linux-kernel - [PATCH 03/11] media: exynos4-is: Fix nullptr when no CSIS device present

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <BN6PR04MB0660EE7304C2BB2E603A8824A3AE0@BN6PR04MB0660.namprd04.prod.outlook.com>
Date:   Sat, 25 Apr 2020 19:26:42 -0700
From:   Jonathan Bakker <xc-racer2@...e.ca>
To:     kyungmin.park@...sung.com, s.nawrocki@...sung.com,
        mchehab@...nel.org, kgene@...nel.org, krzk@...nel.org,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Jonathan Bakker <xc-racer2@...e.ca>
Subject: [PATCH 03/11] media: exynos4-is: Fix nullptr when no CSIS device present

Not all devices use the CSIS device, some may use the FIMC directly in
which case the CSIS device isn't registered.  This leads to a nullptr
exception when starting the stream as the CSIS device is always
referenced.  Instead, if getting the CSIS device fails, try getting the
FIMC directly to check if we are using the subdev API

Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca>
---
 drivers/media/platform/exynos4-is/media-dev.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/exynos4-is/media-dev.c b/drivers/media/platform/exynos4-is/media-dev.c
index 9aaf3b8060d5..5c32abc7251b 100644
--- a/drivers/media/platform/exynos4-is/media-dev.c
+++ b/drivers/media/platform/exynos4-is/media-dev.c
@@ -289,11 +289,26 @@ static int __fimc_pipeline_s_stream(struct exynos_media_pipeline *ep, bool on)
 		{ IDX_CSIS, IDX_FLITE, IDX_FIMC, IDX_SENSOR, IDX_IS_ISP },
 	};
 	struct fimc_pipeline *p = to_fimc_pipeline(ep);
-	struct fimc_md *fmd = entity_to_fimc_mdev(&p->subdevs[IDX_CSIS]->entity);
 	enum fimc_subdev_index sd_id;
 	int i, ret = 0;
 
 	if (p->subdevs[IDX_SENSOR] == NULL) {
+		struct fimc_md *fmd;
+		struct v4l2_subdev *sd = p->subdevs[IDX_CSIS];
+
+		if (!sd)
+			sd = p->subdevs[IDX_FIMC];
+
+		if (!sd) {
+			/*
+			 * If neither CSIS nor FIMC was set up,
+			 * it's impossible to have any sensors
+			 */
+			return -ENODEV;
+		}
+
+		fmd = entity_to_fimc_mdev(&sd->entity);
+
 		if (!fmd->user_subdev_api) {
 			/*
 			 * Sensor must be already discovered if we
-- 
2.20.1