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BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff888111ea542a by task modprobe/22690

CPU: 1 UID: 0 PID: 22690 Comm: modprobe Not tainted 6.17.0-rc1-syzkaller-00201-g88250d40ed59-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+0xca/0x240
 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:__might_resched+0x67/0x610
Code: 00 00 00 fc ff df 48 c7 44 24 40 b3 8a b5 41 48 c7 44 24 48 f9 1f 95 8d 48 c7 44 24 50 20 a2 91 81 48 8d 5c 24 40 48 c1 eb 03 <48> b8 f1 f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 09 f2 f2 f2
RSP: 0000:ffffc900070379e0 EFLAGS: 00000a06
RAX: 6b79f302de89d200 RBX: 1ffff92000e06f44 RCX: ffffffff82101a12
RDX: 0000000000000000 RSI: 0000000000000635 RDI: ffffffff8b8aec20
RBP: ffffc90007037af0 R08: ffff88810c6ab1b3 R09: 1ffff110218d5636
R10: dffffc0000000000 R11: ffffed10218d5637 R12: 1ffff92000e06f60
R13: dffffc0000000000 R14: ffffc90007037b20 R15: dffffc0000000000
 down_write+0x76/0x1f0
 __anon_vma_prepare+0x21c/0x4a0
 __handle_mm_fault+0x4b2d/0x5440
 handle_mm_fault+0x40a/0x8e0
 do_user_addr_fault+0xa81/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7f65da02bd1c
Code: 75 17 31 ff 48 89 14 24 e8 fc f2 ff ff 48 8b 14 24 48 85 c0 74 64 45 31 f6 48 29 d0 48 89 15 eb 9d 12 00 4c 01 f0 48 83 c8 01 <48> 89 42 08 4c 01 35 01 a6 12 00 48 85 db 74 40 48 83 eb 20 48 83
RSP: 002b:00007ffcd557d880 EFLAGS: 00010202
RAX: 0000000000021001 RBX: 0000000000000000 RCX: 000055cb3e686000
RDX: 000055cb3e665000 RSI: 0000000000000000 RDI: 000055cb3e686000
RBP: 00007f65da155aa0 R08: 0000000000000000 R09: 00007f65da155d80
R10: 0000000000000037 R11: 0000000000000206 R12: 00007f65da155b00
R13: 0000000000000290 R14: 0000000000000000 R15: 000055cb3e665000
 </TASK>

Allocated by task 21913:
 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_connect+0x5ba/0xd50
 sctp_getsockopt_connectx3+0x2c4/0x440
 sctp_getsockopt+0x98a/0xb60
 do_sock_getsockopt+0x372/0x450
 __x64_sys_getsockopt+0x1a5/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 21913:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 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 ffff888111ea5400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff888111ea5400, ffff888111ea5600)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888111ea5c00 pfn:0x111ea4
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 ffffea0004293610 ffffea0004257c10
raw: ffff888111ea5c00 000000000010000a 00000000f5000000 0000000000000000
head: 057ff00000000240 ffff88801a441c80 ffffea0004293610 ffffea0004257c10
head: ffff888111ea5c00 000000000010000a 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea000447a901 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 5885, tgid 5885 (syz-executor), ts 59896837903, free_ts 59835425406
 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_cache_noprof+0x296/0x3d0
 __ipv6_dev_mc_inc+0x44f/0xa50
 ipv6_add_dev+0xe63/0x1370
 addrconf_notify+0x794/0x1010
 notifier_call_chain+0x1b6/0x3e0
 register_netdevice+0x1608/0x1ae0
 rtnl_newlink_create+0x310/0xb00
 rtnl_newlink+0x16d6/0x1c70
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
page last free pid 5882 tgid 5882 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 stack_depot_save_flags+0x436/0x860
 kasan_save_track+0x4f/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x27a/0x4f0
 __register_sysctl_table+0xba1/0x1340
 mpls_dev_sysctl_register+0x188/0x270
 mpls_dev_notify+0x357/0x7a0
 notifier_call_chain+0x1b6/0x3e0
 register_netdevice+0x1608/0x1ae0
 veth_newlink+0x5cc/0xa50
 rtnl_newlink_create+0x310/0xb00
 rtnl_newlink+0x16d6/0x1c70
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x82f/0x9e0

Memory state around the buggy address:
 ffff888111ea5300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888111ea5380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888111ea5400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff888111ea5480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888111ea5500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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