Message-ID: <00000000000067270b05ef119467@google.com>
Date:   Mon, 05 Dec 2022 01:47:46 -0800
From:   syzbot <syzbot+8d39c1e195e443de0dfe@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, fmdefrancesco@...il.com,
        ira.weiny@...el.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, slava@...eyko.com,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] KASAN: use-after-free Read in hfsplus_btree_open

Hello,

syzbot found the following issue on:

HEAD commit:    a4412fdd49dc error-injection: Add prompt for function erro..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=119c684d880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2325e409a9a893e1
dashboard link: https://syzkaller.appspot.com/bug?extid=8d39c1e195e443de0dfe
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3bbe66b25958/disk-a4412fdd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6851483ca667/vmlinux-a4412fdd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2d5b23cb4616/bzImage-a4412fdd.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8d39c1e195e443de0dfe@...kaller.appspotmail.com

loop1: detected capacity change from 0 to 1024
==================================================================
BUG: KASAN: use-after-free in hfsplus_btree_open+0x918/0xd00 fs/hfsplus/btree.c:155
Read of size 4 at addr ffff88804402bc74 by task syz-executor.1/6533

CPU: 1 PID: 6533 Comm: syz-executor.1 Not tainted 6.1.0-rc7-syzkaller-00123-ga4412fdd49dc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
 print_address_description+0x74/0x340 mm/kasan/report.c:284
 print_report+0x107/0x1f0 mm/kasan/report.c:395
 kasan_report+0xcd/0x100 mm/kasan/report.c:495
 hfsplus_btree_open+0x918/0xd00 fs/hfsplus/btree.c:155
 hfsplus_fill_super+0xa7b/0x1b50 fs/hfsplus/super.c:473
 mount_bdev+0x26c/0x3a0 fs/super.c:1401
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1531
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f974568d60a
Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f974632af88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000000005e7 RCX: 00007f974568d60a
RDX: 0000000020000600 RSI: 0000000020000640 RDI: 00007f974632afe0
RBP: 00007f974632b020 R08: 00007f974632b020 R09: 0000000000a00010
R10: 0000000000a00010 R11: 0000000000000202 R12: 0000000020000600
R13: 0000000020000640 R14: 00007f974632afe0 R15: 0000000020000140
 </TASK>

Allocated by task 4560:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x3d/0x60 mm/kasan/common.c:52
 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:325
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slab.h:737 [inline]
 slab_alloc_node mm/slub.c:3398 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc_lru+0x180/0x2e0 mm/slub.c:3429
 alloc_inode_sb include/linux/fs.h:3125 [inline]
 f2fs_alloc_inode+0x14d/0x520 fs/f2fs/super.c:1366
 alloc_inode fs/inode.c:259 [inline]
 iget_locked+0x191/0x830 fs/inode.c:1286
 f2fs_iget+0x51/0x4bb0 fs/f2fs/inode.c:505
 f2fs_fill_super+0x52c4/0x6c40 fs/f2fs/super.c:4333
 mount_bdev+0x26c/0x3a0 fs/super.c:1401
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1531
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Last potentially related work creation:
 kasan_save_stack+0x2b/0x50 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:481
 call_rcu+0x163/0x9c0 kernel/rcu/tree.c:2798
 f2fs_fill_super+0x5669/0x6c40 fs/f2fs/super.c:4516
 mount_bdev+0x26c/0x3a0 fs/super.c:1401
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1531
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff88804402b540
 which belongs to the cache f2fs_inode_cache of size 2144
The buggy address is located 1844 bytes inside of
 2144-byte region [ffff88804402b540, ffff88804402bda0)

The buggy address belongs to the physical page:
page:ffffea0001100a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88804402f360 pfn:0x44028
head:ffffea0001100a00 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88801df0f201
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff88801ccc23c0
raw: ffff88804402f360 00000000800e0001 00000001ffffffff ffff88801df0f201
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 4517, tgid 4516 (syz-executor.1), ts 148789358194, free_ts 135585079530
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4291
 __alloc_pages+0x259/0x560 mm/page_alloc.c:5558
 alloc_slab_page+0x70/0xf0 mm/slub.c:1794
 allocate_slab+0x5e/0x4b0 mm/slub.c:1939
 new_slab mm/slub.c:1992 [inline]
 ___slab_alloc+0x782/0xe20 mm/slub.c:3180
 __slab_alloc mm/slub.c:3279 [inline]
 slab_alloc_node mm/slub.c:3364 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc_lru+0x233/0x2e0 mm/slub.c:3429
 alloc_inode_sb include/linux/fs.h:3125 [inline]
 f2fs_alloc_inode+0x14d/0x520 fs/f2fs/super.c:1366
 alloc_inode fs/inode.c:259 [inline]
 iget_locked+0x191/0x830 fs/inode.c:1286
 f2fs_iget+0x51/0x4bb0 fs/f2fs/inode.c:505
 f2fs_fill_super+0x38b1/0x6c40 fs/f2fs/super.c:4222
 mount_bdev+0x26c/0x3a0 fs/super.c:1401
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1531
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1459 [inline]
 free_pcp_prepare+0x80c/0x8f0 mm/page_alloc.c:1509
 free_unref_page_prepare mm/page_alloc.c:3387 [inline]
 free_unref_page+0x7d/0x5f0 mm/page_alloc.c:3483
 free_slab mm/slub.c:2031 [inline]
 discard_slab mm/slub.c:2037 [inline]
 __unfreeze_partials+0x1ab/0x200 mm/slub.c:2586
 put_cpu_partial+0x106/0x170 mm/slub.c:2662
 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:302
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slab.h:737 [inline]
 slab_alloc_node mm/slub.c:3398 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc_lru+0x180/0x2e0 mm/slub.c:3429
 alloc_inode_sb include/linux/fs.h:3125 [inline]
 sock_alloc_inode+0x21/0xc0 net/socket.c:304
 alloc_inode fs/inode.c:259 [inline]
 new_inode_pseudo+0x61/0x1d0 fs/inode.c:1018
 sock_alloc net/socket.c:627 [inline]
 __sock_create+0x12b/0x850 net/socket.c:1479
 sock_create net/socket.c:1566 [inline]
 __sys_socket_create net/socket.c:1603 [inline]
 __sys_socket+0x119/0x360 net/socket.c:1636
 __do_sys_socket net/socket.c:1649 [inline]
 __se_sys_socket net/socket.c:1647 [inline]
 __x64_sys_socket+0x76/0x80 net/socket.c:1647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88804402bb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88804402bb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88804402bc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff88804402bc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88804402bd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
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