Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759812AbZDCHRU (ORCPT ); Fri, 3 Apr 2009 03:17:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751334AbZDCHRE (ORCPT ); Fri, 3 Apr 2009 03:17:04 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:49907 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751079AbZDCHRC (ORCPT ); Fri, 3 Apr 2009 03:17:02 -0400 Date: Fri, 3 Apr 2009 09:16:38 +0200 From: Ingo Molnar To: Pekka Enberg Cc: Yinghai Lu , David Miller , "linux-kernel@vger.kernel.org" , Trond Myklebust , chuck.lever@oracle.com, Tom Talpey Subject: [PATCH] nfs: fix nfs_parse_mount_options() double kfree() Message-ID: <20090403071638.GB14498@elte.hu> References: <86802c440904021512o2405ffa2gcbe057b9f81d5a46@mail.gmail.com> <20090402222106.GC9239@elte.hu> <49D56415.1080402@kernel.org> <84144f020904022252v2dbc18f5o35cc9737bf6d146d@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <84144f020904022252v2dbc18f5o35cc9737bf6d146d@mail.gmail.com> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5230 Lines: 104 Impact: fix crash Yinghai Lu reported the following crash: > mpk12-3214-189-158:~ # sh x > [ ? 63.198629] ------------[ cut here ]------------ > [ ? 63.202589] kernel BUG at mm/slub.c:2753! > [ ? 63.202589] invalid opcode: 0000 [#1] SMP > [ ? 63.202589] last sysfs file: /sys/devices/virtual/net/sit0/type > [ ? 63.202589] CPU 0 > [ ? 63.202589] Modules linked in: > [ ? 63.202589] Pid: 10027, comm: mount.nfs Not tainted 2.6.29-07100-g833bb30 #21 Sun Fire X4440 > [ ? 63.202589] RIP: 0010:[] ?[] kfree+0x5a/0xcd > [ ? 63.202589] RSP: 0018:ffff882042ceb9f8 ?EFLAGS: 00010246 > [ ? 63.202589] RAX: 0200000000000000 RBX: 0000000000000005 RCX: ffffffff80a7dc1f > [ ? 63.202589] RDX: ffffe20000000000 RSI: ffffc2000000f470 RDI: ffffe2001c018950 > [ ? 63.202589] RBP: ffff882042ceba18 R08: 0000000000000000 R09: ffffffff811019c0 > [ ? 63.202589] R10: 000000004262ce02 R11: ffff882042ceba18 R12: ffff880800706475 > [ ? 63.202589] R13: ffff882042886000 R14: ffff882042cebbd8 R15: ffff882042cebbf0 > [ ? 63.202589] FS: ?00007fac729ed6f0(0000) GS:ffffc20000000000(0000) knlGS:0000000000000000 > [ ? 63.202589] CS: ?0010 DS: 0000 ES: 0000 CR0: 000000008005003b > [ ? 63.202589] CR2: 00007fac72c12000 CR3: 0000001841cbb000 CR4: 00000000000006e0 > [ ? 63.202589] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ ? 63.202589] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > [ ? 63.202589] Process mount.nfs (pid: 10027, threadinfo ffff882042cea000, task ffff8820434dc290) > [ ? 63.202589] Stack: > [ ? 63.202589] ?ffff882042ceba18 000000004262ce02 0000000000000005 ffff882042886028 > [ ? 63.202589] ?ffff882042ceba58 ffffffff80a7dc1f 000000004262ce02 ffff882042886000 > [ ? 63.202589] ?000000004262ce02 ffff882042886000 ffffffff80a7b4a6 ffff882042c9ee18 > [ ? 63.202589] Call Trace: > [ ? 63.202589] ?[] xs_destroy+0x67/0xac > [ ? 63.202589] ?[] ? xprt_destroy+0x0/0xa7 > [ ? 63.202589] ?[] xprt_destroy+0x8c/0xa7 > [ ? 63.202589] ?[] ? put_rpccred+0x112/0x131 > [ ? 63.202589] ?[] kref_put+0x65/0x87 > [ ? 63.202589] ?[] ? rpc_free_client+0x0/0xf9 > [ ? 63.202589] ?[] xprt_put+0x23/0x39 > [ ? 63.202589] ?[] rpc_free_client+0xd1/0xf9 > [ ? 63.202589] ?[] ? unx_destroy+0x3c/0x57 > [ ? 63.202589] ?[] kref_put+0x65/0x87 > [ ? 63.202589] ?[] ? rpc_free_auth+0x0/0x69 > [ ? 63.202589] ?[] rpc_free_auth+0x4e/0x69 > [ ? 63.202589] ?[] ? __wake_up+0x52/0x75 > [ ? 63.202589] ?[] kref_put+0x65/0x87 > [ ? 63.202589] ?[] rpc_release_client+0x64/0x7f > [ ? 63.202589] ?[] ? rpc_put_task+0xb0/0xcb > [ ? 63.202589] ?[] rpc_shutdown_client+0xd5/0xf8 > [ ? 63.202589] ?[] ? rpc_call_sync+0x63/0x80 > [ ? 63.202589] ?[] nfs_mount+0x11f/0x1bf > [ ? 63.202589] ?[] nfs_get_sb+0x4ac/0x82a > [ ? 63.202589] ?[] vfs_kern_mount+0x61/0xbf > [ ? 63.202589] ?[] ? get_fs_type+0x58/0xc5 > [ ? 63.202589] ?[] do_kern_mount+0x56/0x108 > [ ? 63.202589] ?[] do_mount+0x729/0x788 > [ ? 63.202589] ?[] ? copy_mount_options+0xdf/0x155 > [ ? 63.202589] ?[] sys_mount+0x98/0xf8 > [ ? 63.202589] ?[] system_call_fastpath+0x16/0x1b > [ ? 63.202589] Code: 0c 48 ba 00 00 00 00 00 e2 ff ff 48 6b c0 38 48 8d 3c 10 48 8b 07 f6 c4 40 74 04 48 8b 7f 10 48 8b 07 84 c0 78 10 f6 c4 60 75 04 <0f> 0b eb fe e8 90 75 fd ff eb 4c 48 8b 4d 08 4c 8b 4f 10 9c 5b > [ ? 63.202589] RIP ?[] kfree+0x5a/0xcd > [ ? 63.202589] ?RSP > [ ? 63.524555] ---[ end trace cd0d38e02ad11d61 ]--- Pekka observed that a bogus pointer was passed to kfree(). This commit: a67d18f: NFS: load the rpc/rdma transport module automatically Moved a kfree() of the options strings in nfs_parse_mount_options() inadvertently and introduced a double kfree(). Fix it. Reported-by: Yinghai Lu Analyzed-by: Pekka Enberg Signed-off-by: Ingo Molnar --- fs/nfs/super.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/fs/nfs/super.c b/fs/nfs/super.c index 0942fcb..4e7f879 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -1191,7 +1191,6 @@ static int nfs_parse_mount_options(char *raw, goto out_nomem; token = match_token(string, nfs_xprt_protocol_tokens, args); - kfree(string); switch (token) { case Opt_xprt_udp: @@ -1221,6 +1220,7 @@ static int nfs_parse_mount_options(char *raw, goto out_nomem; token = match_token(string, nfs_xprt_protocol_tokens, args); + kfree(string); switch (token) { case Opt_xprt_udp: -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/