linux-kernel - [PATCH 5.9 223/757] drm/crc-debugfs: Fix memleak in crc_control

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Message-Id: <20201027135501.075797390@linuxfoundation.org>
Date:   Tue, 27 Oct 2020 14:47:53 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dinghao Liu <dinghao.liu@....edu.cn>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.9 223/757] drm/crc-debugfs: Fix memleak in crc_control_write

From: Dinghao Liu <dinghao.liu@....edu.cn>

[ Upstream commit f7ec68b341dbd5da13d4c65ce444dcd605f1c42e ]

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

Fixes: d5cc15a0c66e ("drm: crc: Introduce verify_crc_source callback")
Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
[danvet: change Fixes: tag per Laurent's review]
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200819082228.26847-1-dinghao.liu@zju.edu.cn
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 5d67a41f7c3a8..3dd70d813f694 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);
 
-- 
2.25.1