From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by dpdk.org (Postfix) with ESMTP id E01C15911; Thu, 31 May 2018 19:05:44 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 31 May 2018 10:05:42 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,463,1520924400"; d="scan'208";a="60710679" Received: from irvmail001.ir.intel.com ([163.33.26.43]) by orsmga001.jf.intel.com with ESMTP; 31 May 2018 10:05:41 -0700 Received: from sivswdev01.ir.intel.com (sivswdev01.ir.intel.com [10.237.217.45]) by irvmail001.ir.intel.com (8.14.3/8.13.6/MailSET/Hub) with ESMTP id w4VH5fNm013840; Thu, 31 May 2018 18:05:41 +0100 Received: from sivswdev01.ir.intel.com (localhost [127.0.0.1]) by sivswdev01.ir.intel.com with ESMTP id w4VH5erx028333; Thu, 31 May 2018 18:05:40 +0100 Received: (from aburakov@localhost) by sivswdev01.ir.intel.com with LOCAL id w4VH5ega028329; Thu, 31 May 2018 18:05:40 +0100 From: Anatoly Burakov To: dev@dpdk.org Cc: stable@dpdk.org Date: Thu, 31 May 2018 18:05:40 +0100 Message-Id: <9342b8f957343940a9a957a64853bd185db5b3c8.1527784022.git.anatoly.burakov@intel.com> X-Mailer: git-send-email 1.7.0.7 Subject: [dpdk-dev] [PATCH] malloc: fix pad erasing X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 31 May 2018 17:05:45 -0000 Previously, when joining adjacent free elements, we were erasing trailer and header, but did not erase the padding. Fix this by accounting for padding on erase, and do not erase padding twice by adjusting data pointer and data len to not include padding. Fixes: bb372060dad4 ("malloc: make heap a doubly-linked list") Cc: stable@dpdk.org Signed-off-by: Anatoly Burakov --- lib/librte_eal/common/malloc_elem.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/lib/librte_eal/common/malloc_elem.c b/lib/librte_eal/common/malloc_elem.c index 9bfe9b9b4..944587bc5 100644 --- a/lib/librte_eal/common/malloc_elem.c +++ b/lib/librte_eal/common/malloc_elem.c @@ -386,16 +386,18 @@ malloc_elem_join_adjacent_free(struct malloc_elem *elem) if (elem->next != NULL && elem->next->state == ELEM_FREE && next_elem_is_adjacent(elem)) { void *erase; + size_t erase_len; /* we will want to erase the trailer and header */ erase = RTE_PTR_SUB(elem->next, MALLOC_ELEM_TRAILER_LEN); + erase_len = MALLOC_ELEM_OVERHEAD + elem->next->pad; /* remove from free list, join to this one */ malloc_elem_free_list_remove(elem->next); join_elem(elem, elem->next); - /* erase header and trailer */ - memset(erase, 0, MALLOC_ELEM_OVERHEAD); + /* erase header, trailer and pad */ + memset(erase, 0, erase_len); } /* @@ -406,9 +408,11 @@ malloc_elem_join_adjacent_free(struct malloc_elem *elem) prev_elem_is_adjacent(elem)) { struct malloc_elem *new_elem; void *erase; + size_t erase_len; /* we will want to erase trailer and header */ erase = RTE_PTR_SUB(elem, MALLOC_ELEM_TRAILER_LEN); + erase_len = MALLOC_ELEM_OVERHEAD + elem->pad; /* remove from free list, join to this one */ malloc_elem_free_list_remove(elem->prev); @@ -416,8 +420,8 @@ malloc_elem_join_adjacent_free(struct malloc_elem *elem) new_elem = elem->prev; join_elem(new_elem, elem); - /* erase header and trailer */ - memset(erase, 0, MALLOC_ELEM_OVERHEAD); + /* erase header, trailer and pad */ + memset(erase, 0, erase_len); elem = new_elem; } @@ -436,8 +440,8 @@ malloc_elem_free(struct malloc_elem *elem) void *ptr; size_t data_len; - ptr = RTE_PTR_ADD(elem, sizeof(*elem)); - data_len = elem->size - MALLOC_ELEM_OVERHEAD; + ptr = RTE_PTR_ADD(elem, MALLOC_ELEM_HEADER_LEN + elem->pad); + data_len = elem->size - elem->pad - MALLOC_ELEM_OVERHEAD; elem = malloc_elem_join_adjacent_free(elem); -- 2.17.0