linux-kernel - [PATCH 2/3] drm/vc4: crtc: use drm managed resources

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Message-Id: <20220713085500.1970589-3-dakr@redhat.com>
Date:   Wed, 13 Jul 2022 10:54:59 +0200
From:   Danilo Krummrich <dakr@...hat.com>
To:     emma@...olt.net, mripard@...nel.org, daniel@...ll.ch,
        airlied@...ux.ie
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Danilo Krummrich <dakr@...hat.com>
Subject: [PATCH 2/3] drm/vc4: crtc: use drm managed resources

Allocate the crtc objects with drmm_kzalloc() in order to tie the release
action to the underlying struct drm_device, where all the userspace
visible stuff is attached to, rather than to struct device.

This can prevent potential use-after free issues on driver unload or
EPROBE_DEFERRED backoff.

Signed-off-by: Danilo Krummrich <dakr@...hat.com>
---
 drivers/gpu/drm/vc4/vc4_crtc.c | 2 +-
 drivers/gpu/drm/vc4/vc4_txp.c  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index 9355213dc883..4b0c61cc3265 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -1273,7 +1273,7 @@ static int vc4_crtc_bind(struct device *dev, struct device *master, void *data)
 	struct drm_plane *destroy_plane, *temp;
 	int ret;
 
-	vc4_crtc = devm_kzalloc(dev, sizeof(*vc4_crtc), GFP_KERNEL);
+	vc4_crtc = drmm_kzalloc(drm, sizeof(*vc4_crtc), GFP_KERNEL);
 	if (!vc4_crtc)
 		return -ENOMEM;
 	crtc = &vc4_crtc->base;
diff --git a/drivers/gpu/drm/vc4/vc4_txp.c b/drivers/gpu/drm/vc4/vc4_txp.c
index 3579d487402e..ae2193fe3b29 100644
--- a/drivers/gpu/drm/vc4/vc4_txp.c
+++ b/drivers/gpu/drm/vc4/vc4_txp.c
@@ -479,7 +479,7 @@ static int vc4_txp_bind(struct device *dev, struct device *master, void *data)
 	if (irq < 0)
 		return irq;
 
-	txp = devm_kzalloc(dev, sizeof(*txp), GFP_KERNEL);
+	txp = drmm_kzalloc(drm, sizeof(*txp), GFP_KERNEL);
 	if (!txp)
 		return -ENOMEM;
 	vc4_crtc = &txp->base;
-- 
2.36.1