use after free in sysfs_find_dirent

[Dave Jones]

general protection fault: 0000 [#1] PREEMPT SMP 
Modules linked in: vmw_vsock_vmci_transport vmw_vmci vsock bnep fuse rfcomm hidp l2tp_ppp l2tp_core 8021q garp mrp dlci pppoe pppox ppp_generic slhc scsi_transport_iscsi rose caif_socket caif can_raw bridge af_key can_bcm llc2 stp can netrom phonet af_rxrpc nfnetlink ipt_ULOG x25 rds irda crc_ccitt ax25 ipx p8023 p8022 decnet atm appletalk psnap llc nfc lockd sunrpc ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_conntrack nf_conntrack ip6table_filter ip6_tables snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_pcm btusb snd_page_alloc bluetooth snd_timer snd microcode rfkill usb_debug serio_raw pcspkr edac_core soundcore vhost_net tun r8169 macvtap macvlan mii kvm_amd kvm
CPU 0 
Pid: 23476, comm: trinity-child1 Not tainted 3.9.0-rc1+ #69 Gigabyte Technology Co., Ltd. GA-MA78GM-S2H/GA-MA78GM-S2H
RIP: 0010:[<ffffffff812356b7>]  [<ffffffff812356b7>] sysfs_find_dirent+0x47/0xf0
RSP: 0018:ffff88000585bd68  EFLAGS: 00010202
RAX: 0000000094be55f6 RBX: 6b6b6b6b6b6b6b6b RCX: 000000006b6b6b6b
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88000585bd88 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000029c161
R13: ffff8800a8918288 R14: 0000000000000000 R15: 0000000000000009
FS:  00007fa12651e740(0000) GS:ffff88012ae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000010 CR3: 000000001a128000 CR4: 00000000000007f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process trinity-child1 (pid: 23476, threadinfo ffff88000585a000, task ffff8800cd454920)
Stack:
 ffff880128edc1e8 ffff8800a8918250 fffffffffffffffe ffff88012265f430
 ffff88000585bdb8 ffffffff812357cd ffff8800a8918250 ffff8801226514d0
 ffff88000585bf38 0000000000000000 ffff88000585bde8 ffffffff811bb30d
Call Trace:
 [<ffffffff812357cd>] sysfs_lookup+0x6d/0xe0
 [<ffffffff811bb30d>] lookup_real+0x1d/0x60
 [<ffffffff811bb528>] __lookup_hash+0x38/0x50
 [<ffffffff811bb559>] lookup_hash+0x19/0x20
 [<ffffffff811be993>] kern_path_create+0x93/0x170
 [<ffffffff811bce46>] ? getname_flags.part.32+0x86/0x150
 [<ffffffff811beaba>] user_path_create+0x4a/0x70
 [<ffffffff811c1a09>] sys_mkdirat+0x39/0xe0
 [<ffffffff816cd942>] system_call_fastpath+0x16/0x1b
Code: 00 48 8b 9f 88 00 00 00 f6 c4 0f 0f 95 c0 48 85 f6 0f 95 c2 38 d0 75 79 4c 89 ee 4c 89 f7 e8 91 ef ff ff 41 89 c4 48 85 db 74 1d <8b> 4b 28 41 39 cc 74 21 44 89 e0 29 c8 83 f8 00 7c 2c 74 45 48 
RIP  [<ffffffff812356b7>] sysfs_find_dirent+0x47/0xf0
 RSP <ffff88000585bd68>
---[ end trace 4ba97703eaafbb8b ]---


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