From nobody Fri Jun 12 15:41:56 2026 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6B1F731960A for ; Thu, 14 May 2026 03:24:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.4 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778729062; cv=none; b=Pte0Mo6jy2ybnMcdxrJDklsZElPtboD97MR5YVREIzh/4h1XdHtUZekPuL5A+Q29/JXxw9l4pT/whf/Pb+42reIdH8tcKH9q8sYDpilo7RL/NFygImLf917ZuuD7yb7VDiyLTCo6hHfkL6BiwLlixQwu+HNLmuTSqvu2x8cl9xs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778729062; c=relaxed/simple; bh=If80DWaQvVCD5aNgjC9biCYXAedxp09iig4LOt8Qhh0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=DhspN6apgRmBP2Nc/7l/28fdObnT1iWQ2IymXvZSIRQ+4jo1q3ct8xTk6YErdlOxOyccWO7zU75ov/XIYMxzneE1RbBDTdOlWJ9hPF8dY3aqaUDGmL9ie0ULUTvveAZckZOnHdgrNTQPlI6aLoFYPMi3LiszboiwHTDtXPCPl4k= 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=O2GvS9xv; arc=none smtp.client-ip=220.197.31.4 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="O2GvS9xv" 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=GV 9clvuyPkthNY9ct+wRWBAAYfXBWNB1V77YD8eBwdQ=; b=O2GvS9xvkUN39QzrIU ANW5aPrZOY7zrdH0JYwVhI5HxxCKz4RGGUMhwaDydOC/u5yXTHVc2oE8KRevjGcd ssUC34KcbwR43qctHbIrgI6ysvP68h51Tbb1flszfQRRKUdm0v+PMTRwEhjNUEEy UwiA903xXJ62TPCR3SO3NXbCc= Received: from neo-TianYi510Pro-15ICK.. (unknown []) by gzsmtp2 (Coremail) with SMTP id PSgvCgDHz0FDQAVq7k7lEQ--.44394S2; Thu, 14 May 2026 11:23:48 +0800 (CST) From: liuqiangneo@163.com To: jgg@ziepe.ca, leon@kernel.org Cc: akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Qiang Liu Subject: [PATCH] lib/test_hmm: Check alloc_page_vma() return value Date: Thu, 14 May 2026 11:23:44 +0800 Message-ID: <20260514032345.32256-1-liuqiangneo@163.com> X-Mailer: git-send-email 2.43.0 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: PSgvCgDHz0FDQAVq7k7lEQ--.44394S2 X-Coremail-Antispam: 1Uf129KBjvdXoWrtw17XrWDJFW3tw48uw48WFg_yoW3twb_ur 47Aan0ga45JFn8Gr4Fyws7Jr4Fy3s7ua1xuFnYqrW3ua4jqrs0gw1DJrsxJas8Gr4j9FW7 Cr4qyr13A3sayjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7IU189NDUUUUU== X-CM-SenderInfo: 5olx1xxdqj0vrr6rljoofrz/xtbC-AT8XmoFQET25wAA3g Content-Type: text/plain; charset="utf-8" From: Qiang Liu Return VM_FAULT_OOM if page allocation fails, which avoids a NULL pointer dereference when calling lock_page(). Signed-off-by: Qiang Liu --- lib/test_hmm.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/test_hmm.c b/lib/test_hmm.c index 213504915737..f8b43d6eb261 100644 --- a/lib/test_hmm.c +++ b/lib/test_hmm.c @@ -1063,6 +1063,8 @@ static vm_fault_t dmirror_devmem_fault_alloc_and_copy= (struct migrate_vma *args, /* Try with smaller pages if large allocation fails */ if (!dpage && order) { dpage =3D alloc_page_vma(GFP_HIGHUSER_MOVABLE, args->vma, addr); + if (!dpage) + return VM_FAULT_OOM; lock_page(dpage); dst[i] =3D migrate_pfn(page_to_pfn(dpage)); dst_page =3D pfn_to_page(page_to_pfn(dpage)); --=20 2.43.0