From patchwork Wed Mar 3 16:27:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Skripkin X-Patchwork-Id: 12114429 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=-15.8 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,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 DA230C433E6 for ; Wed, 3 Mar 2021 22:06:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A97364EED for ; Wed, 3 Mar 2021 22:06:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229589AbhCCVwZ (ORCPT ); Wed, 3 Mar 2021 16:52:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60464 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349003AbhCCQ3S (ORCPT ); Wed, 3 Mar 2021 11:29:18 -0500 Received: from mail-lf1-x12d.google.com (mail-lf1-x12d.google.com [IPv6:2a00:1450:4864:20::12d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EDB66C061762; Wed, 3 Mar 2021 08:28:32 -0800 (PST) Received: by mail-lf1-x12d.google.com with SMTP id q25so17831908lfc.8; Wed, 03 Mar 2021 08:28:32 -0800 (PST) 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=e6jk4zYBS5RjBAZNG1Jc1PukaUiIwiF3IBqy3w9hmmE=; b=BVFfZbLb/FeEe0raR3StYBDGVDr7EX5N7HR+g7owlm2IURTCIF/HOBRI03YTYuqbXF jywwE5g/Qr2634AGPScQqQZ32quudwZ7KqWjwszCuBZBb/QQduiNLOZmqI0CvZxJBav5 FTVlD/6w9RwzTBzlDIybudSexYk0YPtLLWHyGFkftBOX3MWf9vhrz8MLyO6SeA3rSgi4 G5euWldZ6kU0QG2RBFGMIvX0ZEXJco1BDjJICcq29HtG1dZV6IPaF9yeqhQLOyzZkmXI 4gKWrKZuv+ktwOl7R56zww/pDMCkfIAu7YWW3iGQb9poXB766giMAKNQ79eHN86519k3 Haew== 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=e6jk4zYBS5RjBAZNG1Jc1PukaUiIwiF3IBqy3w9hmmE=; b=A2AyNPrbyWTvxEywP60T82SYU6Ms+R2naiIPpGpzh9C3O8yLW3aycVnJkbUvERm8sr z6JdiuFpO1Q4wl5hdRcYxM7whDBRhjJL0t58wCvqZsZ5Jit3Jtck+bwqmSwCa5j4buiI hyyhJrwvpoJ3TPii24bwU7VCHdJkhU6vwX6qoyvjEaEun2syDphIDm5De2gDZDC2D5Qe kw4Axeb3tQiMZvROzDq4gCiaBxaTl4FEV2+Yh/2B4tqcHnr32JIJ19spc6ZLY1tgxlkp HwhPlFOvwI3Dwyv+CEWnwsTdtBfyMInEMjIq+10ZaD7/QNO9r6GHVHuLcYHfNe66wsoY 9Qrw== X-Gm-Message-State: AOAM530YBa4YMgdCfQy9MrG7m4mS3+rJ/6x9E5roUH25t7qSMi2rLoRy I5y/ysm5NXirEOhN+TRyB2m/7HVAOEaU8RG72E4= X-Google-Smtp-Source: ABdhPJzHo9T4zCaRaT2RXZe7050zl4QyZYHQQOAv+ZHRdXKF78eQwZLT0ljcRlyNCHQr+e/PesVdKQ== X-Received: by 2002:a19:8888:: with SMTP id k130mr14960980lfd.399.1614788911449; Wed, 03 Mar 2021 08:28:31 -0800 (PST) Received: from localhost.localdomain ([94.103.235.167]) by smtp.gmail.com with ESMTPSA id s7sm2084403lfi.140.2021.03.03.08.28.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Mar 2021 08:28:31 -0800 (PST) From: Pavel Skripkin To: alex.aring@gmail.com, stefan@datenfreihafen.org, davem@davemloft.net Cc: linux-wpan@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Pavel Skripkin , syzbot+12cf5fbfdeba210a89dd@syzkaller.appspotmail.com Subject: [PATCH] net: mac802154: Fix null pointer dereference Date: Wed, 3 Mar 2021 19:27:56 +0300 Message-Id: <20210303162757.763502-1-paskripkin@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wpan@vger.kernel.org syzbot found general protection fault in crypto_destroy_tfm()[1]. It was caused by wrong clean up loop in llsec_key_alloc(). If one of the tfm array members won't be initialized it will cause NULL dereference in crypto_destroy_tfm(). Call Trace: crypto_free_aead include/crypto/aead.h:191 [inline] [1] llsec_key_alloc net/mac802154/llsec.c:156 [inline] mac802154_llsec_key_add+0x9e0/0xcc0 net/mac802154/llsec.c:249 ieee802154_add_llsec_key+0x56/0x80 net/mac802154/cfg.c:338 rdev_add_llsec_key net/ieee802154/rdev-ops.h:260 [inline] nl802154_add_llsec_key+0x3d3/0x560 net/ieee802154/nl802154.c:1584 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Signed-off-by: Pavel Skripkin Reported-by: syzbot+12cf5fbfdeba210a89dd@syzkaller.appspotmail.com --- net/mac802154/llsec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/mac802154/llsec.c b/net/mac802154/llsec.c index 585d33144c33..6709f186f777 100644 --- a/net/mac802154/llsec.c +++ b/net/mac802154/llsec.c @@ -151,7 +151,7 @@ llsec_key_alloc(const struct ieee802154_llsec_key *template) err_tfm0: crypto_free_sync_skcipher(key->tfm0); err_tfm: - for (i = 0; i < ARRAY_SIZE(key->tfm); i++) + for (; i >= 0; i--) if (key->tfm[i]) crypto_free_aead(key->tfm[i]);