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BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff88801e7dc82a by task syz.0.8251/24438

CPU: 0 UID: 0 PID: 24438 Comm: syz.0.8251 Not tainted 6.16.0-rc5-syzkaller-00212-g9f735b6f8a77 #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:htab_unlock_bucket+0x23a/0x2e0
Code: df ff e8 f9 3e 53 ff e9 74 ff ff ff e8 bf c4 df ff e8 7a f1 8c 09 48 85 db 74 c7 e8 b0 c4 df ff fb 48 c7 44 24 20 0e 36 e0 45 <48> 8b 44 24 18 4a c7 04 20 00 00 00 00 65 48 8b 05 71 38 bf 10 48
RSP: 0018:ffffc90004cbfa20 EFLAGS: 00000293
RAX: ffffffff81e06790 RBX: 0000000000000200 RCX: ffff8880496f0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004cbfae0 R08: ffffffff8fa1d5f7 R09: 1ffffffff1f43abe
R10: dffffc0000000000 R11: fffffbfff1f43abf R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88804b03b288
 htab_map_update_elem+0x588/0x830
 bpf_map_update_value+0x501/0x590
 generic_map_update_batch+0x5b5/0x7f0
 bpf_map_do_batch+0x36c/0x5f0
 __sys_bpf+0x384/0x860
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fed4c78e9a9
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:00007fed4d57f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fed4c9b5fa0 RCX: 00007fed4c78e9a9
RDX: 0000000000000038 RSI: 00002000000004c0 RDI: 000000000000001a
RBP: 00007fed4c810ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fed4c9b5fa0 R15: 00007ffec0927148
 </TASK>

Allocated by task 23827:
 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 23827:
 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 ffff88801e7dc800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff88801e7dc800, ffff88801e7dca00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88801e7df000 pfn:0x1e7dc
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801a441c80 ffffea0000a1ed10 ffffea0000f6a910
raw: ffff88801e7df000 0000000000100005 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801a441c80 ffffea0000a1ed10 ffffea0000f6a910
head: ffff88801e7df000 0000000000100005 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea000079f701 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5706, tgid 5706 (kworker/u8:2), ts 111417693132, free_ts 108500261568
 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
 batadv_forw_packet_alloc+0x1e9/0x390
 batadv_iv_ogm_queue_add+0x85f/0xd30
 batadv_iv_ogm_schedule+0x81c/0xea0
 batadv_iv_send_outstanding_bat_ogm_packet+0x6c6/0x7e0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
page last free pid 9493 tgid 9493 stack trace:
 __free_frozen_pages+0xc71/0xe70
 __tlb_remove_table+0x2d2/0x3b0
 tlb_remove_table_rcu+0x85/0x100
 rcu_core+0xca8/0x1710
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 common_interrupt+0xbb/0xe0
 asm_common_interrupt+0x26/0x40

Memory state around the buggy address:
 ffff88801e7dc700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801e7dc780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801e7dc800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88801e7dc880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801e7dc900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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