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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 79E05C432BE for ; Wed, 18 Aug 2021 03:26:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5573E600D4 for ; Wed, 18 Aug 2021 03:26:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236185AbhHRD0z (ORCPT ); Tue, 17 Aug 2021 23:26:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36052 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231207AbhHRD0y (ORCPT ); Tue, 17 Aug 2021 23:26:54 -0400 Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 16D64C061764; Tue, 17 Aug 2021 20:26:20 -0700 (PDT) Received: by mail-pl1-x62a.google.com with SMTP id n12so958245plf.4; Tue, 17 Aug 2021 20:26:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=jmiPhOCESicdvfFuj6THhsiLBc+/I7VEPM1Ey/NV9KE=; b=Mqzf2GWQaakc9VYcQ9iKSR9/71BwrOPczyjxedQ7LX2mLq83LfPWA0NSnmx3vz61TO hyZ5/rySTNhVQQqO+1W+kpT03vJDPnqq7FS8RR3/uKbcPLg3nZAE8QCtMZY7aoXWmrbe 8VhVPehHwqs1wCwDTdrpm1ZTAXmpeJ4fzR91gjEFcNx6dBnHjt2D4SChhxc2+FuHZ4vD H5ZWe2o0Y+AAMJ35by/ojAEusVJIt3fm4HDOH6Jq/v1qZ4BxVAa4fbpPtFeVsX5Hwysq HZMoEY3QrhoWuBlAxi09zmXhyTPxJ8jmmmCJkA7n/ZpIqFEVODFEBVC6ybw5EWCOg0TS m73g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=jmiPhOCESicdvfFuj6THhsiLBc+/I7VEPM1Ey/NV9KE=; b=hE3c3tGes/YVEA4gVcBNDHR9b5WEFlglMWrwf6xgSPDx1hBUDmb4o6oN4vse94C2mp R6LrvOMMsb5/A+4VFlKYF6TESEF2oIPmJ43z4vx6ednbma2UNjKZW3AkmjPb2XDors6I m+9UzSsXu5uxXB7CzPS8ERxJT4740CCP+cFN4WBBjeJ7kzIaErbzIgiqtTJQrEbuyncj tFsJEsKAObGUGom3Jkmu1oUExgM40meV4OT39Z2naa83iqTBrtIMKSg6PhI1fv9zlemj vwaVxS4+QHxGsM786ArSaJEBX4wivq9/0ofOa3ecnERhadxdRLI3PvgpkVSjg9l7wH62 R3qA== X-Gm-Message-State: AOAM530VmJCEseKVhJYBdtZdZIHQwyJEVHuh1JwKar+j7ktdhKq7RJgJ YcaeeEEgrCQf25UUMm6W6oA= X-Google-Smtp-Source: ABdhPJyk1sMK+ZXuDr8Bk5yw3mMIUAJlzJQFAD426qUqiky382ouaAG+iEY3s492xW/hYe/2FbjzLg== X-Received: by 2002:a17:90a:9285:: with SMTP id n5mr6797809pjo.29.1629257179526; Tue, 17 Aug 2021 20:26:19 -0700 (PDT) Received: from localhost.localdomain ([154.16.166.182]) by smtp.gmail.com with ESMTPSA id f23sm4125899pfd.61.2021.08.17.20.26.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 20:26:19 -0700 (PDT) From: Dongliang Mu To: Steffen Klassert , Herbert Xu , "David S. Miller" , Jakub Kicinski Cc: dan.carpenter@oracle.com, Dongliang Mu , syzbot+b9cfd1cc5d57ee0a09ab@syzkaller.appspotmail.com, stable@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] net: xfrm: assign the per_cpu_ptr pointer before return Date: Wed, 18 Aug 2021 11:25:53 +0800 Message-Id: <20210818032554.283428-1-mudongliangabcd@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In ipcomp_alloc_scratches, if the vmalloc fails, there leaves an oudated pointer in *per_cpu_ptr(scratches, i). However, in the error handling of ipcomp_init_state, if ipcomp_alloc_scratches fails, it will invoke ipcomp_free_scratches directly. This functio will vfree the per_cpu_ptr pointer. If the pointer points to an invalid memory, the kernel crashes. Fix this by moving the assignment of per_cpu_ptr point before return. Call Trace: ipcomp_free_scratches+0xbc/0x160 net/xfrm/xfrm_ipcomp.c:203 ipcomp_free_data net/xfrm/xfrm_ipcomp.c:312 [inline] ipcomp_init_state+0x77c/0xa40 net/xfrm/xfrm_ipcomp.c:364 ipcomp6_init_state+0xc2/0x700 net/ipv6/ipcomp6.c:154 __xfrm_init_state+0x995/0x15c0 net/xfrm/xfrm_state.c:2648 xfrm_init_state+0x1a/0x70 net/xfrm/xfrm_state.c:2675 pfkey_msg2xfrm_state net/key/af_key.c:1287 [inline] pfkey_add+0x1a64/0x2cd0 net/key/af_key.c:1504 pfkey_process+0x685/0x7e0 net/key/af_key.c:2837 pfkey_sendmsg+0x43a/0x820 net/key/af_key.c:3676 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 Reported-by: syzbot+b9cfd1cc5d57ee0a09ab@syzkaller.appspotmail.com Cc: stable@vger.kernel.org Fixes: 6fccab671f2f ("ipsec: ipcomp - Merge IPComp impl") Signed-off-by: Dongliang Mu --- net/xfrm/xfrm_ipcomp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/xfrm/xfrm_ipcomp.c b/net/xfrm/xfrm_ipcomp.c index cb40ff0ff28d..01dbec70dfba 100644 --- a/net/xfrm/xfrm_ipcomp.c +++ b/net/xfrm/xfrm_ipcomp.c @@ -223,9 +223,9 @@ static void * __percpu *ipcomp_alloc_scratches(void) void *scratch; scratch = vmalloc_node(IPCOMP_SCRATCH_SIZE, cpu_to_node(i)); + *per_cpu_ptr(scratches, i) = scratch; if (!scratch) return NULL; - *per_cpu_ptr(scratches, i) = scratch; } return scratches; -- 2.25.1