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BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff88802a2cb82a by task modprobe/21873

CPU: 0 UID: 0 PID: 21873 Comm: modprobe 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:kasan_check_range+0x1dc/0x2c0
Code: 85 e4 49 0f 49 dc 48 83 e3 f8 49 29 dc 74 12 41 80 3b 00 0f 85 b8 00 00 00 49 ff c3 49 ff cc 75 ee 5b 41 5c 41 5d 41 5e 41 5f <5d> c3 cc cc cc cc cc 45 84 ff 75 63 41 f7 c7 00 ff 00 00 75 5f 41
RSP: 0000:ffffc900074479f0 EFLAGS: 00000256
RAX: ffffffff81f5e001 RBX: ffffea00004a2974 RCX: ffffffff81f6c85b
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffea00004a2974
RBP: ffffc90007447bd0 R08: ffffea00004a2977 R09: 1ffffd400009452e
R10: dffffc0000000000 R11: fffff9400009452f R12: ffffea00004a2940
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000001000
 filemap_map_pages+0xf8b/0x1740
 __handle_mm_fault+0x368a/0x5620
 handle_mm_fault+0x40a/0x8e0
 do_user_addr_fault+0xa81/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7f2766db8408
Code: Unable to access opcode bytes at 0x7f2766db83de.
RSP: 002b:00007fffee9044a8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00007f2767049f00 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f2766dc2068
RBP: 0000000000000002 R08: 0000000000000000 R09: 000000000000000d
R10: 00007fffee904180 R11: 0000000000000246 R12: 0000000000000004
R13: 00007fffee904548 R14: 00007fffee904570 R15: 0000000000000000
 </TASK>

Allocated by task 21688:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 rfcomm_dlc_alloc+0x75/0x410
 rfcomm_sock_alloc+0x23/0x210
 rfcomm_sock_create+0xc2/0x2d0
 bt_sock_create+0x163/0x240
 __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 21687:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kfree+0x18e/0x440
 __sk_destruct+0x89/0x660
 rfcomm_sock_release+0xd8/0x120
 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 ffff88802a2cb800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff88802a2cb800, ffff88802a2cba00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802a2cb800 pfn:0x2a2c8
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 ffffea0000c84a10 ffffea0000ee2810
raw: ffff88802a2cb800 0000000000100009 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801a441c80 ffffea0000c84a10 ffffea0000ee2810
head: ffff88802a2cb800 0000000000100009 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000a8b201 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 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 10808, tgid 10807 (syz.0.2170), ts 125332962573, free_ts 119021275106
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 allocate_slab+0x65/0x3b0
 ___slab_alloc+0xbfc/0x1480
 __kmalloc_node_noprof+0x2fd/0x4e0
 allocate_slab+0x17c/0x3b0
 ___slab_alloc+0xbfc/0x1480
 kmem_cache_alloc_noprof+0x283/0x3c0
 __send_signal_locked+0x22a/0xeb0
 group_send_sig_info+0x1fd/0x260
 do_bpf_send_signal+0xa9/0x1e0
 irq_work_single+0xe1/0x240
 irq_work_run+0x155/0x2f0
 __sysvec_irq_work+0xa8/0x3d0
 sysvec_irq_work+0x9e/0xc0
page last free pid 24 tgid 24 stack trace:
 __free_frozen_pages+0xc71/0xe70
 pcpu_depopulate_chunk+0x45f/0x500
 pcpu_balance_workfn+0x350/0xe00
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30

Memory state around the buggy address:
 ffff88802a2cb700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802a2cb780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802a2cb800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88802a2cb880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802a2cb900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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