linux-kernel - KMSAN: uninit-value in tipc_nl_compat_link_reset

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Message-ID: <000000000000cb7033057ede764e@google.com>
Date:   Mon, 07 Jan 2019 05:47:03 -0800
From:   syzbot <syzbot+e01d94b5a4c266be6e4c@...kaller.appspotmail.com>
To:     davem@...emloft.net, glider@...gle.com, 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: KMSAN: uninit-value in tipc_nl_compat_link_reset_stats

Hello,

syzbot found the following crash on:

HEAD commit:    8ba10281f9e5 Fix comment style, NFC
git tree:       kmsan
console output: https://syzkaller.appspot.com/x/log.txt?x=10b4c3bf400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c8a62a4eb8ea3e9f
dashboard link: https://syzkaller.appspot.com/bug?extid=e01d94b5a4c266be6e4c
compiler:       clang version 8.0.0 (trunk 350161)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13527dbf400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+e01d94b5a4c266be6e4c@...kaller.appspotmail.com

IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
==================================================================
BUG: KMSAN: uninit-value in strlen+0x3b/0xa0 lib/string.c:486
CPU: 1 PID: 11057 Comm: syz-executor0 Not tainted 4.20.0-rc7+ #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x173/0x1d0 lib/dump_stack.c:113
  kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:613
  __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:295
  strlen+0x3b/0xa0 lib/string.c:486
  nla_put_string include/net/netlink.h:1154 [inline]
  tipc_nl_compat_link_reset_stats+0x1f0/0x360 net/tipc/netlink_compat.c:760
  __tipc_nl_compat_doit net/tipc/netlink_compat.c:311 [inline]
  tipc_nl_compat_doit+0x3aa/0xaf0 net/tipc/netlink_compat.c:344
  tipc_nl_compat_handle net/tipc/netlink_compat.c:1107 [inline]
  tipc_nl_compat_recv+0x14d7/0x2760 net/tipc/netlink_compat.c:1210
  genl_family_rcv_msg net/netlink/genetlink.c:601 [inline]
  genl_rcv_msg+0x185f/0x1a60 net/netlink/genetlink.c:626
  netlink_rcv_skb+0x444/0x640 net/netlink/af_netlink.c:2477
  genl_rcv+0x63/0x80 net/netlink/genetlink.c:637
  netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
  netlink_unicast+0xf40/0x1020 net/netlink/af_netlink.c:1336
  netlink_sendmsg+0x127f/0x1300 net/netlink/af_netlink.c:1917
  sock_sendmsg_nosec net/socket.c:621 [inline]
  sock_sendmsg net/socket.c:631 [inline]
  ___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2116
  __sys_sendmsg net/socket.c:2154 [inline]
  __do_sys_sendmsg net/socket.c:2163 [inline]
  __se_sys_sendmsg+0x305/0x460 net/socket.c:2161
  __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161
  do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
  entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457ec9
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7  
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff  
ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f2557338c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f25573396d4
R13: 00000000004cb478 R14: 00000000004d86c8 R15: 00000000ffffffff

Uninit was created at:
  kmsan_save_stack_with_flags mm/kmsan/kmsan.c:204 [inline]
  kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:158
  kmsan_kmalloc+0xa6/0x130 mm/kmsan/kmsan_hooks.c:176
  kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:185
  slab_post_alloc_hook mm/slab.h:446 [inline]
  slab_alloc_node mm/slub.c:2759 [inline]
  __kmalloc_node_track_caller+0xe18/0x1030 mm/slub.c:4383
  __kmalloc_reserve net/core/skbuff.c:137 [inline]
  __alloc_skb+0x309/0xa20 net/core/skbuff.c:205
  alloc_skb include/linux/skbuff.h:998 [inline]
  netlink_alloc_large_skb net/netlink/af_netlink.c:1182 [inline]
  netlink_sendmsg+0xb82/0x1300 net/netlink/af_netlink.c:1892
  sock_sendmsg_nosec net/socket.c:621 [inline]
  sock_sendmsg net/socket.c:631 [inline]
  ___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2116
  __sys_sendmsg net/socket.c:2154 [inline]
  __do_sys_sendmsg net/socket.c:2163 [inline]
  __se_sys_sendmsg+0x305/0x460 net/socket.c:2161
  __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161
  do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
  entry_SYSCALL_64_after_hwframe+0x63/0xe7
==================================================================


---
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