From nobody Tue Feb 10 03:19:54 2026 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.3]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 0DAE9233D88; Thu, 3 Jul 2025 10:09:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.3 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751537363; cv=none; b=eIwBHNMNzYY7rXB8t1lTAsS/ob+9c7/4IkOzzDSYXN07t8WoO31sQlFWOFK+7N+969KvCZoKglYLIypPs9siIAKO+4JUp2r6TuGM7X+hvAplDILu3QNmWBrrTrXj7ccMUTOsQBOb7adOWLMrnEoxKj07d9Eqye51LVAVPS9H14Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751537363; c=relaxed/simple; bh=8oFnaDx8yWVXgMM76SE9vU05ZBgM/KqyVMU9quvFQu8=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=RvsaJCAck3OZw4DG3O29pHfzZC9u+hTQwH5eRW8Uuu+qM/Wj3xZCkK/74bM2+RPPGxzsMAuQDiIRmrK35tR2RISJcFjYOeN0ujQofXaQGLFZSeGngcRNpCXmD4/MQm0bbYqkhVt8ar5m48HhH/q9qb7VTXaZH6+/RgNgHXWvn4A= 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=YtOtvu6f; arc=none smtp.client-ip=220.197.31.3 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="YtOtvu6f" 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=YtOtvu6f1su/Vp0mcq AWl9cuBDquXN85rS/vpg7sVG5BDVuuEurnYJ2LQnqxfi+zual8OrKmXKZhGTfgWR kX0oSdAJvvNYNmcNqoGMaSgA7QVdAJv30Sxa3316Dkd9vaTuUf7nNIdTpvkVrgUN kkYht8ULbfrF9iFhfxQmVT8BQ= Received: from icess-ProLiant-DL380-Gen10.. (unknown []) by gzga-smtp-mtada-g1-4 (Coremail) with SMTP id _____wBn3nOKVmZobwkoCQ--.29235S4; Thu, 03 Jul 2025 18:08:12 +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 RESEND] x86/pmem: Fix a null pointer dereference in register_e820_pmem() Date: Thu, 3 Jul 2025 18:08:09 +0800 Message-Id: <20250703100809.2542430-1-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: _____wBn3nOKVmZobwkoCQ--.29235S4 X-Coremail-Antispam: 1Uf129KBjvdXoWruw48urWkAr1Dur1DWrWkXrb_yoW3Awb_Kr 17K3yDurWFvr929F13Aw4fZr1fJwn7tFWF9r1UKFnavr90gr45X3yjqFWFyr43XrZ7KrWU XasxCrZxGFy7CjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7sRG0PfUUUUUU== X-CM-SenderInfo: xkdr5xpdqjszblsqjki6rwjhhfrp/xtbBkAl-bmhmVB1MfQAAs+ 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