From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=91.218.175.57 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792994980; b=uLRHPr3Mde4iFjHsBopZ7q9zs4HSzZ4pbO4JUczDeQMOeaqgg+PsNfAUpSphkODlidFU pKP/eD+XKYWX60CuK0VADNeBkADAcvfuSor7+xisn+dugp7HCufz6ayKQ50FBmk5BIBAV i45o81V5dDh3fBvSVlZVjeHushMZqTl0glh9q/GTkiCnJPL5zjT4rW6XJi8yXiisasZ63 J13LO5Wf4ZdhHC+UXsg1fIkwLKFQhj59ua3GECAlTFeg3prm2g7tRUg2NR12qV8G2ihp+ FG9iUl79JTYmW3SBGwKn6CfnH3X237R/P4NR2JEa2RsUMKjECvA3xRHsZT6eaAmR8aA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792994980; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:From:Date:Subject:MIME-Version: Content-Type:Content-Transfer-Encoding:Message-Id:References: In-Reply-To:To:Cc:X-Mailer; bh=4YF1uuN8vSqlU2rOKHVGJs/CBUWobe7SwbzRynZeYYE=; b=2dmFvwFhM+x6+8jPoAptCIcgZH8lco7BSLxR5smx+IWVfSbdbRxYV/l9iM7xPVSJ34Ku zedWdZtH7TylB8xdgHFvHyVbFQsxbwoaj4iDIPD9SoWwPrcgwdPxm+T/D7Bw2kdzgiLoX rjrOxmOlNxYqOYKWMUgMiRgCWCQ3Tb0WOLTUqS4LJO1uLucQFH7IqGYaJMbLTKO7jkqSO wHMiD+kKJu43rKKZHCXvdI9ChPc8R+apKtbmWdWO/OWdqNyr7ZCzeKXY200U2qUx9wHJy rYMabGQlDLOCTTMCwvzYooJ8TDJp8CtQq4cuauVHZnyUxQSXE3MciXYD71CP38WaDUg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=TkiIF6yu; arc=none smtp.remote-ip=91.218.175.57 Received: from mta0.migadu.com (out-57.mta0.migadu.com [91.218.175.57]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 33EA8606A31A for ; Mon, 26 Oct 2026 06:09:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 33EA8606A31A Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=TkiIF6yu X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=+Gh148DE2VMFS8ATJDVgo5IPfM8B6qMQjDKrc8U6oj4=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1792994977; v=1; x=1793599777; b=TkiIF6yuVJtr6nAf2/USF/K15C9zdPNVY4ELLntSEfEjQ/t/ZS0GaN0fB/nfjQDDaTSJmQS4 VPLOK45yx5wMU7TfeCBV7ibNU3FrEBxcWLJfB2HOoQoL8Sz6mZF2+o9AdmEMadIGE9N5sYtOYqz URk7lT8s5lqCy9mPZI+S3uUQ= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 68994bf62ca272a5; Mon, 26 Oct 2026 06:09:37 +0000 X-Mizu-Trace-ID: 68994bf62ca272a5 X-Migadu-Flow: FLOW_OUT From: Ye Liu Date: Mon, 26 Oct 2026 14:09:24 +0800 Subject: [PATCH 2/2] mm/vmalloc: warn on NULL page in remap_vmalloc_range_partial X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261026-vmalloc_remap-v1-2-b7a907814e90@linux.dev> References: <20261026-vmalloc_remap-v1-0-b7a907814e90@linux.dev> In-Reply-To: <20261026-vmalloc_remap-v1-0-b7a907814e90@linux.dev> To: Andrew Morton , Uladzislau Rezki Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Ye Liu X-Mailer: b4 0.17-dev-39d60 From: Ye Liu remap_vmalloc_range_partial() oopses if vmalloc_to_page() returns NULL, which never happens today because VM_USERMAP areas keep every page mapped. Add a WARN_ON(!page) to flag a break before the oops. Signed-off-by: Ye Liu --- mm/vmalloc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index a888eca016a8..59ba203a4eff 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -4906,6 +4906,7 @@ int remap_vmalloc_range_partial(struct vm_area_struct *vma, unsigned long uaddr, struct page *page = vmalloc_to_page(kaddr); int ret; + WARN_ON(!page); ret = vm_insert_page(vma, uaddr, page); if (ret) return ret; -- 2.43.0