linux-kernel - [PATCH] drm: msm: fix possible memory leak in mdp5_crtc_cursor

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Message-Id: <20220509061125.18585-1-hbh25y@gmail.com>
Date:   Mon,  9 May 2022 14:11:25 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     robdclark@...il.com, sean@...rly.run, quic_abhinavk@...cinc.com,
        airlied@...ux.ie, daniel@...ll.ch, dmitry.baryshkov@...aro.org,
        gbeeresh@...eaurora.org, sviau@...eaurora.org,
        wentaox@...eaurora.org
Cc:     linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH] drm: msm: fix possible memory leak in mdp5_crtc_cursor_set()

drm_gem_object_lookup will call drm_gem_object_get inside. So cursor_bo
needs to be put when msm_gem_get_and_pin_iova fails.

Fixes: e172d10a9c4a ("drm/msm/mdp5: Add hardware cursor support")
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
---
 drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
index b966cd69f99d..6a5f73f6a23b 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
@@ -991,8 +991,10 @@ static int mdp5_crtc_cursor_set(struct drm_crtc *crtc,
 
 	ret = msm_gem_get_and_pin_iova(cursor_bo, kms->aspace,
 			&mdp5_crtc->cursor.iova);
-	if (ret)
+	if (ret) {
+		drm_gem_object_put(cursor_bo);
 		return -EINVAL;
+	}
 
 	pm_runtime_get_sync(&pdev->dev);
 
-- 
2.25.1