From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B8D39C64E6C for ; Mon, 19 Jul 2021 18:00:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9E1EB6113B for ; Mon, 19 Jul 2021 18:00:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377655AbhGSRQs (ORCPT ); Mon, 19 Jul 2021 13:16:48 -0400 Received: from mail.kernel.org ([198.145.29.99]:37992 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347837AbhGSPjh (ORCPT ); Mon, 19 Jul 2021 11:39:37 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 95C6861107; Mon, 19 Jul 2021 16:19:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626711567; bh=PFPsC1bwNfkre24GbZAloHDyURgIzkgS9yrhCz7qWhA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KJLyNsR3+JONBFF4kW108IApp7fhKKIBSgu+2/xNawBEvpbMremJvJl5I95lfZTIM tgSNQ7BxJmHWnp7Xsdkj3fKXS0G2M/OkZUMLniF5aeCx1RLXkt9DpYx60Kdv3E56CA Y21OUbmIwUcA9PNw+ygTi7EPoBqByMcbe2PytW0Y= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Takashi Iwai , Sasha Levin Subject: [PATCH 5.12 051/292] ALSA: usx2y: Dont call free_pages_exact() with NULL address Date: Mon, 19 Jul 2021 16:51:53 +0200 Message-Id: <20210719144944.195916262@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210719144942.514164272@linuxfoundation.org> References: <20210719144942.514164272@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Takashi Iwai [ Upstream commit cae0cf651adccee2c3f376e78f30fbd788d0829f ] Unlike some other functions, we can't pass NULL pointer to free_pages_exact(). Add a proper NULL check for avoiding possible Oops. Link: https://lore.kernel.org/r/20210517131545.27252-10-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/usb/usx2y/usb_stream.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/sound/usb/usx2y/usb_stream.c b/sound/usb/usx2y/usb_stream.c index 091c071b270a..cff684942c4f 100644 --- a/sound/usb/usx2y/usb_stream.c +++ b/sound/usb/usx2y/usb_stream.c @@ -142,8 +142,11 @@ void usb_stream_free(struct usb_stream_kernel *sk) if (!s) return; - free_pages_exact(sk->write_page, s->write_size); - sk->write_page = NULL; + if (sk->write_page) { + free_pages_exact(sk->write_page, s->write_size); + sk->write_page = NULL; + } + free_pages_exact(s, s->read_size); sk->s = NULL; } -- 2.30.2