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BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff8880379f842a by task syz.1.4046/21505

CPU: 1 UID: 0 PID: 21505 Comm: syz.1.4046 Not tainted 6.16.0-rc6-syzkaller-00135-gcf074eca0065 #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/0x230
 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:console_flush_all+0x7f7/0xc40
Code: 48 21 c3 0f 85 e9 01 00 00 e8 75 e7 1e 00 48 8b 5c 24 20 4d 85 f6 75 07 e8 66 e7 1e 00 eb 06 e8 5f e7 1e 00 fb 48 8b 44 24 28 <42> 80 3c 20 00 74 08 48 89 df e8 ca f8 80 00 48 8b 1b 48 8b 44 24
RSP: 0018:ffffc90006c56a60 EFLAGS: 00000293
RAX: 1ffffffff1d366f7 RBX: ffffffff8e9b37b8 RCX: ffff88801f9a1cc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90006c56bb0 R08: ffffffff8fa1d6f7 R09: 1ffffffff1f43ade
R10: dffffc0000000000 R11: fffffbfff1f43adf R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000200 R15: ffffffff8e9b3760
 console_unlock+0xc4/0x270
 vprintk_emit+0x5b7/0x7a0
 _printk+0xcf/0x120
 __nla_validate_parse+0x1719/0x2d40
 __nla_parse+0x40/0x60
 neigh_dump_info+0x2f4/0x1990
 netlink_dump+0x6de/0xe60
 __netlink_dump_start+0x5cb/0x7e0
 rtnetlink_rcv_msg+0x9eb/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x75c/0x8e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1f7858e9a9
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:00007f1f7946a038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1f787b6080 RCX: 00007f1f7858e9a9
RDX: 0000000000000000 RSI: 00002000000009c0 RDI: 000000000000000a
RBP: 00007f1f78610d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1f787b6080 R15: 00007ffe36330fb8
 </TASK>

Allocated by task 21355:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 sctp_endpoint_new+0x86/0xa20
 sctp_init_sock+0x960/0x11f0
 sctp_v6_init_sock+0x16/0x70
 inet6_create+0xef4/0x1260
 __sock_create+0x4b3/0x9f0
 __sys_socket+0xd7/0x1b0
 __x64_sys_socket+0x7a/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 23:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kfree+0x18e/0x440
 rcu_core+0xca8/0x1710
 handle_softirqs+0x286/0x870
 run_ksoftirqd+0x9b/0x100
 smpboot_thread_fn+0x542/0xa60
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30

Last potentially related work creation:
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 call_rcu+0x157/0x9c0
 sctp_destroy_sock+0x1ec/0x370
 sk_common_release+0x75/0x2e0
 sctp_close+0x783/0x900
 inet_release+0x144/0x190
 sock_close+0xc3/0x240
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 do_exit+0x6b5/0x22e0
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 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 ffff8880379f8400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff8880379f8400, ffff8880379f8600)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x379f8
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a441c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801a441c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000de7e01 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 5916, tgid 5913 (syz.2.7), ts 58575960481, free_ts 58571610744
 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_cache_noprof+0x296/0x3d0
 device_add+0xbe/0xb50
 netdev_register_kobject+0x156/0x2f0
 register_netdevice+0x126c/0x1ae0
 br_add_bridge+0xa3/0xf0
 br_ioctl_stub+0x526/0xc80
 sock_ioctl+0x4d8/0x790
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5912 tgid 5911 stack trace:
 __free_frozen_pages+0xc71/0xe70
 stack_depot_save_flags+0x445/0x900
 kasan_save_track+0x4f/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 sctp_inet6addr_event+0x37f/0x740
 notifier_call_chain+0x1b6/0x3e0
 atomic_notifier_call_chain+0xda/0x180
 ipv6_add_addr+0xda9/0x1090
 addrconf_add_linklocal+0x28c/0x6c0
 addrconf_addr_gen+0x490/0x580
 addrconf_init_auto_addrs+0x706/0xab0
 addrconf_notify+0xacc/0x1010
 notifier_call_chain+0x1b6/0x3e0
 __dev_notify_flags+0x18d/0x2e0
 rtnl_newlink_create+0x61c/0xb00

Memory state around the buggy address:
 ffff8880379f8300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880379f8380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880379f8400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff8880379f8480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880379f8500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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