linux-kernel - net/sctp: null-ptr-deref in sctp_put_port/sctp_endpoint

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Date:   Wed, 8 Feb 2017 20:00:51 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Vlad Yasevich <vyasevich@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-sctp@...r.kernel.org, netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: net/sctp: null-ptr-deref in sctp_put_port/sctp_endpoint_destroy

Hi,

I've got the following error report while fuzzing the kernel with syzkaller.

On commit 926af6273fc683cd98cd0ce7bf0d04a02eed6742.

A reproducer and .config are attached.

general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 3 PID: 19506 Comm: syz-executor0 Not tainted 4.10.0-rc7+ #126
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff88003d7c1700 task.stack: ffff880037990000
RIP: 0010:__write_once_size include/linux/compiler.h:272 [inline]
RIP: 0010:__hlist_del include/linux/list.h:635 [inline]
RIP: 0010:__sk_del_bind_node include/net/sock.h:685 [inline]
RIP: 0010:__sctp_put_port net/sctp/socket.c:6994 [inline]
RIP: 0010:sctp_put_port+0x210/0x620 net/sctp/socket.c:7004
RSP: 0018:ffff8800379969e0 EFLAGS: 00010246
RAX: dffffc0000000010 RBX: 1ffff10006f32d41 RCX: ffff880037996a28
RDX: 0000000000000000 RSI: 0000000000000000 RDI: dffffc0000000000
RBP: ffff880037996b10 R08: 0000000000000000 R09: 0000000000000000
R10: 1c8b9dfca637effe R11: dffffc0000000000 R12: 0000000000000005
R13: ffff880037996ae8 R14: ffff88003a066c40 R15: ffff88003a067178
FS:  00007fd314dba700(0000) GS:ffff88006df00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020002ffc CR3: 000000003b10e000 CR4: 00000000000006e0
Call Trace:
 sctp_endpoint_destroy net/sctp/endpointola.c:275 [inline]
 sctp_endpoint_put+0x1b2/0x260 net/sctp/endpointola.c:296
 sctp_endpoint_free+0x97/0xc0 net/sctp/endpointola.c:238
 sctp_destroy_sock+0xd6/0x470 net/sctp/socket.c:4254
 sctp_v6_destroy_sock+0x15/0x20 net/sctp/socket.c:7871
 sk_common_release+0xbf/0x4e0 net/core/sock.c:2747
 sctp_close+0x764/0x9f0 net/sctp/socket.c:1550
 inet_release+0xed/0x1c0 net/ipv4/af_inet.c:425
 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:431
 sock_release+0x8d/0x1e0 net/socket.c:599
 sock_close+0x16/0x20 net/socket.c:1063
 __fput+0x332/0x7f0 fs/file_table.c:208
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x19b/0x270 kernel/task_work.c:116
 exit_task_work include/linux/task_work.h:21 [inline]
 do_exit+0x186b/0x2800 kernel/exit.c:839
 do_group_exit+0x149/0x420 kernel/exit.c:943
 get_signal+0x76d/0x17e0 kernel/signal.c:2313
 do_signal+0xd2/0x2190 arch/x86/kernel/signal.c:807
 exit_to_usermode_loop+0x170/0x200 arch/x86/entry/common.c:156
 prepare_exit_to_usermode arch/x86/entry/common.c:190 [inline]
 syscall_return_slowpath+0x3d3/0x420 arch/x86/entry/common.c:259
 entry_SYSCALL_64_fastpath+0xc0/0xc2
RIP: 0033:0x4458b9
RSP: 002b:00007fd314db9cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 0000000000708170 RCX: 00000000004458b9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000708170
RBP: 0000000000708150 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd314dba9c0 R15: 00007fd314dba700
Code: ff ff ff 49 8b 76 20 48 bf 00 00 00 00 00 fc ff df 49 89 c8 49
c1 e8 03 41 c6 04 38 00 49 89 f0 49 89 95 40 ff ff ff 49 c1 e8 03 <41>
80 3c 38 00 0f 85 f6 02 00 00 48 c1 e9 03 49 b8 00 00 00 00
RIP: __write_once_size include/linux/compiler.h:272 [inline] RSP:
ffff8800379969e0
RIP: __hlist_del include/linux/list.h:635 [inline] RSP: ffff8800379969e0
RIP: __sk_del_bind_node include/net/sock.h:685 [inline] RSP: ffff8800379969e0
RIP: __sctp_put_port net/sctp/socket.c:6994 [inline] RSP: ffff8800379969e0
RIP: sctp_put_port+0x210/0x620 net/sctp/socket.c:7004 RSP: ffff8800379969e0
---[ end trace 54c316f8731a5a88 ]---
Kernel panic - not syncing: Fatal exception in interrupt
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Download attachment ".config" of type "application/octet-stream" (124975 bytes)

View attachment "sctp-port-null-poc.c" of type "text/x-csrc" (6130 bytes)