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Date:   Sun, 25 Sep 2022 04:50:31 -0700
Message-ID: <000000000000a96c0b05e97f0444@google.com>
Subject: [syzbot] WARNING in u32_change
From:   syzbot <syzbot+a2c4601efc75848ba321@syzkaller.appspotmail.com>
To:     davem@davemloft.net, edumazet@google.com, jhs@mojatatu.com,
        jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org, pabeni@redhat.com,
        syzkaller-bugs@googlegroups.com, xiyou.wangcong@gmail.com
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Hello,

syzbot found the following issue on:

HEAD commit:    483fed3b5dc8 Add linux-next specific files for 20220921
git tree:       linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=16becbd5080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=849cb9f70f15b1ba
dashboard link: https://syzkaller.appspot.com/bug?extid=a2c4601efc75848ba321
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13bc196f080000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=152b15f8880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/1cb3f4618323/disk-483fed3b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cc02cb30b495/vmlinux-483fed3b.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a2c4601efc75848ba321@syzkaller.appspotmail.com

------------[ cut here ]------------
memcpy: detected field-spanning write (size 80) of single field "&n->sel" at net/sched/cls_u32.c:1043 (size 16)
WARNING: CPU: 0 PID: 3608 at net/sched/cls_u32.c:1043 u32_change+0x2962/0x3250 net/sched/cls_u32.c:1043
Modules linked in:
CPU: 0 PID: 3608 Comm: syz-executor971 Not tainted 6.0.0-rc6-next-20220921-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2022
RIP: 0010:u32_change+0x2962/0x3250 net/sched/cls_u32.c:1043
Code: f4 df 14 fa 48 8b b5 78 fe ff ff b9 10 00 00 00 48 c7 c2 20 f7 f5 8a 48 c7 c7 a0 f6 f5 8a c6 05 55 b3 63 06 01 e8 db d6 df 01 <0f> 0b e9 73 f3 ff ff e8 c2 df 14 fa 48 c7 c7 00 fc f5 8a e8 66 ed
RSP: 0018:ffffc90003d7f300 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffffc90003d7f618 RCX: 0000000000000000
RDX: ffff8880235f1d40 RSI: ffffffff81620348 RDI: fffff520007afe52
RBP: ffffc90003d7f4a0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 203a7970636d656d R12: ffff888021d420e0
R13: ffffc90003d7f5b8 R14: ffff888021d43c30 R15: ffff888021d42000
FS:  0000555555f71300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000064a110 CR3: 000000002824c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tc_new_tfilter+0x938/0x2190 net/sched/cls_api.c:2146
 rtnetlink_rcv_msg+0x955/0xca0 net/core/rtnetlink.c:6082
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2540
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x917/0xe10 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 ____sys_sendmsg+0x712/0x8c0 net/socket.c:2482
 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2536
 __sys_sendmsg+0xf3/0x1c0 net/socket.c:2565
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f97a4bf4e69
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdcaf10028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f97a4bf4e69
RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000006
RBP: 00007f97a4bb9010 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f97a4bb90a0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>


---
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