linux-kernel - [PATCH] drm/fbdev: fix a memory leak on the dmt

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Message-Id: <20200617164405.232639-1-colin.king@canonical.com>
Date:   Wed, 17 Jun 2020 17:44:05 +0100
From:   Colin King <colin.king@...onical.com>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/fbdev: fix a memory leak on the dmt_mode object

From: Colin Ian King <colin.king@...onical.com>

Object drm_mode is allocated by the call to drm_mode_find_dmt
(via the call to drm_mode_duplicate and drm_mode_create). The
object is never free'd and hence causes a small memory leak.
Fix this by kfree'ing drm_mode once it is no longer required.

Addresses-Coverity: ("Resource leak")
Fixes: 1d42bbc8f7f9 ("drm/fbdev: fix cloning on fbcon")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/gpu/drm/drm_client_modeset.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/drm_client_modeset.c b/drivers/gpu/drm/drm_client_modeset.c
index b7e9e1c2564c..c0119e4db045 100644
--- a/drivers/gpu/drm/drm_client_modeset.c
+++ b/drivers/gpu/drm/drm_client_modeset.c
@@ -324,6 +324,8 @@ static bool drm_client_target_cloned(struct drm_device *dev,
 			can_clone = false;
 	}
 
+	kfree(dmt_mode);
+
 	if (can_clone) {
 		DRM_DEBUG_KMS("can clone using 1024x768\n");
 		return true;
-- 
2.27.0.rc0