linux-kernel - [PATCH 4.9 046/191] drm/msm/mdp5: Fix mdp5_init error path for failed mdp5

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Message-Id: <20200629154007.2495120-47-sashal@kernel.org>
Date:   Mon, 29 Jun 2020 11:37:42 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Roy Spliet <nouveau@...iet.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Rob Clark <robdclark@...omium.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 046/191] drm/msm/mdp5: Fix mdp5_init error path for failed mdp5_kms allocation

From: Roy Spliet <nouveau@...iet.org>

[ Upstream commit e4337877c5d578722c0716f131fb774522013cf5 ]

When allocation for mdp5_kms fails, calling mdp5_destroy() leads to undefined
behaviour, likely a nullptr exception or use-after-free troubles.

Signed-off-by: Roy Spliet <nouveau@...iet.org>
Reviewed-by: Abhinav Kumar <abhinavk@...eaurora.org>
Signed-off-by: Rob Clark <robdclark@...omium.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
index ed7143d35b25d..6224aca7cd297 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c
@@ -769,7 +769,8 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
 
 	return 0;
 fail:
-	mdp5_destroy(pdev);
+	if (mdp5_kms)
+		mdp5_destroy(pdev);
 	return ret;
 }
 
-- 
2.25.1