linux-kernel - [PATCH] gpu: drm: fix possible memory leak in drm_addmap

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Message-Id: <20220509054441.17282-1-hbh25y@gmail.com>
Date:   Mon,  9 May 2022 13:44:41 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...ux.ie, daniel@...ll.ch
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH] gpu: drm: fix possible memory leak in drm_addmap_core()

map->handle need to be handled correctly when map->type is _DRM_SHM or
_DRM_CONSISTENT just like map->type is _DRM_REGISTERS.

Fixes: 8d153f7107ff ("drm: update user token hashing and map handles")
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
---
 drivers/gpu/drm/drm_bufs.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c
index fcca21e8efac..2b3f504c5f9c 100644
--- a/drivers/gpu/drm/drm_bufs.c
+++ b/drivers/gpu/drm/drm_bufs.c
@@ -344,6 +344,15 @@ static int drm_addmap_core(struct drm_device *dev, resource_size_t offset,
 	if (!list) {
 		if (map->type == _DRM_REGISTERS)
 			iounmap(map->handle);
+		else if (map->type == _DRM_SHM) {
+			dev->sigdata.lock = dev->master->lock.hw_lock = NULL;
+			vfree(map->handle);
+		} else if (map->type == _DRM_CONSISTENT) {
+			dma_free_coherent(dev->dev,
+					  map->size,
+					  map->handle,
+					  map->offset);
+		}
 		kfree(map);
 		return -EINVAL;
 	}
@@ -361,6 +370,15 @@ static int drm_addmap_core(struct drm_device *dev, resource_size_t offset,
 	if (ret) {
 		if (map->type == _DRM_REGISTERS)
 			iounmap(map->handle);
+		else if (map->type == _DRM_SHM) {
+			dev->sigdata.lock = dev->master->lock.hw_lock = NULL;
+			vfree(map->handle);
+		} else if (map->type == _DRM_CONSISTENT) {
+			dma_free_coherent(dev->dev,
+					  map->size,
+					  map->handle,
+					  map->offset);
+		}
 		kfree(map);
 		kfree(list);
 		mutex_unlock(&dev->struct_mutex);
-- 
2.25.1