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Thu, 31 Dec 2020 13:09:16 -0800 (PST) Date: Thu, 31 Dec 2020 13:09:16 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000532e0205b7c90942@google.com> Subject: UBSAN: shift-out-of-bounds in gred_change From: syzbot To: davem@davemloft.net, jhs@mojatatu.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, xiyou.wangcong@gmail.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org 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@syzkaller.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@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches