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BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff88801f7f142a by task syz.2.3204/15121

CPU: 1 UID: 0 PID: 15121 Comm: syz.2.3204 Not tainted 6.17.0-rc1-syzkaller-00207-g815957293639-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:post_alloc_hook+0x23b/0x2a0
Code: 0f 1e fa 4c 89 ef 44 89 fe e8 61 8a 0d 00 45 84 e4 0f 85 55 fe ff ff e9 7c fe ff ff f3 0f 1e fa 0f b7 f3 4c 89 ef 8b 54 24 04 <e8> c0 2a 17 00 e9 a6 fe ff ff f3 0f 1e fa 4c 89 ef 89 de e8 bd eb
RSP: 0018:ffffc900064bf478 EFLAGS: 00000256
RAX: ffff8880285a3980 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000100cc0 RSI: 0000000000000000 RDI: ffffea00047e1500
RBP: 1ffffffff1b7ac8f R08: ffffffff8fa37e37 R09: 0000000000000000
R10: ffffed1023f0a800 R11: fffffbfff1f46fc7 R12: fffa80011f855000
R13: ffffea00047e1500 R14: 1ffffffff1b7ac8d R15: 0000000000000000
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_bulk_noprof+0x560/0x710
 copy_splice_read+0x173/0xa50
 splice_direct_to_actor+0x4d0/0xcc0
 do_splice_direct+0x181/0x270
 do_sendfile+0x4da/0x7e0
 __se_sys_sendfile64+0x13e/0x190
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff1bd18ebe9
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:00007ff1be030038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007ff1bd3b5fa0 RCX: 00007ff1bd18ebe9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000007
RBP: 00007ff1bd211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000010000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff1bd3b6038 R14: 00007ff1bd3b5fa0 R15: 00007ffe2bdd3c78
 </TASK>

Allocated by task 14894:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x27a/0x4f0
 copy_splice_read+0x143/0xa50
 splice_direct_to_actor+0x4d0/0xcc0
 do_splice_direct+0x181/0x270
 do_sendfile+0x4da/0x7e0
 __se_sys_sendfile64+0x13e/0x190
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 14894:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kfree+0x18e/0x440
 copy_splice_read+0x903/0xa50
 splice_direct_to_actor+0x4d0/0xcc0
 do_splice_direct+0x181/0x270
 do_sendfile+0x4da/0x7e0
 __se_sys_sendfile64+0x13e/0x190
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88801f7f1400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff88801f7f1400, ffff88801f7f1600)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88801f7f0000 pfn:0x1f7f0
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 ffffea0000bf9d10 ffffea0000c31610
raw: ffff88801f7f0000 000000000010000b 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801a441c80 ffffea0000bf9d10 ffffea0000c31610
head: ffff88801f7f0000 000000000010000b 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea00007dfc01 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 5838, tgid 5838 (syz-executor), ts 57492964994, free_ts 57465639950
 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
 device_add+0xbe/0xb50
 wiphy_register+0x1ba6/0x28d0
 ieee80211_register_hw+0x3425/0x4080
 mac80211_hwsim_new_radio+0x2f0e/0x5340
 hwsim_new_radio_nl+0xea4/0x1b10
 genl_family_rcv_msg_doit+0x215/0x300
 genl_rcv_msg+0x60e/0x790
 netlink_rcv_skb+0x208/0x470
 genl_rcv+0x28/0x40
page last free pid 5841 tgid 5841 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 stack_depot_save_flags+0x436/0x860
 kasan_save_track+0x4f/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 mas_alloc_nodes+0x2e9/0x8e0
 mas_erase+0x4c2/0x890
 mtree_erase+0xf0/0x150
 simple_offset_remove+0x58/0x90
 shmem_unlink+0x177/0x2d0
 vfs_unlink+0x394/0x650
 do_unlinkat+0x345/0x560
 __x64_sys_unlink+0x47/0x50
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88801f7f1300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801f7f1380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801f7f1400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88801f7f1480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801f7f1500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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