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Message-ID: <000000000000532e0205b7c90942@google.com>
Date: Thu, 31 Dec 2020 13:09:16 -0800
From: syzbot <syzbot+1819b70451246ed8cf57@...kaller.appspotmail.com>
To: davem@...emloft.net, jhs@...atatu.com, jiri@...nulli.us,
kuba@...nel.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
xiyou.wangcong@...il.com
Subject: UBSAN: shift-out-of-bounds in gred_change
Hello,
syzbot found the following issue on:
HEAD commit: 3db1a3fa Merge tag 'staging-5.11-rc1' of git://git.kernel...
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=155708db500000
kernel config: https://syzkaller.appspot.com/x/.config?x=2ae878fbf640b72b
dashboard link: https://syzkaller.appspot.com/bug?extid=1819b70451246ed8cf57
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=176b78c0d00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12993797500000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1819b70451246ed8cf57@...kaller.appspotmail.com
IPVS: ftp: loaded support on port[0] = 21
================================================================================
UBSAN: shift-out-of-bounds in ./include/net/red.h:252:22
shift exponent 255 is too large for 32-bit type 'int'
CPU: 0 PID: 8465 Comm: syz-executor194 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:120
ubsan_epilogue+0xb/0x5a lib/ubsan.c:148
__ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:395
red_set_parms include/net/red.h:252 [inline]
gred_change_vq net/sched/sch_gred.c:506 [inline]
gred_change.cold+0xce/0xe2 net/sched/sch_gred.c:702
qdisc_change net/sched/sch_api.c:1331 [inline]
tc_modify_qdisc+0xd4e/0x1a30 net/sched/sch_api.c:1633
rtnetlink_rcv_msg+0x493/0xb40 net/core/rtnetlink.c:5564
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
netlink_sendmsg+0x907/0xe10 net/netlink/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xd3/0x130 net/socket.c:672
____sys_sendmsg+0x6e8/0x810 net/socket.c:2336
___sys_sendmsg+0xf3/0x170 net/socket.c:2390
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2423
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440e69
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 0b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff634be6d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004a2730 RCX: 0000000000440e69
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 00007fff634be6e0 R08: 0000000120080522 R09: 0000000120080522
R10: 0000000120080522 R11: 0000000000000246 R12: 00000000004a2730
R13: 0000000000402390 R14: 0000000000000000 R15: 0000000000000000
================================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.
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https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
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