linux-kernel - [syzbot] [net?] KMSAN: uninit-value in xfrm_state

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Message-ID: <00000000000082378906092f51aa@google.com>
Date:   Thu, 02 Nov 2023 11:11:35 -0700
From:   syzbot <syzbot+23bbb17a7878e2b3d1d4@...kaller.appspotmail.com>
To:     davem@...emloft.net, edumazet@...gle.com,
        herbert@...dor.apana.org.au, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com, steffen.klassert@...unet.com,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] KMSAN: uninit-value in xfrm_state_find (2)

Hello,

syzbot found the following issue on:

HEAD commit:    3669558bdf35 Merge tag 'for-6.6-rc1-tag' of git://git.kern..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16656930680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=754d6383bae8bc99
dashboard link: https://syzkaller.appspot.com/bug?extid=23bbb17a7878e2b3d1d4
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f2e55d5455c8/disk-3669558b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5a0b7323ae76/vmlinux-3669558b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3430d935a839/bzImage-3669558b.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+23bbb17a7878e2b3d1d4@...kaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in xfrm_state_find+0x17bc/0x8ce0 net/xfrm/xfrm_state.c:1160
 xfrm_state_find+0x17bc/0x8ce0 net/xfrm/xfrm_state.c:1160
 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2469 [inline]
 xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:2514 [inline]
 xfrm_resolve_and_create_bundle+0x80c/0x4e30 net/xfrm/xfrm_policy.c:2807
 xfrm_lookup_with_ifid+0x3f7/0x3590 net/xfrm/xfrm_policy.c:3141
 xfrm_lookup net/xfrm/xfrm_policy.c:3270 [inline]
 xfrm_lookup_route+0x63/0x2b0 net/xfrm/xfrm_policy.c:3281
 ip6_dst_lookup_flow net/ipv6/ip6_output.c:1246 [inline]
 ip6_sk_dst_lookup_flow+0x1044/0x1260 net/ipv6/ip6_output.c:1278
 udpv6_sendmsg+0x3448/0x4000 net/ipv6/udp.c:1552
 inet6_sendmsg+0x105/0x190 net/ipv6/af_inet6.c:655
 sock_sendmsg_nosec net/socket.c:730 [inline]
 sock_sendmsg net/socket.c:753 [inline]
 ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2541
 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2595
 __sys_sendmmsg+0x3c4/0x950 net/socket.c:2681
 __do_sys_sendmmsg net/socket.c:2710 [inline]
 __se_sys_sendmmsg net/socket.c:2707 [inline]
 __x64_sys_sendmmsg+0xbc/0x120 net/socket.c:2707
 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

Local variable tmp.i.i created at:
 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2447 [inline]
 xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:2514 [inline]
 xfrm_resolve_and_create_bundle+0x370/0x4e30 net/xfrm/xfrm_policy.c:2807
 xfrm_lookup_with_ifid+0x3f7/0x3590 net/xfrm/xfrm_policy.c:3141

CPU: 0 PID: 26289 Comm: syz-executor.3 Not tainted 6.6.0-rc1-syzkaller-00033-g3669558bdf35 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
=====================================================


---
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