Commit f27fbff8 authored Oct 13, 2021 by Dan Carpenter Committed by Greg Kroah-Hartman Nov 17, 2021

drm/msm: uninitialized variable in msm_gem_import()



[ 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: 05b84911 ("drm/msm: prime support")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20211013081315.GG6010@kili


Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent 32ac072c

drivers/gpu/drm/msm/msm_gem.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -1036,7 +1036,7 @@ static struct drm_gem_object _msm_gem_new(struct drm_device dev,

		ret = msm_gem_new_impl(dev, size, flags, &obj);
		if (ret)
		goto fail;
		return ERR_PTR(ret);

		msm_obj = to_msm_bo(obj);

		@@ -1124,7 +1124,7 @@ struct drm_gem_object msm_gem_import(struct drm_device dev,

		ret = msm_gem_new_impl(dev, size, MSM_BO_WC, &obj);
		if (ret)
		goto fail;
		return ERR_PTR(ret);

		drm_gem_private_object_init(dev, obj, size);