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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Rob Clark <robdclark@chromium.org>,
	Sasha Levin <sashal@kernel.org>,
	linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org,
	freedreno@lists.freedesktop.org
Subject: [PATCH AUTOSEL 4.14 230/371] drm/msm/mdp5: Fix mdp5_cfg_init error return
Date: Thu, 16 Jan 2020 12:21:42 -0500
Message-ID: <20200116172403.18149-173-sashal@kernel.org> (raw)
In-Reply-To: <20200116172403.18149-1-sashal@kernel.org>

From: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>

[ Upstream commit fc19cbb785d7bbd1a1af26229b5240a3ab332744 ]

If mdp5_cfg_init fails because of an unknown major version, a null pointer
dereference occurs.  This is because the caller of init expects error
pointers, but init returns NULL on error.  Fix this by returning the
expected values on error.

Fixes: 2e362e1772b8 (drm/msm/mdp5: introduce mdp5_cfg module)
Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/msm/mdp/mdp5/mdp5_cfg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_cfg.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_cfg.c
index 824067d2d427..42f0ecb0cf35 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_cfg.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_cfg.c
@@ -635,7 +635,7 @@ struct mdp5_cfg_handler *mdp5_cfg_init(struct mdp5_kms *mdp5_kms,
 	if (cfg_handler)
 		mdp5_cfg_destroy(cfg_handler);
 
-	return NULL;
+	return ERR_PTR(ret);
 }
 
 static struct mdp5_cfg_platform *mdp5_get_config(struct platform_device *dev)
-- 
2.20.1


       reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200116172403.18149-1-sashal@kernel.org>
2020-01-16 17:21 ` Sasha Levin [this message]
2020-01-16 17:21 ` [PATCH AUTOSEL 4.14 236/371] drm/msm/a3xx: remove TPL1 regs from snapshot Sasha Levin
2020-01-16 17:21 ` [PATCH AUTOSEL 4.14 239/371] clk: qcom: Fix -Wunused-const-variable Sasha Levin
2020-01-16 17:23 ` [PATCH AUTOSEL 4.14 322/371] drm/msm/dsi: Implement reset correctly Sasha Levin
2020-01-16 17:23 ` [PATCH AUTOSEL 4.14 336/371] arm64: dts: apq8096-db820c: Increase load on l21 for SDCARD Sasha Levin

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