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From:   Dinghao Liu <dinghao.liu@zju.edu.cn>
To:     dinghao.liu@zju.edu.cn, kjlu@umn.edu
Cc:     Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <mripard@kernel.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Leo Li <sunpeng.li@amd.com>,
        Mahesh Kumar <mahesh1.kumar@intel.com>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH] drm/crc-debugfs: Fix memleak in crc_control_write
Date:   Wed, 19 Aug 2020 16:22:28 +0800
Message-Id: <20200819082228.26847-1-dinghao.liu@zju.edu.cn>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

When verify_crc_source() fails, source needs to be freed.
However, current code is returning directly and ends up
leaking memory.

Fixes: c0811a7d5befe ("drm/crc: Cleanup crtc_crc_open function")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
---
 drivers/gpu/drm/drm_debugfs_crc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_debugfs_crc.c b/drivers/gpu/drm/drm_debugfs_crc.c
index 5d67a41f7c3a..3dd70d813f69 100644
--- a/drivers/gpu/drm/drm_debugfs_crc.c
+++ b/drivers/gpu/drm/drm_debugfs_crc.c
@@ -144,8 +144,10 @@ static ssize_t crc_control_write(struct file *file, const char __user *ubuf,
 		source[len - 1] = '\0';
 
 	ret = crtc->funcs->verify_crc_source(crtc, source, &values_cnt);
-	if (ret)
+	if (ret) {
+		kfree(source);
 		return ret;
+	}
 
 	spin_lock_irq(&crc->lock);
 
-- 
2.17.1