netdev - [syzbot] [tipc?] KMSAN: uninit-value in __tipc_nl_bearer

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Message-ID: <0000000000006d24f50605db3b41@google.com>
Date: Thu, 21 Sep 2023 02:36:53 -0700
From: syzbot <syzbot+9425c47dccbcb4c17d51@...kaller.appspotmail.com>
To: davem@...emloft.net, edumazet@...gle.com, jmaloy@...hat.com, 
	kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
	pabeni@...hat.com, syzkaller-bugs@...glegroups.com, 
	tipc-discussion@...ts.sourceforge.net, ying.xue@...driver.com
Subject: [syzbot] [tipc?] KMSAN: uninit-value in __tipc_nl_bearer_enable (2)

Hello,

syzbot found the following issue on:

HEAD commit:    4a0fc73da97e Merge tag 's390-6.6-2' of git://git.kernel.or..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=15cc921c680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a2fd75f3f45dd99
dashboard link: https://syzkaller.appspot.com/bug?extid=9425c47dccbcb4c17d51
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1737422c680000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13c74c94680000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/28d14dd1284c/disk-4a0fc73d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a5ca8dd87357/vmlinux-4a0fc73d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c7dda831a503/bzImage-4a0fc73d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9425c47dccbcb4c17d51@...kaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in strscpy+0xc4/0x160
 strscpy+0xc4/0x160
 bearer_name_validate net/tipc/bearer.c:147 [inline]
 tipc_enable_bearer net/tipc/bearer.c:259 [inline]
 __tipc_nl_bearer_enable+0x634/0x2220 net/tipc/bearer.c:1043
 tipc_nl_bearer_enable+0x3c/0x70 net/tipc/bearer.c:1052
 genl_family_rcv_msg_doit net/netlink/genetlink.c:971 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1051 [inline]
 genl_rcv_msg+0x11ec/0x1290 net/netlink/genetlink.c:1066
 netlink_rcv_skb+0x371/0x650 net/netlink/af_netlink.c:2545
 genl_rcv+0x40/0x60 net/netlink/genetlink.c:1075
 netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]
 netlink_unicast+0xf47/0x1250 net/netlink/af_netlink.c:1368
 netlink_sendmsg+0x1238/0x13d0 net/netlink/af_netlink.c:1910
 sock_sendmsg_nosec net/socket.c:730 [inline]
 sock_sendmsg net/socket.c:753 [inline]
 ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2540
 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2594
 __sys_sendmsg net/socket.c:2623 [inline]
 __do_sys_sendmsg net/socket.c:2632 [inline]
 __se_sys_sendmsg net/socket.c:2630 [inline]
 __x64_sys_sendmsg+0x307/0x490 net/socket.c:2630
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Uninit was created at:
 slab_post_alloc_hook+0x12f/0xb70 mm/slab.h:767
 slab_alloc_node mm/slub.c:3478 [inline]
 kmem_cache_alloc_node+0x577/0xa80 mm/slub.c:3523
 kmalloc_reserve+0x148/0x470 net/core/skbuff.c:559
 __alloc_skb+0x318/0x740 net/core/skbuff.c:644
 alloc_skb include/linux/skbuff.h:1286 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1214 [inline]
 netlink_sendmsg+0xb34/0x13d0 net/netlink/af_netlink.c:1885
 sock_sendmsg_nosec net/socket.c:730 [inline]
 sock_sendmsg net/socket.c:753 [inline]
 ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2540
 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2594
 __sys_sendmsg net/socket.c:2623 [inline]
 __do_sys_sendmsg net/socket.c:2632 [inline]
 __se_sys_sendmsg net/socket.c:2630 [inline]
 __x64_sys_sendmsg+0x307/0x490 net/socket.c:2630
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

CPU: 1 PID: 4993 Comm: syz-executor386 Not tainted 6.5.0-syzkaller-12145-g4a0fc73da97e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
=====================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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