linux-kernel - [PATCH 4.19 151/323] drm/msm: uninitialized variable in msm_gem

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Date:   Wed, 24 Nov 2021 12:55:41 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Rob Clark <robdclark@...omium.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 151/323] drm/msm: uninitialized variable in msm_gem_import()

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 2203bd0e5c12ffc53ffdd4fbd7b12d6ba27e0424 ]

The msm_gem_new_impl() function cleans up after itself so there is no
need to call drm_gem_object_put().  Conceptually, it does not make sense
to call a kref_put() function until after the reference counting has
been initialized which happens immediately after this call in the
drm_gem_(private_)object_init() functions.

In the msm_gem_import() function the "obj" pointer is uninitialized, so
it will lead to a crash.

Fixes: 05b849111c07 ("drm/msm: prime support")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Link: https://lore.kernel.org/r/20211013081315.GG6010@kili
Signed-off-by: Rob Clark <robdclark@...omium.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/msm/msm_gem.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 7c0b30c955c39..c551d84444976 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -965,7 +965,7 @@ static struct drm_gem_object *_msm_gem_new(struct drm_device *dev,
 
 	ret = msm_gem_new_impl(dev, size, flags, NULL, &obj, struct_mutex_locked);
 	if (ret)
-		goto fail;
+		return ERR_PTR(ret);
 
 	if (use_vram) {
 		struct msm_gem_vma *vma;
@@ -1035,7 +1035,7 @@ struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 
 	ret = msm_gem_new_impl(dev, size, MSM_BO_WC, dmabuf->resv, &obj, false);
 	if (ret)
-		goto fail;
+		return ERR_PTR(ret);
 
 	drm_gem_private_object_init(dev, obj, size);
 
-- 
2.33.0