000246
 __might_fault+0xcc/0x130
 copy_fpstate_to_sigframe+0xa88/0xce0
 get_sigframe+0x58d/0x7d0
 x64_setup_rt_frame+0x15b/0xd40
 arch_do_signal_or_restart+0x3d7/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5bd184f830
Code: 10 83 e0 01 83 e2 01 88 15 c2 5e e9 00 88 05 bf 5e e9 00 c3 50 48 8d 35 41 15 1c 00 48 8d 3d 47 15 1c 00 31 c0 e8 30 f7 ff ff <53> 89 fb 48 83 ec 10 64 8b 04 25 94 ff ff ff 85 c0 74 2a 89 fe 31
RSP: 002b:00007f5bd280b378 EFLAGS: 00000297
RAX: 0000000000000000 RBX: 00007f5bd280bd30 RCX: 0000000000000999
RDX: 00007f5bd280b380 RSI: 00007f5bd280b4b0 RDI: 000000000000000b
RBP: 000000000000000b R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000073
R13: 00007f5bd280beb0 R14: 9999999999999999 R15: 0000000000000000
 </TASK>

Allocated by task 17352:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 __genradix_ptr_alloc+0x352/0x4a0
 __genradix_prealloc+0x44/0x90
 sctp_stream_init+0x14b/0x440
 sctp_association_new+0x10dd/0x25f0
 sctp_connect_new_asoc+0x2c5/0x690
 sctp_sendmsg+0x155c/0x2810
 __sock_sendmsg+0x19c/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 17352:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kfree+0x18e/0x440
 genradix_free_recurse+0x5d/0xa0
 genradix_free_recurse+0x5d/0xa0
 sctp_stream_free+0xd5/0x110
 sctp_association_free+0x26d/0x7f0
 sctp_do_sm+0x3eba/0x5a20
 sctp_primitive_SHUTDOWN+0x98/0xc0
 sctp_close+0x409/0x900
 inet_release+0x144/0x190
 sock_close+0xc3/0x240
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 get_signal+0x11ed/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8881107d5400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff8881107d5400, ffff8881107d5600)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8881107d6000 pfn:0x1107d4
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000240(workingset|head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000240 ffff88801a441c80 ffffea00043b5510 ffffea00042ab310
raw: ffff8881107d6000 000000000010000c 00000000f5000000 0000000000000000
head: 057ff00000000240 ffff88801a441c80 ffffea00043b5510 ffffea00042ab310
head: ffff8881107d6000 000000000010000c 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea000441f501 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 5845, tgid 5845 (syz-executor), ts 66704497451, free_ts 66681735400
 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/0x3b0
 ___slab_alloc+0xbfc/0x1480
 __kmalloc_noprof+0x305/0x4f0
 fib6_info_alloc+0x30/0xf0
 ip6_route_info_create+0x142/0x860
 ip6_route_add+0x49/0x1b0
 inet6_addr_add+0x6b2/0xc00
 inet6_rtm_newaddr+0x93d/0xd20
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x75c/0x8e0
 netlink_sendmsg+0x805/0xb30
page last free pid 5850 tgid 5850 stack trace:
 __free_frozen_pages+0xc71/0xe70
 __put_partials+0x161/0x1c0
 put_cpu_partial+0x17c/0x250
 __slab_free+0x2f7/0x400
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 __alloc_skb+0x112/0x2d0
 inet6_ifmcaddr_notify+0xeb/0x1d0
 __ipv6_dev_mc_inc+0x916/0xaf0
 addrconf_dad_work+0x3d0/0x14b0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770

Memory state around the buggy address:
 ffff8881107d5300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881107d5380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881107d5400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff8881107d5480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881107d5500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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