From mboxrd@z Thu Jan 1 00:00:00 1970 From: Franchoze Eric Subject: null pointer at cls_api.c Date: Thu, 05 Aug 2010 23:24:15 +0400 Message-ID: <282881281036255@web101.yandex.ru> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit To: netdev@vger.kernel.org Return-path: Received: from forward9.mail.yandex.net ([77.88.61.48]:45089 "EHLO forward9.mail.yandex.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752388Ab0HETYR (ORCPT ); Thu, 5 Aug 2010 15:24:17 -0400 Received: from web101.yandex.ru (web101.yandex.ru [77.88.61.2]) by forward9.mail.yandex.net (Yandex) with ESMTP id DC41014D838C for ; Thu, 5 Aug 2010 23:24:15 +0400 (MSD) Received: from localhost (localhost.localdomain [127.0.0.1]) by web101.yandex.ru (Yandex) with ESMTP id D8FA1250023 for ; Thu, 5 Aug 2010 23:24:15 +0400 (MSD) Sender: netdev-owner@vger.kernel.org List-ID: Hello, can somebody follow up with approriate fix for that bug? It's reproducible on the latest 2.6.32.17 kernel with Centos5 user land. Script to reproduce is bellow. I did quick fix for that to show where is the issue. Thanks. --- net/sched/cls_api.c_orig 2010-08-05 10:46:01.000000000 -0700 +++ net/sched/cls_api.c 2010-08-05 12:03:01.000000000 -0700 @@ -255,6 +255,11 @@ replay: kfree(tp); goto errout; } + + if (!tp || !tp->ops) { + err = -ENOENT; + goto errout; + } tp->ops = tp_ops; tp->protocol = protocol; tp->prio = nprio ? : TC_H_MAJ(tcf_auto_prio(*back)); #!/bin/bash DEV=tun1 SPEED="100kbit" ISPEED="10Mbit" tc qdisc del dev $DEV root tc qdisc add dev $DEV root handle 1: htb default 1 tc class add dev $DEV parent 1: classid 1:1 htb rate ${ISPEED} tc class add dev $DEV parent 1:1 classid 1:2 htb rate ${SPEED} ceil ${SPEED} prio 0 tc qdisc add dev $DEV parent 1:2 handle 2: sfq perturb 10 tc filter add dev $DEV parent 2: protocol ip u32 match ip dport 80 0xffff flowid 2:1 BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<(null)>] (null) PGD 81ca27067 PUD 825b8e067 PMD 0 Oops: 0010 [#1] PREEMPT SMP last sysfs file: /sys/class/misc/watchdog/dev CPU 7 Modules linked in: wdt_pci sc520_wdt pcwd_pci i6300esb hpwdt cls_u32 sch_sfq sch_htb lockd sunrpc xt_connlimit xt_MARK iptable_mangle ipt_REDIRECT iptable_nat nf_nat tun ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack xt_tcpudp iptable_filter ip_tables x_tables dm_mirror dm_multipath scsi_dh sbs sbshc power_meter hwmon battery ac tpm_tis serio_raw rtc_cmos rtc_core rtc_lib tpm tpm_bios button tg3 firmware_class libphy amd64_edac_mod edac_core i2c_piix4 i2c_core dm_region_hash dm_log dm_mod sata_svw libata cciss sd_mod scsi_mod ext3 jbd Pid: 4807, comm: tc Not tainted 2.6.32.17-af #1 ProLiant DL165 G6 RIP: 0010:[<0000000000000000>] [<(null)>] (null) RSP: 0018:ffff880823547880 EFLAGS: 00010286 RAX: ffffffffa0292b80 RBX: ffff88082484f700 RCX: ffff880823547898 RDX: 0000000000020001 RSI: 0000000000000000 RDI: ffff88082568e000 RBP: ffff8808235478d8 R08: ffff880427c00040 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88082484f7c0 R12: ffff88082546603c R13: ffff88081ca8f440 R14: ffff88082484f7c0 R15: ffff880823547908 FS: 00007fb0ca8186e0(0000) GS:ffff880436440000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000008259ec000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process tc (pid: 4807, threadinfo ffff880823546000, task ffff880824b68800) Stack: ffffffffa0299836 ffff8808235478c8 0000000000000000 0000000000000000 <0> ffff88081ca8f440 ffff88082546603c ffff88081ca8f440 ffff88082546603c <0> 0000000080000800 ffff88082484f700 0000000000000000 ffff880823547998 Call Trace: [] ? u32_set_parms+0xca/0x14f [cls_u32] [] u32_change+0x316/0x3bd [cls_u32] [] ? kzalloc+0xf/0x11 [cls_u32] [] tc_ctl_tfilter+0x505/0x5f6 [] ? ____cache_alloc+0x1d/0x223 [] rtnetlink_rcv_msg+0x1c3/0x1e2 [] ? rtnetlink_rcv_msg+0x0/0x1e2 [] netlink_rcv_skb+0x3e/0x8d [] rtnetlink_rcv+0x20/0x29 [] netlink_unicast+0xed/0x154 [] netlink_sendmsg+0x245/0x258 [] ? netlink_unicast+0xfd/0x154 [] __sock_sendmsg+0x59/0x62 [] sock_sendmsg+0xc7/0xe0 [] ? autoremove_wake_function+0x0/0x38 [] ? autoremove_wake_function+0x0/0x38 [] ? move_addr_to_kernel+0x40/0x49 [] ? verify_iovec+0x4f/0x94 [] sys_sendmsg+0x1de/0x24d [] ? lru_cache_add_lru+0x38/0x3d [] ? page_add_new_anon_rmap+0x3a/0x49 [] ? handle_mm_fault+0x5e8/0x602 [] system_call_fastpath+0x16/0x1b Code: Bad RIP value. RIP [<(null)>] (null) RSP CR2: 0000000000000000 ---[ end trace 62c007c0b888891e ]---