From mboxrd@z Thu Jan 1 00:00:00 1970 From: Johan Hovold Date: Sat, 26 Feb 2011 17:45:05 +0000 Subject: dccp: null-pointer dereference on close Message-Id: <20110226174505.GB3609@localhost> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="macroman" Content-Transfer-Encoding: base64 To: dccp@vger.kernel.org SGksCgpJIHRyaWdnZXJlZCB0aGUgbnVsbC1wb2ludGVyIGRlcmVmZXJlbmNlIGJlbG93IHdoZW4g Y2xvc2luZyBhIGRjY3AKc29ja2V0IG9uIDIuNi4zNyB0aGUgb3RoZXIgZGF5LiBUaGUgcmVjZWl2 ZSBwYXRoIGlzIGhpdCBkdXJpbmcKY2xvc2UsIGFuZCB0aGUgc29ja2V0IGhhcyBhbHJlYWR5IGJl ZW4gdW5oYXNoZWQgaW4gZGNjcF9zZXRfc3RhdGUgZnJvbQpkY2NwX2Nsb3NlLgoKVGhhbmtzLApK b2hhbgoKCnJvb3RAb3Zlcm86fiMgWzg0MTQwLjEyODYzMV0gLS0tLS0tLS0tLS0tWyBjdXQgaGVy ZSBdLS0tLS0tLS0tLS0tCls4NDE0MC4xMzM1NzVdIFdBUk5JTkc6IGF0IG5ldC9pcHY0L2luZXRf dGltZXdhaXRfc29jay5jOjE0MSBfX2luZXRfdHdza19oYXNoZGFuY2UrMHg0OC8weDEyOCgpCls4 NDE0MC4xNDI1MTddIE1vZHVsZXMgbGlua2VkIGluOiBhcmM0IGVjYiBjYXJsOTE3MCBydDI4NzBz 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c3luY2luZzogRmF0YWwgZXhjZXB0aW9uIGluIGludGVycnVwdAoKLS0KVG8gdW5zdWJzY3JpYmUg ZnJvbSB0aGlzIGxpc3Q6IHNlbmQgdGhlIGxpbmUgInVuc3Vic2NyaWJlIGRjY3AiIGluCnRoZSBi b2R5IG9mIGEgbWVzc2FnZSB0byBtYWpvcmRvbW9Admdlci5rZXJuZWwub3JnCk1vcmUgbWFqb3Jk b21vIGluZm8gYXQgIGh0dHA6Ly92Z2VyLmtlcm5lbC5vcmcvbWFqb3Jkb21vLWluZm8uaHRtbA== From mboxrd@z Thu Jan 1 00:00:00 1970 From: Johan Hovold Subject: dccp: null-pointer dereference on close Date: Sat, 26 Feb 2011 18:45:05 +0100 Message-ID: <20110226174505.GB3609@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: "David S. Miller" , dccp@vger.kernel.org, netdev@vger.kernel.org To: Arnaldo Carvalho de Melo Return-path: Received: from mail-fx0-f46.google.com ([209.85.161.46]:41244 "EHLO mail-fx0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751511Ab1BZRpK (ORCPT ); Sat, 26 Feb 2011 12:45:10 -0500 Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-ID: Hi, I triggered the null-pointer dereference below when closing a dccp socket on 2.6.37 the other day. The receive path is hit during close, and the socket has already been unhashed in dccp_set_state from dccp_close. Thanks, Johan root@overo:~# [84140.128631] ------------[ cut here ]------------ [84140.133575] WARNING: at net/ipv4/inet_timewait_sock.c:141 __inet_twsk_hashdance+0x48/0x128() [84140.142517] Modules linked in: arc4 ecb carl9170 rt2870sta(C) mac80211 r8712u(C) crc_ccitt ah [84140.151794] [] (unwind_backtrace+0x0/0xec) from [] (warn_slowpath_common) [84140.161743] [] (warn_slowpath_common+0x4c/0x64) from [] (warn_slowpath_n) [84140.171966] [] (warn_slowpath_null+0x1c/0x24) from [] (__inet_twsk_hashd) [84140.182373] [] (__inet_twsk_hashdance+0x48/0x128) from [] (dccp_time_wai) [84140.192413] [] (dccp_time_wait+0x40/0xc8) from [] (dccp_rcv_state_proces) [84140.202636] [] (dccp_rcv_state_process+0x120/0x538) from [] (dccp_v4_do_) [84140.213043] [] (dccp_v4_do_rcv+0x11c/0x14c) from [] (release_sock+0xac/0) [84140.222442] [] (release_sock+0xac/0x110) from [] (dccp_close+0x28c/0x380) [84140.231475] [] (dccp_close+0x28c/0x380) from [] (inet_release+0x64/0x70) [84140.240386] [] (inet_release+0x64/0x70) from [] (sock_release+0x24/0xb8) [84140.249328] [] (sock_release+0x24/0xb8) from [] (sock_close+0x24/0x34) [84140.258087] [] (sock_close+0x24/0x34) from [] (fput+0x108/0x1f4) [84140.266296] [] (fput+0x108/0x1f4) from [] (filp_close+0x70/0x7c) [84140.274505] [] (filp_close+0x70/0x7c) from [] (sys_close+0xb4/0x10c) [84140.283081] [] (sys_close+0xb4/0x10c) from [] (ret_fast_syscall+0x0/0x30) [84140.292114] ---[ end trace b8877ec9d542c32e ]--- [84140.296997] Unable to handle kernel NULL pointer dereference at virtual address 00000010 [84140.305541] pgd = cedb0000 [84140.308410] [00000010] *pgd=8ed22031, *pte=00000000, *ppte=00000000 [84140.315032] Internal error: Oops: 17 [#1] PREEMPT [84140.320007] last sysfs file: /sys/kernel/uevent_seqnum [84140.325408] Modules linked in: arc4 ecb carl9170 rt2870sta(C) mac80211 r8712u(C) crc_ccitt ah [84140.334533] CPU: 0 Tainted: G WC (2.6.37+ #47) [84140.340332] PC is at __inet_twsk_hashdance+0x4c/0x128 [84140.345642] LR is at warn_slowpath_null+0x1c/0x24 [84140.350616] pc : [] lr : [] psr: 60000013 [84140.350616] sp : ce975e68 ip : ce975db8 fp : cfbc5c00 [84140.362701] r10: cfa3e400 r9 : cfbc5c18 r8 : 00000000 [84140.368225] r7 : 00000006 r6 : cfa96110 r5 : cfa3e400 r4 : cfb54000 [84140.375091] r3 : 00000002 r2 : 00000006 r1 : 00000000 r0 : 00000000 [84140.381988] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [84140.389495] Control: 10c5387d Table: 8edb0019 DAC: 00000015 [84140.395538] Process be2p_ctrl (pid: 2207, stack limit = 0xce9742f0) [84140.402160] Stack: (0xce975e68 to 0xce976000) [84140.406738] 5e60: cfb54000 00000180 cfa3e400 c031caa0 00000007 cfbc5c00 [84140.415374] 5e80: cfbc9824 00000020 00000007 c031c15c 00000000 00000022 00000000 00000008 [84140.424011] 5ea0: 00000001 cfbc5c00 cfbc5c00 cfa3e400 cfbc9824 00000000 00000001 c04c11b8 [84140.432617] 5ec0: be8ffc1c c032609c fa200000 c0033608 cfa3e400 cfa3e7b0 be8ffc1c ce975ee8 [84140.441253] 5ee0: be8ffc1c cfbc5c00 cfa3e400 ce974000 00000000 c0286594 cfa3e474 cfa3e400 [84140.449859] 5f00: cfa3e408 00000007 cf487c20 cf805840 cf60ca00 c031fd34 00000000 00000000 [84140.458496] 5f20: cfb20288 cfa3e400 cf487c00 00000008 00000000 c02d9a78 00000003 00000000 [84140.467102] 5f40: cf487c00 c0284ddc 00000000 cfb20288 cfb20280 c0284e94 00000000 c00c2e4c [84140.475738] 5f60: 00000000 00000000 cfb20280 00000000 cfbc50c0 00000006 c0033c04 ce974000 [84140.484375] 5f80: 00000000 c00c0104 00000004 cfbc50c0 cfb20280 c00c01c4 400a1000 00000000 [84140.492980] 5fa0: 0000891c c0033a80 400a1000 00000000 00000004 00000000 403d3014 00000000 [84140.501617] 5fc0: 400a1000 00000000 0000891c 00000006 00000000 00000000 400a9000 be8ffc1c [84140.510223] 5fe0: 00000000 be8ffbe0 00009584 4036320c 60000010 00000004 00005153 bf0fa7d0 [84140.518859] [] (__inet_twsk_hashdance+0x4c/0x128) from [] (dccp_time_wai) [84140.528869] [] (dccp_time_wait+0x40/0xc8) from [] (dccp_rcv_state_proces) [84140.539062] [] (dccp_rcv_state_process+0x120/0x538) from [] (dccp_v4_do_) [84140.549407] [] (dccp_v4_do_rcv+0x11c/0x14c) from [] (release_sock+0xac/0) [84140.558776] [] (release_sock+0xac/0x110) from [] (dccp_close+0x28c/0x380) [84140.567779] [] (dccp_close+0x28c/0x380) from [] (inet_release+0x64/0x70) [84140.576660] [] (inet_release+0x64/0x70) from [] (sock_release+0x24/0xb8) [84140.585571] [] (sock_release+0x24/0xb8) from [] (sock_close+0x24/0x34) [84140.594299] [] (sock_close+0x24/0x34) from [] (fput+0x108/0x1f4) [84140.602447] [] (fput+0x108/0x1f4) from [] (filp_close+0x70/0x7c) [84140.610626] [] (filp_close+0x70/0x7c) from [] (sys_close+0xb4/0x10c) [84140.619171] [] (sys_close+0xb4/0x10c) from [] (ret_fast_syscall+0x0/0x30) [84140.628143] Code: e59f00dc e3a0108d ebf6782a e5941044 (e5912010) [84140.634643] ---[ end trace b8877ec9d542c32f ]--- [84140.639526] Kernel panic - not syncing: Fatal exception in interrupt