Date:   Tue, 24 Oct 2017 08:20:54 -0700
From:   syzbot 
        <bot+a9d6dccad76c3e1f6cad1031d8f2292c4f4f0e1a@...kaller.appspotmail.com>
To:     davem@...emloft.net, jon.maloy@...csson.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com,
        tipc-discussion@...ts.sourceforge.net, ying.xue@...driver.com
Subject: KASAN: slab-out-of-bounds Read in tipc_nametbl_lookup_dst_nodes

Hello,

syzkaller hit the following crash on  
80cee03bf1d626db0278271b505d7f5febb37bba
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers


BUG: KASAN: slab-out-of-bounds in tipc_nametbl_lookup_dst_nodes+0x4a3/0x4b0  
net/tipc/name_table.c:670
Read of size 4 at addr ffff8801d3275f10 by task syzkaller601354/2981

CPU: 1 PID: 2981 Comm: syzkaller601354 Not tainted 4.13.0+ #42
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:16 [inline]
  dump_stack+0x194/0x257 lib/dump_stack.c:52
  print_address_description+0x73/0x250 mm/kasan/report.c:252
  kasan_report_error mm/kasan/report.c:351 [inline]
  kasan_report+0x24e/0x340 mm/kasan/report.c:409
  __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429
  tipc_nametbl_lookup_dst_nodes+0x4a3/0x4b0 net/tipc/name_table.c:670
  tipc_sendmcast+0x704/0xe30 net/tipc/socket.c:767
  __tipc_sendmsg+0xf49/0x1590 net/tipc/socket.c:971
  __tipc_sendstream+0x8eb/0xc00 net/tipc/socket.c:1065
  tipc_sendstream+0x50/0x70 net/tipc/socket.c:1039
  tipc_send_packet+0x33/0x50 net/tipc/socket.c:1113
  sock_sendmsg_nosec net/socket.c:633 [inline]
  sock_sendmsg+0xca/0x110 net/socket.c:643
  ___sys_sendmsg+0x75b/0x8a0 net/socket.c:2049
  __sys_sendmsg+0xe5/0x210 net/socket.c:2083
  SYSC_sendmsg net/socket.c:2094 [inline]
  SyS_sendmsg+0x2d/0x50 net/socket.c:2090
  entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x43fd79
RSP: 002b:00007ffcb61e8988 EFLAGS: 00000203 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd79
RDX: 0000000000000004 RSI: 00000000207ca000 RDI: 0000000000000003
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000203 R12: 00000000004016e0
R13: 0000000000401770 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 1:
  save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
  save_stack+0x43/0xd0 mm/kasan/kasan.c:447
  set_track mm/kasan/kasan.c:459 [inline]
  kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
  kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3627
  kmalloc include/linux/slab.h:493 [inline]
  kmalloc_array include/linux/slab.h:611 [inline]
  kcalloc include/linux/slab.h:623 [inline]
  tipc_subseq_alloc net/tipc/name_table.c:141 [inline]
  tipc_nameseq_create+0xe8/0x540 net/tipc/name_table.c:152
  tipc_nametbl_insert_publ+0xf77/0x17c0 net/tipc/name_table.c:476
  tipc_nametbl_publish+0x2aa/0x4f0 net/tipc/name_table.c:701
  tipc_sk_publish net/tipc/socket.c:2201 [inline]
  tipc_bind+0x33a/0x700 net/tipc/socket.c:629
  kernel_bind+0x62/0x80 net/socket.c:3285
  tipc_create_listen_sock net/tipc/server.c:337 [inline]
  tipc_open_listening_sock net/tipc/server.c:395 [inline]
  tipc_server_start+0x3a1/0xb60 net/tipc/server.c:610
  tipc_topsrv_start+0x64f/0x890 net/tipc/subscr.c:382
  tipc_init_net+0x3cc/0x570 net/tipc/core.c:74
  ops_init+0x10a/0x570 net/core/net_namespace.c:118
  __register_pernet_operations net/core/net_namespace.c:879 [inline]
  register_pernet_operations+0x45e/0x980 net/core/net_namespace.c:953
  register_pernet_subsys+0x2a/0x40 net/core/net_namespace.c:995
  tipc_init+0x83/0x104 net/tipc/core.c:136
  do_one_initcall+0x9e/0x330 init/main.c:826
  do_initcall_level init/main.c:892 [inline]
  do_initcalls init/main.c:900 [inline]
  do_basic_setup init/main.c:918 [inline]
  kernel_init_freeable+0x469/0x521 init/main.c:1066
  kernel_init+0x13/0x172 init/main.c:993
  ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801d3275f00
  which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
  32-byte region [ffff8801d3275f00, ffff8801d3275f20)
The buggy address belongs to the page:
page:ffffea00074c9d40 count:1 mapcount:0 mapping:ffff8801d3275000  
index:0xffff8801d3275fc1
flags: 0x200000000000100(slab)
raw: 0200000000000100 ffff8801d3275000 ffff8801d3275fc1 000000010000003f
raw: ffffea00074c8920 ffffea00074cea20 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8801d3275e00: fb fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
  ffff8801d3275e80: 04 fc fc fc fc fc fc fc 00 00 00 fc fc fc fc fc
> ffff8801d3275f00: 00 00 fc fc fc fc fc fc 00 00 00 00 fc fc fc fc
                          ^
  ffff8801d3275f80: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
  ffff8801d3276000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


---
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