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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B383C4332F for ; Tue, 7 Nov 2023 16:17:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235218AbjKGQRN (ORCPT ); Tue, 7 Nov 2023 11:17:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39884 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343530AbjKGQQv (ORCPT ); Tue, 7 Nov 2023 11:16:51 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 09EDF1BCA; Tue, 7 Nov 2023 07:52:17 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 61CD8C433C7; Tue, 7 Nov 2023 15:52:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699372337; bh=Hi4ahaJUaPkJz0w6M6TzWZNeU9v/cKUfV97yidC2350=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qsxcy4MGdGP4D+1sz0xIJbO4dAi12hl86q91Dj6eY+CrTKA/SVpL7l3VeJQo5zq04 Bs9JgOOtJRmq1XZPdjs01mDTbd6L5K/+ho8xJCoOyAyHi9rgM94n9+dVsCMEpDZlhb dDDNDpsIsTGGmvnanFKW/2FM5KW58sx0rdfom6LknsCVtxvjTY9YDLG8Y9lC2eanPQ 9RjNGC9uQmP+EHZXyZAyDj6IcqOx2Yi0GTIm15Mc15Pt3oOhik6lIXVmzKi5oGVOu2 CvHApCTm3V7dHid22wyeFQAF8ZwrFhu3y4Dj3K8lgnbIwX2ZEG2ycY431/y1RDNTwD zVLDEt4srHmcw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Cezary Rojewski , Takashi Iwai , Sasha Levin , perex@perex.cz, tiwai@suse.com, broonie@kernel.org, siyanteng@loongson.cn, zhangyiqun@phytium.com.cn, linux-sound@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 12/22] ALSA: hda: Fix possible null-ptr-deref when assigning a stream Date: Tue, 7 Nov 2023 10:51:21 -0500 Message-ID: <20231107155146.3767610-12-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231107155146.3767610-1-sashal@kernel.org> References: <20231107155146.3767610-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.137 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Cezary Rojewski [ Upstream commit f93dc90c2e8ed664985e366aa6459ac83cdab236 ] While AudioDSP drivers assign streams exclusively of HOST or LINK type, nothing blocks a user to attempt to assign a COUPLED stream. As supplied substream instance may be a stub, what is the case when code-loading, such scenario ends with null-ptr-deref. Signed-off-by: Cezary Rojewski Link: https://lore.kernel.org/r/20231006102857.749143-2-cezary.rojewski@intel.com Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/hda/hdac_stream.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c index eea22cf72aefd..ec95d0449bfe9 100644 --- a/sound/hda/hdac_stream.c +++ b/sound/hda/hdac_stream.c @@ -320,8 +320,10 @@ struct hdac_stream *snd_hdac_stream_assign(struct hdac_bus *bus, struct hdac_stream *res = NULL; /* make a non-zero unique key for the substream */ - int key = (substream->pcm->device << 16) | (substream->number << 2) | - (substream->stream + 1); + int key = (substream->number << 2) | (substream->stream + 1); + + if (substream->pcm) + key |= (substream->pcm->device << 16); spin_lock_irq(&bus->reg_lock); list_for_each_entry(azx_dev, &bus->stream_list, list) { -- 2.42.0