linux-kernel - [PATCH AUTOSEL 6.6 2/6] drm/qxl: prevent memory leak

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Message-ID: <20231115033350.1228588-2-sashal@kernel.org>
Date:   Tue, 14 Nov 2023 22:33:36 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Zongmin Zhou <zhouzongmin@...inos.cn>,
        Dave Airlie <airlied@...hat.com>,
        Maxime Ripard <mripard@...nel.org>,
        Sasha Levin <sashal@...nel.org>, kraxel@...hat.com,
        maarten.lankhorst@...ux.intel.com, tzimmermann@...e.de,
        airlied@...il.com, daniel@...ll.ch, virtualization@...ts.linux.dev,
        spice-devel@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.6 2/6] drm/qxl: prevent memory leak

From: Zongmin Zhou <zhouzongmin@...inos.cn>

[ Upstream commit 0e8b9f258baed25f1c5672613699247c76b007b5 ]

The allocated memory for qdev->dumb_heads should be released
in qxl_destroy_monitors_object before qxl suspend.
otherwise,qxl_create_monitors_object will be called to
reallocate memory for qdev->dumb_heads after qxl resume,
it will cause memory leak.

Signed-off-by: Zongmin Zhou <zhouzongmin@...inos.cn>
Link: https://lore.kernel.org/r/20230801025309.4049813-1-zhouzongmin@kylinos.cn
Reviewed-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Maxime Ripard <mripard@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/qxl/qxl_display.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index 6492a70e3c396..404b0483bb7cb 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -1229,6 +1229,9 @@ int qxl_destroy_monitors_object(struct qxl_device *qdev)
 	if (!qdev->monitors_config_bo)
 		return 0;
 
+	kfree(qdev->dumb_heads);
+	qdev->dumb_heads = NULL;
+
 	qdev->monitors_config = NULL;
 	qdev->ram_header->monitors_config = 0;
 
-- 
2.42.0