From patchwork Mon Aug 7 11:07:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Min Li X-Patchwork-Id: 712429 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E896CC001DB for ; Mon, 7 Aug 2023 11:07:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231804AbjHGLHy (ORCPT ); Mon, 7 Aug 2023 07:07:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45124 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231133AbjHGLHw (ORCPT ); Mon, 7 Aug 2023 07:07:52 -0400 Received: from mail-pl1-x62f.google.com (mail-pl1-x62f.google.com [IPv6:2607:f8b0:4864:20::62f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2DC3B83; Mon, 7 Aug 2023 04:07:50 -0700 (PDT) Received: by mail-pl1-x62f.google.com with SMTP id d9443c01a7336-1bc4dc65aa7so5883055ad.0; Mon, 07 Aug 2023 04:07:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1691406469; x=1692011269; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=t9OuBtIRd3TmVP55IsTuJa78bggwEoR7iVTgrkvRd/k=; b=Ct0Nla8VUY8ybYOsRxm5aDgm6jzAOjxj6XMVTgcCuiAC2A+CzL4xGxaGR7Gp4omn/U wnEQ7GzfmRBBtoppvtsQqT7OBM+vOCD0nftNLtbJ4GhbUHo+UgKh8NGarM1EeW+tbJj8 uF9tOJu8w/hAbb5fUxP7dMYiweA3LPOfKHHvVOivmSR5NDDQ+gsAoT9ka+zl4NevmGcb 5k75EQ64uWLiHn/c9fYf63atsflMYKsrjbiX0k+WEtPQn13yfpcjYWQDRXsAbLUSOGs0 VEoszIUnkZ4TnloPndIe+6oW5bu6dFL4Bss5eDePuj7TcbwSAMum0+LmT2M/79mlN3bh zWkg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691406469; x=1692011269; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=t9OuBtIRd3TmVP55IsTuJa78bggwEoR7iVTgrkvRd/k=; b=UBgTHNbclDw8CTFfWAyjmJrjYrB6BIY+gwSob32NBZp7z2qdOZTKZorQKUvBfJtVh5 9TpeOZFYOpbMsG2RURrhr93L7/m5yB4aZkLxzanv6MTCcAn9ZnaSBO4g4z2TsOqx2/eM dUL2Xk+oP4aSR07zLBvihPMB17JNmbfZFcLwybRkLpaVYkNH7M6KqmMUcErXl4bw0hPU kRJBul52fIaj+fTkgqzpGgorML9LxFUqTSOWggdMk6kL1yvtvquZyPCbghDl/x4X6+SZ sKp8qM2or2O1j0ew0R2HJZuLNW1vVtHEkT8BKrJIGbpnmHnj/JVqfTZtw3xeMfCQGltR EOCQ== X-Gm-Message-State: ABy/qLYRpBnZL4N2a/bxT6sYUC0Bdqop7KXpxYcn5tTApnsYcD/mwqyE TTjYVan5uBEKr5Gk6lafTddsb9crdpRhmg== X-Google-Smtp-Source: APBJJlHIKrHkeRxQvdKkND5ibuxu3DylP1Q9CVX/BYjyp1AOyRKSEwcYUEsAP/kDNY/3u8oRWywtag== X-Received: by 2002:a17:903:1c7:b0:1b8:b55d:4cff with SMTP id e7-20020a17090301c700b001b8b55d4cffmr32901861plh.2.1691406469500; Mon, 07 Aug 2023 04:07:49 -0700 (PDT) Received: from ubuntu.localdomain ([103.114.158.1]) by smtp.gmail.com with ESMTPSA id p9-20020a1709026b8900b001b9da8b4eb7sm6603524plk.35.2023.08.07.04.07.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Aug 2023 04:07:49 -0700 (PDT) From: Min Li To: luiz.dentz@gmail.com Cc: marcel@holtmann.org, johan.hedberg@gmail.com, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] Bluetooth: Fix potential use-after-free when clear keys Date: Mon, 7 Aug 2023 19:07:41 +0800 Message-Id: <20230807110741.85859-1-lm0963hack@gmail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Similar to commit c5d2b6fa26b5 ("Bluetooth: Fix use-after-free in hci_remove_ltk/hci_remove_irk"). We can not access k after kfree_rcu() call. Fixes: d7d41682efc2 ("Bluetooth: Fix Suspicious RCU usage warnings") Signed-off-by: Min Li --- net/bluetooth/hci_core.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index a856b1051d35..bae8a9919dbe 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -1074,9 +1074,9 @@ void hci_uuids_clear(struct hci_dev *hdev) void hci_link_keys_clear(struct hci_dev *hdev) { - struct link_key *key; + struct link_key *key, *tmp; - list_for_each_entry(key, &hdev->link_keys, list) { + list_for_each_entry_safe(key, tmp, &hdev->link_keys, list) { list_del_rcu(&key->list); kfree_rcu(key, rcu); } @@ -1084,9 +1084,9 @@ void hci_link_keys_clear(struct hci_dev *hdev) void hci_smp_ltks_clear(struct hci_dev *hdev) { - struct smp_ltk *k; + struct smp_ltk *k, *tmp; - list_for_each_entry(k, &hdev->long_term_keys, list) { + list_for_each_entry_safe(k, tmp, &hdev->long_term_keys, list) { list_del_rcu(&k->list); kfree_rcu(k, rcu); } @@ -1094,9 +1094,9 @@ void hci_smp_ltks_clear(struct hci_dev *hdev) void hci_smp_irks_clear(struct hci_dev *hdev) { - struct smp_irk *k; + struct smp_irk *k, *tmp; - list_for_each_entry(k, &hdev->identity_resolving_keys, list) { + list_for_each_entry_safe(k, tmp, &hdev->identity_resolving_keys, list) { list_del_rcu(&k->list); kfree_rcu(k, rcu); } @@ -1104,9 +1104,9 @@ void hci_smp_irks_clear(struct hci_dev *hdev) void hci_blocked_keys_clear(struct hci_dev *hdev) { - struct blocked_key *b; + struct blocked_key *b, *tmp; - list_for_each_entry(b, &hdev->blocked_keys, list) { + list_for_each_entry_safe(b, tmp, &hdev->blocked_keys, list) { list_del_rcu(&b->list); kfree_rcu(b, rcu); }