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BUG: KASAN: slab-out-of-bounds in dtSplitPage+0x1248/0x37c0
Read of size 1 at addr ffff8881b950bfa5 by task syz.1.471/9101

CPU: 1 UID: 0 PID: 9101 Comm: syz.1.471 Not tainted syzkaller #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:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_report+0xba/0x230
 kasan_report+0x117/0x150
 dtSplitPage+0x1248/0x37c0
 dtInsert+0x10a4/0x5f10
 jfs_create+0x75b/0xb10
 path_openat+0x1395/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f889ad9c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f889bcb9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f889b015fa0 RCX: 00007f889ad9c799
RDX: 000000000000275a RSI: 0000200000000000 RDI: ffffffffffffff9c
RBP: 00007f889ae32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f889b016038 R14: 00007f889b015fa0 R15: 00007ffcc36bdb98
 </TASK>

Allocated by task 9101:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_lru_noprof+0x2b8/0x640
 jfs_alloc_inode+0x28/0x70
 alloc_inode+0x6a/0x1b0
 iget_locked+0x131/0x6a0
 jfs_iget+0x24/0x470
 jfs_lookup+0x220/0x420
 __lookup_slow+0x2b7/0x410
 lookup_slow+0x53/0x70
 path_lookupat+0x3f5/0x8c0
 filename_lookup+0x256/0x5d0
 __se_sys_chdir+0xa8/0x2a0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8881b950b6f0
 which belongs to the cache jfs_ip of size 2216
The buggy address is located 13 bytes to the right of
 allocated 2216-byte region [ffff8881b950b6f0, ffff8881b950bf98)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8881b950ede0 pfn:0x1b9508
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff8881b950f709
flags: 0x57ff00000000240(workingset|head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000240 ffff88816907f140 ffff88816907cb88 ffffea0006e56e10
raw: ffff8881b950ede0 00000008000d000c 00000000f5000000 ffff8881b950f709
head: 057ff00000000240 ffff88816907f140 ffff88816907cb88 ffffea0006e56e10
head: ffff8881b950ede0 00000008000d000c 00000000f5000000 ffff8881b950f709
head: 057ff00000000003 ffffea0006e54201 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd2050(__GFP_RECLAIMABLE|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 7233, tgid 7232 (syz.4.234), ts 108621624979, free_ts 93293185300
 post_alloc_hook+0x231/0x280
 get_page_from_freelist+0x24dc/0x2580
 __alloc_frozen_pages_noprof+0x18d/0x380
 allocate_slab+0x77/0x660
 refill_objects+0x331/0x3c0
 __pcs_replace_empty_main+0x2e6/0x730
 kmem_cache_alloc_lru_noprof+0x37c/0x640
 jfs_alloc_inode+0x28/0x70
 alloc_inode+0x6a/0x1b0
 new_inode+0x22/0x170
 diReadSpecial+0x52/0x710
 jfs_mount+0x2a2/0x870
 jfs_fill_super+0x6bc/0xd80
 get_tree_bdev_flags+0x431/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x341/0xd30
page last free pid 5788 tgid 5788 stack trace:
 __free_frozen_pages+0xc2b/0xdb0
 __slab_free+0x263/0x2b0
 qlist_free_all+0x97/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_node_noprof+0x384/0x690
 __alloc_skb+0x1d0/0x7d0
 tcp_stream_alloc_skb+0x3f/0x580
 tcp_sendmsg_locked+0x1375/0x5490
 tcp_sendmsg+0x2f/0x50
 sock_write_iter+0x406/0x4f0
 vfs_write+0x61d/0xb90
 ksys_write+0x150/0x270
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff8881b950be80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881b950bf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881b950bf80: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
                               ^
 ffff8881b950c000: fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881b950c080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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