From patchwork Wed Nov 2 11:01:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luca Ceresoli X-Patchwork-Id: 87066 X-Patchwork-Delegate: hverkuil@xs4all.nl Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1oqBVv-007byE-VN; Wed, 02 Nov 2022 11:02:32 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230273AbiKBLCY (ORCPT + 1 other); Wed, 2 Nov 2022 07:02:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46470 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230089AbiKBLCW (ORCPT ); Wed, 2 Nov 2022 07:02:22 -0400 Received: from relay9-d.mail.gandi.net (relay9-d.mail.gandi.net [217.70.183.199]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 96742222B0; Wed, 2 Nov 2022 04:02:20 -0700 (PDT) Received: from booty.fritz.box (unknown [77.244.183.192]) (Authenticated sender: luca.ceresoli@bootlin.com) by mail.gandi.net (Postfix) with ESMTPA id 21E19FF81A; Wed, 2 Nov 2022 11:02:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1667386936; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=AIWP8hCG3H8802+ZOuJvt5Vl5+0UlGU9wyMe8L68JX0=; b=il6dEg4V1FoLPtn1gLJiTHTPHNENeF9bzb58WJ1zQuz2JTaOA2NIyarOSIrsc3xmXKiCiL Nn1Nn+uwyVC39P7pdBs+56MGUX9ac6tCHwu8QqQQI4vVQ/Cf913yJa28Ve4/J2/8zwSZll xOvQ9/HGzov3hy0WiEwVwTuvgEXKknj1OXO7fDh0+yiyfSWG52xp452qr2s5kCP40MIYpG W/6GNcYmsCaih1/I3yBfG/VnxWgnNrKAm3zUn3/6cSJVgxSh518GIQSU6NSP9guwDSlwZt +8NRQ2dA+nN/hz7oMOZn9HDB0vwiHSvMyYfb4rqltdrpk9ozXIAwKsdHb5wqfA== From: luca.ceresoli@bootlin.com To: Thierry Reding , Jonathan Hunter , Sowjanya Komatineni , Mauro Carvalho Chehab , Greg Kroah-Hartman , Hans Verkuil , Dmitry Osipenko Cc: Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-tegra@vger.kernel.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org, Luca Ceresoli , stable@vger.kernel.org, Dan Carpenter Subject: [PATCH v2 1/2] staging: media: tegra-video: fix chan->mipi value on error Date: Wed, 2 Nov 2022 12:01:01 +0100 Message-Id: <20221102110102.25050-1-luca.ceresoli@bootlin.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Spam-Status: No, score=-2.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.5 (--) X-LSpam-Report: No, score=-2.5 required=5.0 tests=BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no From: Luca Ceresoli chan->mipi takes the return value of tegra_mipi_request() which can be a valid pointer or an error. However chan->mipi is checked in several places, including error-cleanup code in tegra_csi_channels_cleanup(), as 'if (chan->mipi)', which suggests the initial intent was that chan->mipi should be either NULL or a valid pointer, never an error. As a consequence, cleanup code in case of tegra_mipi_request() errors would dereference an invalid pointer. Fix by ensuring chan->mipi always contains either NULL or a void pointer. Also add that to the documentation. Fixes: 523c857e34ce ("media: tegra-video: Add CSI MIPI pads calibration") Cc: stable@vger.kernel.org Reported-by: Dan Carpenter Signed-off-by: Luca Ceresoli --- This patch was added in v2. --- drivers/staging/media/tegra-video/csi.c | 1 + drivers/staging/media/tegra-video/csi.h | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/staging/media/tegra-video/csi.c b/drivers/staging/media/tegra-video/csi.c index b26e44adb2be..6b59ef55c525 100644 --- a/drivers/staging/media/tegra-video/csi.c +++ b/drivers/staging/media/tegra-video/csi.c @@ -448,6 +448,7 @@ static int tegra_csi_channel_alloc(struct tegra_csi *csi, chan->mipi = tegra_mipi_request(csi->dev, node); if (IS_ERR(chan->mipi)) { ret = PTR_ERR(chan->mipi); + chan->mipi = NULL; dev_err(csi->dev, "failed to get mipi device: %d\n", ret); } diff --git a/drivers/staging/media/tegra-video/csi.h b/drivers/staging/media/tegra-video/csi.h index 4ee05a1785cf..6960ea2e3d36 100644 --- a/drivers/staging/media/tegra-video/csi.h +++ b/drivers/staging/media/tegra-video/csi.h @@ -56,7 +56,7 @@ struct tegra_csi; * @framerate: active framerate for TPG * @h_blank: horizontal blanking for TPG active format * @v_blank: vertical blanking for TPG active format - * @mipi: mipi device for corresponding csi channel pads + * @mipi: mipi device for corresponding csi channel pads, or NULL if not applicable (TPG, error) * @pixel_rate: active pixel rate from the sensor on this channel */ struct tegra_csi_channel {