linux-kernel - [PATCH] drm/plane: Move range check for format

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Message-Id: <20211203102815.38624-1-steven.price@arm.com>
Date:   Fri,  3 Dec 2021 10:28:15 +0000
From:   Steven Price <steven.price@....com>
To:     Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>
Cc:     Steven Price <steven.price@....com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Liviu Dudau <liviu.dudau@....com>
Subject: [PATCH] drm/plane: Move range check for format_count earlier

While the check for format_count > 64 in __drm_universal_plane_init()
shouldn't be hit (it's a WARN_ON), in its current position it will then
leak the plane->format_types array and fail to call
drm_mode_object_unregister() leaking the modeset identifier. Move it to
the start of the function to avoid allocating those resources in the
first place.

Signed-off-by: Steven Price <steven.price@....com>
---
 drivers/gpu/drm/drm_plane.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 82afb854141b..fd0bf90fb4c2 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -249,6 +249,13 @@ static int __drm_universal_plane_init(struct drm_device *dev,
 	if (WARN_ON(config->num_total_plane >= 32))
 		return -EINVAL;
 
+	/*
+	 * First driver to need more than 64 formats needs to fix this. Each
+	 * format is encoded as a bit and the current code only supports a u64.
+	 */
+	if (WARN_ON(format_count > 64))
+		return -EINVAL;
+
 	WARN_ON(drm_drv_uses_atomic_modeset(dev) &&
 		(!funcs->atomic_destroy_state ||
 		 !funcs->atomic_duplicate_state));
@@ -270,13 +277,6 @@ static int __drm_universal_plane_init(struct drm_device *dev,
 		return -ENOMEM;
 	}
 
-	/*
-	 * First driver to need more than 64 formats needs to fix this. Each
-	 * format is encoded as a bit and the current code only supports a u64.
-	 */
-	if (WARN_ON(format_count > 64))
-		return -EINVAL;
-
 	if (format_modifiers) {
 		const uint64_t *temp_modifiers = format_modifiers;
 
-- 
2.25.1