From patchwork Sat Apr 25 07:19:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shengjiu Wang X-Patchwork-Id: 192891 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=-9.7 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 540BEC55185 for ; Sat, 25 Apr 2020 07:29:24 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D01372071C for ; Sat, 25 Apr 2020 07:29:23 +0000 (UTC) Authentication-Results: mail.kernel.org; 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Sat, 25 Apr 2020 09:28:30 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id C1EF8F801EC; Sat, 25 Apr 2020 09:28:22 +0200 (CEST) Received: from inva020.nxp.com (inva020.nxp.com [92.121.34.13]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 475D7F800BE for ; Sat, 25 Apr 2020 09:28:13 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 475D7F800BE Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id A6E9C1A06DF; Sat, 25 Apr 2020 09:28:10 +0200 (CEST) Received: from invc005.ap-rdc01.nxp.com (invc005.ap-rdc01.nxp.com [165.114.16.14]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 23C031A06D6; Sat, 25 Apr 2020 09:28:06 +0200 (CEST) Received: from localhost.localdomain (shlinux2.ap.freescale.net [10.192.224.44]) by invc005.ap-rdc01.nxp.com (Postfix) with ESMTP id 43266402D5; Sat, 25 Apr 2020 15:28:00 +0800 (SGT) From: Shengjiu Wang To: timur@kernel.org, nicoleotsuka@gmail.com, Xiubo.Lee@gmail.com, festevam@gmail.com, broonie@kernel.org, alsa-devel@alsa-project.org, lgirdwood@gmail.com, perex@perex.cz, tiwai@suse.com Subject: [PATCH v2] ASoC: fsl_easrc: Check for null pointer before dereferencing "ctx" in fsl_easrc_hw_free() Date: Sat, 25 Apr 2020 15:19:29 +0800 Message-Id: X-Mailer: git-send-email 2.7.4 X-Virus-Scanned: ClamAV using ClamSMTP Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" The patch 955ac624058f: "ASoC: fsl_easrc: Add EASRC ASoC CPU DAI drivers" from Apr 16, 2020, leads to the following Smatch complaint: sound/soc/fsl/fsl_easrc.c:1529 fsl_easrc_hw_free() warn: variable dereferenced before check 'ctx' (see line 1527) sound/soc/fsl/fsl_easrc.c 1526 struct fsl_asrc_pair *ctx = runtime->private_data; 1527 struct fsl_easrc_ctx_priv *ctx_priv = ctx->private; ^^^^^ Dereference 1528 1529 if (ctx && (ctx_priv->ctx_streams & BIT(substream->stream))) { ^^^ This check is too late, to prevent a NULL dereference. 1530 ctx_priv->ctx_streams &= ~BIT(substream->stream); 1531 fsl_easrc_release_context(ctx); Fixes: 955ac624058f ("ASoC: fsl_easrc: Add EASRC ASoC CPU DAI drivers") Reported-by: Dan Carpenter Signed-off-by: Shengjiu Wang --- sound/soc/fsl/fsl_easrc.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/sound/soc/fsl/fsl_easrc.c b/sound/soc/fsl/fsl_easrc.c index 97658e1f4989..20326bffab64 100644 --- a/sound/soc/fsl/fsl_easrc.c +++ b/sound/soc/fsl/fsl_easrc.c @@ -1524,9 +1524,14 @@ static int fsl_easrc_hw_free(struct snd_pcm_substream *substream, { struct snd_pcm_runtime *runtime = substream->runtime; struct fsl_asrc_pair *ctx = runtime->private_data; - struct fsl_easrc_ctx_priv *ctx_priv = ctx->private; + struct fsl_easrc_ctx_priv *ctx_priv; - if (ctx && (ctx_priv->ctx_streams & BIT(substream->stream))) { + if (!ctx) + return -EINVAL; + + ctx_priv = ctx->private; + + if (ctx_priv->ctx_streams & BIT(substream->stream)) { ctx_priv->ctx_streams &= ~BIT(substream->stream); fsl_easrc_release_context(ctx); }