From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B501C282E3 for ; Thu, 23 May 2019 19:20:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 337C22133D for ; Thu, 23 May 2019 19:20:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558639217; bh=E8Fez+UjFAXlTw7Yz7IfL44Gcey0YmhWjuPBqO4+gB0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=q8RczMLUp1jknYzmHb1ZBlf8XKcyA6TvpL3W90khaxdvyJD/HzRaxFtaysQzyXf97 EufcKc19fUIE65M7sGFqMEO+OMs0E48g3EuZnDbBWSP5xSalacL/U4ADs42dJjG5/v bC3OEFcKjWKCiTOmBqoOlpsFdiDM9V4/6QkMCgOU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389990AbfEWTUQ (ORCPT ); Thu, 23 May 2019 15:20:16 -0400 Received: from mail.kernel.org ([198.145.29.99]:56814 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389472AbfEWTUN (ORCPT ); Thu, 23 May 2019 15:20:13 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 64DAF205ED; Thu, 23 May 2019 19:20:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558639212; bh=E8Fez+UjFAXlTw7Yz7IfL44Gcey0YmhWjuPBqO4+gB0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XjOhTnYUQWQaN4vqgTkjJ/+H0Uiag3ZhnsdE7/LEvKkiNMW3kp7znMakdGI6q3Kqb 36C9W1mO3SWCE1TAiWxwIxfTnJsxemC/Avnr0047qJNigThc36ziq+roNbki62pZY8 XPE4da1jaYc7gawQtGTmAALhA3XxkecyL8w6ocMQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hulk Robot , YueHaibing , Guillaume Nault , "David S. Miller" Subject: [PATCH 5.0 009/139] ppp: deflate: Fix possible crash in deflate_init Date: Thu, 23 May 2019 21:04:57 +0200 Message-Id: <20190523181721.579695988@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190523181720.120897565@linuxfoundation.org> References: <20190523181720.120897565@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: YueHaibing [ Upstream commit 3ebe1bca58c85325c97a22d4fc3f5b5420752e6f ] BUG: unable to handle kernel paging request at ffffffffa018f000 PGD 3270067 P4D 3270067 PUD 3271063 PMD 2307eb067 PTE 0 Oops: 0000 [#1] PREEMPT SMP CPU: 0 PID: 4138 Comm: modprobe Not tainted 5.1.0-rc7+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org 04/01/2014 RIP: 0010:ppp_register_compressor+0x3e/0xd0 [ppp_generic] Code: 98 4a 3f e2 48 8b 15 c1 67 00 00 41 8b 0c 24 48 81 fa 40 f0 19 a0 75 0e eb 35 48 8b 12 48 81 fa 40 f0 19 a0 74 RSP: 0018:ffffc90000d93c68 EFLAGS: 00010287 RAX: ffffffffa018f000 RBX: ffffffffa01a3000 RCX: 000000000000001a RDX: ffff888230c750a0 RSI: 0000000000000000 RDI: ffffffffa019f000 RBP: ffffc90000d93c80 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffa0194080 R13: ffff88822ee1a700 R14: 0000000000000000 R15: ffffc90000d93e78 FS: 00007f2339557540(0000) GS:ffff888237a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffa018f000 CR3: 000000022bde4000 CR4: 00000000000006f0 Call Trace: ? 0xffffffffa01a3000 deflate_init+0x11/0x1000 [ppp_deflate] ? 0xffffffffa01a3000 do_one_initcall+0x6c/0x3cc ? kmem_cache_alloc_trace+0x248/0x3b0 do_init_module+0x5b/0x1f1 load_module+0x1db1/0x2690 ? m_show+0x1d0/0x1d0 __do_sys_finit_module+0xc5/0xd0 __x64_sys_finit_module+0x15/0x20 do_syscall_64+0x6b/0x1d0 entry_SYSCALL_64_after_hwframe+0x49/0xbe If ppp_deflate fails to register in deflate_init, module initialization failed out, however ppp_deflate_draft may has been regiestred and not unregistered before return. Then the seconed modprobe will trigger crash like this. Reported-by: Hulk Robot Signed-off-by: YueHaibing Acked-by: Guillaume Nault Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ppp/ppp_deflate.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) --- a/drivers/net/ppp/ppp_deflate.c +++ b/drivers/net/ppp/ppp_deflate.c @@ -610,12 +610,20 @@ static struct compressor ppp_deflate_dra static int __init deflate_init(void) { - int answer = ppp_register_compressor(&ppp_deflate); - if (answer == 0) - printk(KERN_INFO - "PPP Deflate Compression module registered\n"); - ppp_register_compressor(&ppp_deflate_draft); - return answer; + int rc; + + rc = ppp_register_compressor(&ppp_deflate); + if (rc) + return rc; + + rc = ppp_register_compressor(&ppp_deflate_draft); + if (rc) { + ppp_unregister_compressor(&ppp_deflate); + return rc; + } + + pr_info("PPP Deflate Compression module registered\n"); + return 0; } static void __exit deflate_cleanup(void)