From nobody Fri Dec 19 17:47:44 2025 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.3]) by smtp.subspace.kernel.org (Postfix) with ESMTP id B072324B26; Mon, 26 May 2025 02:24:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.3 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748226301; cv=none; b=CNIir1bCljiATN7uBpY56Mg2BPVav93p0gkqMi6+daW45CUnQFJcb5gFP2Z6IoaU+h0uxrVKe59UREb9QI+ilauqLf5VS41fjZQZJnAVWi7k7xU51+71OrjNkBVS++RYlypABhz8ADqksjkweVigm8wNZfOoDAhvwsNqYX2M0Uk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748226301; c=relaxed/simple; bh=8oFnaDx8yWVXgMM76SE9vU05ZBgM/KqyVMU9quvFQu8=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=CzTwPZkGtf+7e4JWmtoJKSgh6gl8gytUb/viyoAoeZ3E96eiQPfP2WTbz6tESA6zyw1IOgopaaf9yyQAZi+3wjWlUwlahEYIwtV05nh56No7XmnUHuTQOUZ3iLMBdR+Ix/jaHVP2eGzFfRGKvFPSsmnlelQMxUeVGEVmtbjnIKE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=IWQRHBlF; arc=none smtp.client-ip=117.135.210.3 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="IWQRHBlF" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=We qACTZgfJCdNsvenNHl/KCtlQOAdLai2F3zW9rTuY4=; b=IWQRHBlFjkcYxj57iH uOdjLmFcSgibNF0j54QslfKu1lyUkDRHK2ud9XrqQNYp8s16EZ54zDcupUXQiDm/ 1xbJRdt3v4L6K/bU/5risITnj96Z7FgnM3rx11xT+K36HyRHVVHlLD9bhUi4WslW opvgPXvxeATs4z50q2z7X57bw= Received: from icess-ProLiant-DL380-Gen10.. (unknown []) by gzga-smtp-mtada-g0-0 (Coremail) with SMTP id _____wCH3tPA0DNoKCDCDw--.56100S4; Mon, 26 May 2025 10:24:02 +0800 (CST) From: Haoxiang Li To: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, haoxiang_li2024@163.com, dan.j.williams@intel.com Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH] x86/pmem: Fix a null pointer dereference in register_e820_pmem() Date: Mon, 26 May 2025 10:23:58 +0800 Message-Id: <20250526022358.3657209-1-haoxiang_li2024@163.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: _____wCH3tPA0DNoKCDCDw--.56100S4 X-Coremail-Antispam: 1Uf129KBjvdXoWruw48urWkAr1Dur1DWrWkXrb_yoW3Awb_Kr 17K3yDurWFvr929F13Aw4fZr1fJwn7tFWF9r1UKFnavr90gr45X3yjqFWFyr43XrZ7KrWU XasxCrZxGFy7CjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7sRNg4S7UUUUU== X-CM-SenderInfo: xkdr5xpdqjszblsqjki6rwjhhfrp/1tbiqAhZbmgzzXaLUQAAst Content-Type: text/plain; charset="utf-8" Add check for the return value of platform_device_alloc() to prevent null pointer dereference. Fixes: 7a67832c7e44 ("libnvdimm, e820: make CONFIG_X86_PMEM_LEGACY a trista= te option") Cc: stable@vger.kernel.org Signed-off-by: Haoxiang Li --- arch/x86/kernel/pmem.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kernel/pmem.c b/arch/x86/kernel/pmem.c index 23154d24b117..04fb221716ff 100644 --- a/arch/x86/kernel/pmem.c +++ b/arch/x86/kernel/pmem.c @@ -27,6 +27,8 @@ static __init int register_e820_pmem(void) * simply here to trigger the module to load on demand. */ pdev =3D platform_device_alloc("e820_pmem", -1); + if (!pdev) + return -ENOMEM; =20 rc =3D platform_device_add(pdev); if (rc) --=20 2.25.1