syzbot

IPVS: ftp: loaded support on port[0] = 21
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BUG: KASAN: use-after-free in hfsplus_releasepage+0x4bc/0x540 fs/hfsplus/inode.c:91
Read of size 4 at addr ffff8880b2e70e78 by task syz-executor380/8083

CPU: 0 PID: 8083 Comm: syz-executor380 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load4_noabort+0x88/0x90 mm/kasan/report.c:432
 hfsplus_releasepage+0x4bc/0x540 fs/hfsplus/inode.c:91
 try_to_release_page+0x242/0x390 mm/filemap.c:3358
 block_invalidatepage+0x45b/0x4f0 fs/buffer.c:1511
 do_invalidatepage mm/truncate.c:165 [inline]
 truncate_cleanup_page+0x2b7/0x430 mm/truncate.c:184
 truncate_inode_pages_range+0x528/0x1b00 mm/truncate.c:364
 hfsplus_evict_inode+0x16/0xd0 fs/hfsplus/super.c:167
 evict+0x2ed/0x760 fs/inode.c:559
 iput_final fs/inode.c:1555 [inline]
 iput+0x4f1/0x860 fs/inode.c:1581
 hfsplus_put_super+0x270/0x3f0 fs/hfsplus/super.c:301
 generic_shutdown_super+0x144/0x370 fs/super.c:456
 kill_block_super+0x97/0xf0 fs/super.c:1185
 deactivate_locked_super+0x94/0x160 fs/super.c:329
 deactivate_super+0x174/0x1a0 fs/super.c:360
 cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xbf3/0x2be0 kernel/exit.c:870
 do_group_exit+0x125/0x310 kernel/exit.c:967
 __do_sys_exit_group kernel/exit.c:978 [inline]
 __se_sys_exit_group kernel/exit.c:976 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:976
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f1ee0e08cc9
Code: Bad RIP value.
RSP: 002b:00007ffdeaa88db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f1ee0e7e3f0 RCX: 00007f1ee0e08cc9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00000000000005f6
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1ee0e7e3f0
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001

Allocated by task 8083:
 kmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625
 kmalloc include/linux/slab.h:515 [inline]
 kzalloc include/linux/slab.h:709 [inline]
 hfsplus_btree_open+0x4d/0x10a0 fs/hfsplus/btree.c:142
 hfsplus_fill_super+0xa2d/0x19e0 fs/hfsplus/super.c:473
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x310 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2492 [inline]
 do_mount+0x115c/0x2f50 fs/namespace.c:2822
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8083:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 hfsplus_btree_close+0x1a6/0x300 fs/hfsplus/btree.c:279
 hfsplus_put_super+0x220/0x3f0 fs/hfsplus/super.c:299
 generic_shutdown_super+0x144/0x370 fs/super.c:456
 kill_block_super+0x97/0xf0 fs/super.c:1185
 deactivate_locked_super+0x94/0x160 fs/super.c:329
 deactivate_super+0x174/0x1a0 fs/super.c:360
 cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098
 task_work_run+0x148/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xbf3/0x2be0 kernel/exit.c:870
 do_group_exit+0x125/0x310 kernel/exit.c:967
 __do_sys_exit_group kernel/exit.c:978 [inline]
 __se_sys_exit_group kernel/exit.c:976 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:976
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880b2e70e40
 which belongs to the cache kmalloc-4096 of size 4096
The buggy address is located 56 bytes inside of
 4096-byte region [ffff8880b2e70e40, ffff8880b2e71e40)
The buggy address belongs to the page:
page:ffffea0002cb9c00 count:1 mapcount:0 mapping:ffff88813bff0dc0 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffffea0002cbaf08 ffffea000256ff88 ffff88813bff0dc0
raw: 0000000000000000 ffff8880b2e70e40 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880b2e70d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880b2e70d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880b2e70e00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                                                ^
 ffff8880b2e70e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880b2e70f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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