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BUG: KASAN: use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff88810f4b402a by task modprobe/15951

CPU: 1 UID: 0 PID: 15951 Comm: modprobe Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-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:filemap_fault+0xf5/0x1200
Code: 3c 20 00 74 08 48 89 df e8 a8 e1 2b 00 4c 8b 2b 4c 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ef e8 8f e1 2b 00 49 8b 5d 00 <4d> 8d 77 10 4c 89 f0 48 c1 e8 03 48 89 44 24 20 42 80 3c 20 00 74
RSP: 0000:ffffc9000d15fa80 EFLAGS: 00000246
RAX: 1ffff11003b96dbd RBX: ffff88801dcb6bc8 RCX: ffff88801fa18000
RDX: 0000000000000000 RSI: 00000001063e3007 RDI: ffffc9000d15fce0
RBP: ffffc9000d15fbb8 R08: ffffffff99c79027 R09: 1ffffffff338f204
R10: dffffc0000000000 R11: ffffffff81f733d0 R12: dffffc0000000000
R13: ffff88801dcb6de8 R14: ffffffff8b9e53a8 R15: ffffc9000d15fce0
 __do_fault+0x138/0x390
 __handle_mm_fault+0x1719/0x5440
 handle_mm_fault+0x40a/0x8e0
 do_user_addr_fault+0xa81/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7ff260efe105
Code: 47 d6 4d 89 d7 4d 39 d0 73 7f 44 89 d8 83 e0 02 89 85 f4 fe ff ff 74 3e 4c 89 f9 31 c0 4c 89 c7 4c 29 c1 83 bd f4 fe ff ff 00 <f3> aa 75 5b 48 8b 35 88 79 02 00 44 89 da 44 89 9d f4 fe ff ff 48
RSP: 002b:00007ffe1e465450 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 00007ffe1e4654f8 RCX: 0000000000000958
RDX: 0000000000000003 RSI: 0000000000001000 RDI: 00007ff260e1c6a8
RBP: 00007ffe1e465be0 R08: 00007ff260e1c6a8 R09: 000000000019d000
R10: 00007ff260e1d000 R11: 0000000000000003 R12: 00007ff260eed500
R13: 00007ffe1e465c68 R14: 00007ff260e29dd0 R15: 00007ff260e1d000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88810f4b7c00 pfn:0x10f4b4
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: ffff88810f4b7c00 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5862, tgid 5862 (syz-executor), ts 244793142424, free_ts 248830949462
 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_noprof+0x305/0x4f0
 tomoyo_realpath_from_path+0xe3/0x5d0
 tomoyo_path_perm+0x213/0x4b0
 security_inode_getattr+0x12f/0x330
 vfs_statx+0x18e/0x550
 vfs_fstatat+0x118/0x170
 __x64_sys_newfstatat+0x116/0x190
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5862 tgid 5862 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 __put_partials+0x156/0x1a0
 put_cpu_partial+0x17c/0x250
 __slab_free+0x2d5/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 getname_flags+0xb8/0x540
 user_path_at+0x24/0x60
 __x64_sys_umount+0xee/0x160
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88810f4b3f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88810f4b3f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88810f4b4000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                  ^
 ffff88810f4b4080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88810f4b4100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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