From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 6DDACA04A2 for ; Mon, 18 May 2020 10:24:15 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 4D4EA1D536; Mon, 18 May 2020 10:24:15 +0200 (CEST) Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by dpdk.org (Postfix) with ESMTP id 4F41E1D170; Mon, 18 May 2020 10:24:11 +0200 (CEST) IronPort-SDR: m7DvsGa2mc9f98kW4hrpavFllCkGQthf23ARLZEY2FKJ3aWxRYT3nrC9nt1oVV4E2sNX5p/8O1 ODaCkGu5BE3A== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 May 2020 01:24:10 -0700 IronPort-SDR: NNJxPWS+DqM+FCsMiuGaQZ8W8lL1YjT5iOuO4yLf6uswWAzzx3MD5MKgfdmG31dUPWzC2NGOB3 hom/pb6Yw3kw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,406,1583222400"; d="scan'208";a="465496462" Received: from unknown (HELO localhost.localdomain.bj.intel.com) ([172.16.182.123]) by fmsmga005.fm.intel.com with ESMTP; 18 May 2020 01:24:09 -0700 From: Wei Zhao To: dev@dpdk.org Cc: stable@dpdk.org, xiaolong.ye@intel.com, jia.guo@intel.com, Wei Zhao Date: Mon, 18 May 2020 16:00:51 +0800 Message-Id: <20200518080051.36318-1-wei.zhao1@intel.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20200518074330.35840-1-wei.zhao1@intel.com> References: <20200518074330.35840-1-wei.zhao1@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [dpdk-stable] [PATCH v5] net/i40e: fix the core dump risk of wild pointer operation X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org Sender: "stable" In i40e PMD code of function i40e_res_pool_free(), if valid_entry is freed by "rte_free(valid_entry);" in the code, then the following code for pool update may still use the wild pointer "valid_entry" for pool info update. It seems has the risk of core dump for using wild pointer operation, we should avoid this risk. Cc: stable@dpdk.org Fixes: 4861cde46116 ("i40e: new poll mode driver") Signed-off-by: Wei Zhao --- v2: update commit log v3: set free pointer to NULL v4: change code style v5: fix an issue in v4 --- drivers/net/i40e/i40e_ethdev.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c index 749d85f54..00bb05179 100644 --- a/drivers/net/i40e/i40e_ethdev.c +++ b/drivers/net/i40e/i40e_ethdev.c @@ -4935,6 +4935,7 @@ i40e_res_pool_free(struct i40e_res_pool_info *pool, { struct pool_entry *entry, *next, *prev, *valid_entry = NULL; uint32_t pool_offset; + uint16_t len; int insert; if (pool == NULL) { @@ -4973,12 +4974,13 @@ i40e_res_pool_free(struct i40e_res_pool_info *pool, } insert = 0; + len = valid_entry->len; /* Try to merge with next one*/ if (next != NULL) { /* Merge with next one */ - if (valid_entry->base + valid_entry->len == next->base) { + if (valid_entry->base + len == next->base) { next->base = valid_entry->base; - next->len += valid_entry->len; + next->len += len; rte_free(valid_entry); valid_entry = next; insert = 1; @@ -4988,13 +4990,15 @@ i40e_res_pool_free(struct i40e_res_pool_info *pool, if (prev != NULL) { /* Merge with previous one */ if (prev->base + prev->len == valid_entry->base) { - prev->len += valid_entry->len; + prev->len += len; /* If it merge with next one, remove next node */ if (insert == 1) { LIST_REMOVE(valid_entry, next); rte_free(valid_entry); + valid_entry = NULL; } else { rte_free(valid_entry); + valid_entry = NULL; insert = 1; } } @@ -5010,8 +5014,8 @@ i40e_res_pool_free(struct i40e_res_pool_info *pool, LIST_INSERT_HEAD(&pool->free_list, valid_entry, next); } - pool->num_free += valid_entry->len; - pool->num_alloc -= valid_entry->len; + pool->num_free += len; + pool->num_alloc -= len; return 0; } -- 2.19.1