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Tue, 2 Jun 2020 04:46:52 +0000 From: Tuong Lien To: davem@davemloft.net, jmaloy@redhat.com, maloy@donjonn.com, ying.xue@windriver.com, netdev@vger.kernel.org Cc: tipc-discussion@lists.sourceforge.net Subject: [net 1/2] Revert "tipc: Fix potential tipc_node refcnt leak in tipc_rcv" Date: Tue, 2 Jun 2020 11:46:40 +0700 Message-Id: <20200602044641.10535-2-tuong.t.lien@dektech.com.au> X-Mailer: git-send-email 2.13.7 In-Reply-To: <20200602044641.10535-1-tuong.t.lien@dektech.com.au> References: <20200602044641.10535-1-tuong.t.lien@dektech.com.au> X-ClientProxiedBy: SGBP274CA0007.SGPP274.PROD.OUTLOOK.COM (2603:1096:4:b0::19) To AM6PR0502MB3925.eurprd05.prod.outlook.com (2603:10a6:209:5::28) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from dektech.com.au (14.161.14.188) by SGBP274CA0007.SGPP274.PROD.OUTLOOK.COM (2603:1096:4:b0::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.20.3045.17 via Frontend Transport; Tue, 2 Jun 2020 04:46:50 +0000 X-Mailer: git-send-email 2.13.7 X-Originating-IP: [14.161.14.188] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 99e1ea4b-dec2-4a4c-124e-08d806aff7c8 X-MS-TrafficTypeDiagnostic: AM6SPR01MB0038: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:1923; 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There is no actual tipc_node refcnt leak as stated in the above commit. The refcnt is hold carefully for the case of an asynchronous decryption (i.e. -EINPROGRESS/-EBUSY and skb = NULL is returned), so that the node object cannot be freed in the meantime. The counter will be re-balanced when the operation's callback arrives with the decrypted buffer if any. In other cases, e.g. a synchronous crypto the counter will be decreased immediately when it is done. Now with that commit, a kernel panic will occur when there is no node found (i.e. n = NULL) in the 'tipc_rcv()' or a premature release of the node object. This commit solves the issues by reverting the said commit, but keeping one valid case that the 'skb_linearize()' is failed. Acked-by: Jon Maloy Signed-off-by: Tuong Lien Tested-by: Hoang Le --- net/tipc/node.c | 1 - 1 file changed, 1 deletion(-) diff --git a/net/tipc/node.c b/net/tipc/node.c index 0312fb181d94..a4c2816c3746 100644 --- a/net/tipc/node.c +++ b/net/tipc/node.c @@ -2038,7 +2038,6 @@ void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b) n = tipc_node_find_by_id(net, ehdr->id); } tipc_crypto_rcv(net, (n) ? n->crypto_rx : NULL, &skb, b); - tipc_node_put(n); if (!skb) return; From patchwork Tue Jun 2 04:46:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tuong Lien X-Patchwork-Id: 1302068 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; 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dkim=none (message not signed) header.d=none;davemloft.net; dmarc=none action=none header.from=dektech.com.au; Received: from AM6PR0502MB3925.eurprd05.prod.outlook.com (2603:10a6:209:5::28) by AM6SPR01MB0038.eurprd05.prod.outlook.com (2603:10a6:20b:3b::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3045.17; Tue, 2 Jun 2020 04:46:54 +0000 Received: from AM6PR0502MB3925.eurprd05.prod.outlook.com ([fe80::4d5f:2ab:5a66:deaf]) by AM6PR0502MB3925.eurprd05.prod.outlook.com ([fe80::4d5f:2ab:5a66:deaf%7]) with mapi id 15.20.3045.024; Tue, 2 Jun 2020 04:46:54 +0000 From: Tuong Lien To: davem@davemloft.net, jmaloy@redhat.com, maloy@donjonn.com, ying.xue@windriver.com, netdev@vger.kernel.org Cc: tipc-discussion@lists.sourceforge.net Subject: [net 2/2] Revert "tipc: Fix potential tipc_aead refcnt leak in tipc_crypto_rcv" Date: Tue, 2 Jun 2020 11:46:41 +0700 Message-Id: <20200602044641.10535-3-tuong.t.lien@dektech.com.au> X-Mailer: git-send-email 2.13.7 In-Reply-To: <20200602044641.10535-1-tuong.t.lien@dektech.com.au> References: <20200602044641.10535-1-tuong.t.lien@dektech.com.au> X-ClientProxiedBy: SGBP274CA0007.SGPP274.PROD.OUTLOOK.COM (2603:1096:4:b0::19) To AM6PR0502MB3925.eurprd05.prod.outlook.com (2603:10a6:209:5::28) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from dektech.com.au (14.161.14.188) by SGBP274CA0007.SGPP274.PROD.OUTLOOK.COM (2603:1096:4:b0::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.20.3045.17 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: st32RJT1gGWmoYMhmtp3C+vtOCi9GAouTJay8l/OXN9OCftYF6oam0ubew0L7sG4SLRrwhxxhe78u256LzwZkwSiF0DUcr5lvMNCiIdFQTWGXftfy+cRtJrzAemg1KiAYGWEuSRnrxt7iWQKdPOmBGCotc0Nm3o42zk+NIRPXliW+LuIz4LkQ10GxPgDglWn3IQdXOsb8lhCXVy7uDILhyniRMxkKBhz/YhehEZ9nV17vl03TqVtCe8ZUFoRybrvT18k+tObRcvcrvXNogg+osPgbM2eP+A+u0V5PqRrcT9WLmBFWEqRxyLzsqwWyJaAX4exYsYoC13+g8MP/M5DHcPfQEbs4GZhSQJmIZp6kVmlde7Md3znX83k2E9zoAIM6FtyWnVLGQJvsqKTLia0F4VvK+OCJBcn84lfPQ1AiCFTukguWXWst8uBc8LWofvrX8SFnB/pyWn6fH5YdnLbsSXDIA6CWBuL2s3gFXNB+94= X-OriginatorOrg: dektech.com.au X-MS-Exchange-CrossTenant-Network-Message-Id: bfef5b0a-15d0-4e91-ee7e-08d806aff908 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Jun 2020 04:46:54.3458 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 1957ea50-0dd8-4360-8db0-c9530df996b2 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: ArPtkSdMm//1V1vGRvaKOa7mI639uVqvHs/pqgGX7n/i/CIiRL48S5fQrSFx+4qdsuUpiabD0VD0QTUcOHhidezsCa30lG2aXe7dBHgmLDs= X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6SPR01MB0038 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This reverts commit 441870ee4240cf67b5d3ab8e16216a9ff42eb5d6. Like the previous patch in this series, we revert the above commit that causes similar issues with the 'aead' object. Acked-by: Jon Maloy Signed-off-by: Tuong Lien --- net/tipc/crypto.c | 1 - 1 file changed, 1 deletion(-) diff --git a/net/tipc/crypto.c b/net/tipc/crypto.c index 8c47ded2edb6..c8c47fc72653 100644 --- a/net/tipc/crypto.c +++ b/net/tipc/crypto.c @@ -1712,7 +1712,6 @@ int tipc_crypto_rcv(struct net *net, struct tipc_crypto *rx, case -EBUSY: this_cpu_inc(stats->stat[STAT_ASYNC]); *skb = NULL; - tipc_aead_put(aead); return rc; default: this_cpu_inc(stats->stat[STAT_NOK]);