linux-kernel - [PATCH] omapfb: Fix reference count leak in display_init

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Message-Id: <20200528194424.11596-1-wu000273@umn.edu>
Date:   Thu, 28 May 2020 14:44:23 -0500
From:   wu000273@....edu
To:     kjlu@....edu
Cc:     wu000273@....edu,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Enrico Weigelt <info@...ux.net>,
        Allison Randal <allison@...utok.net>,
        Alexios Zavras <alexios.zavras@...el.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Rob Clark <robdclark@...il.com>,
        Dave Airlie <airlied@...il.com>, linux-omap@...r.kernel.org,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] omapfb: Fix reference count leak in display_init_sysfs.

From: Qiushi Wu <wu000273@....edu>

kobject_init_and_add() takes reference even when it fails.
If this function returns an error, kobject_put() must be called to
properly clean up the memory associated with the object.
Because function omap_dss_put_device() doesn't handle dssdev->kobj,
thus we need insert kobject_put() to clean up the kobject,
when kobject_init_and_add() fails.

Fixes: f76ee892a99e ("omapfb: copy omapdss & displays for omapfb")
Signed-off-by: Qiushi Wu <wu000273@....edu>
---
 drivers/video/fbdev/omap2/omapfb/dss/display-sysfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/video/fbdev/omap2/omapfb/dss/display-sysfs.c b/drivers/video/fbdev/omap2/omapfb/dss/display-sysfs.c
index 6dbe265b312d..51322ac7df07 100644
--- a/drivers/video/fbdev/omap2/omapfb/dss/display-sysfs.c
+++ b/drivers/video/fbdev/omap2/omapfb/dss/display-sysfs.c
@@ -316,6 +316,7 @@ int display_init_sysfs(struct platform_device *pdev)
 			&pdev->dev.kobj, "%s", dssdev->alias);
 		if (r) {
 			DSSERR("failed to create sysfs files\n");
+			kobject_put(&dssdev->kobj);
 			omap_dss_put_device(dssdev);
 			goto err;
 		}
-- 
2.17.1