From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=192.55.52.115; helo=mga14.intel.com; envelope-from=hao.a.wu@intel.com; receiver=edk2-devel@lists.01.org Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id BDBE1210C4DD1 for ; Sun, 29 Jul 2018 22:37:14 -0700 (PDT) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 29 Jul 2018 22:37:14 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,421,1526367600"; d="scan'208";a="60846929" Received: from shwdeopenpsi014.ccr.corp.intel.com ([10.239.9.19]) by orsmga008.jf.intel.com with ESMTP; 29 Jul 2018 22:37:13 -0700 From: Hao Wu To: edk2-devel@lists.01.org Cc: Hao Wu , Jiewen Yao Date: Mon, 30 Jul 2018 13:37:08 +0800 Message-Id: <20180730053709.5128-2-hao.a.wu@intel.com> X-Mailer: git-send-email 2.12.0.windows.1 In-Reply-To: <20180730053709.5128-1-hao.a.wu@intel.com> References: <20180730053709.5128-1-hao.a.wu@intel.com> Subject: [PATCH 1/2] MdePkg/SmmMemLib: Avoid possible NULL ptr dereference X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Jul 2018 05:37:14 -0000 Within function SmmMemLibInternalGetUefiMemoryAttributesTable(), add a check to avoid possible null pointer dereference. Cc: Jiewen Yao Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Hao Wu --- MdePkg/Library/SmmMemLib/SmmMemLib.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/MdePkg/Library/SmmMemLib/SmmMemLib.c b/MdePkg/Library/SmmMemLib/SmmMemLib.c index 3409ddf87c..3e458417de 100644 --- a/MdePkg/Library/SmmMemLib/SmmMemLib.c +++ b/MdePkg/Library/SmmMemLib/SmmMemLib.c @@ -439,7 +439,7 @@ SmmMemLibInternalGetUefiMemoryAttributesTable ( UINTN MemoryAttributesTableSize; Status = EfiGetSystemConfigurationTable (&gEfiMemoryAttributesTableGuid, (VOID **)&MemoryAttributesTable); - if (!EFI_ERROR (Status)) { + if (!(EFI_ERROR (Status) || (MemoryAttributesTable == NULL))) { MemoryAttributesTableSize = sizeof(EFI_MEMORY_ATTRIBUTES_TABLE) + MemoryAttributesTable->DescriptorSize * MemoryAttributesTable->NumberOfEntries; mSmmMemLibMemoryAttributesTable = AllocateCopyPool (MemoryAttributesTableSize, MemoryAttributesTable); ASSERT (mSmmMemLibMemoryAttributesTable != NULL); -- 2.12.0.windows.1