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drm/virtio: Handle context ID allocation errors 

It is possible to run out of memory while allocating IDs.  The current
code would create a context with an invalid ID; change it to return
-ENOMEM to userspace.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20180926160031.15721-3-willy@infradead.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Matthew Wilcox 2018-09-26 09:00:29 -07:00 committed by Gerd Hoffmann
parent 1938d1ae32
commit 6a37c49a94
1 changed files with 11 additions and 18 deletions
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29
drivers/gpu/drm/virtio/virtgpu_kms.c
View File

@ -52,31 +52,22 @@ static void virtio_gpu_config_changed_work_func(struct work_struct *work)
events_clear, &events_clear);
}
static void virtio_gpu_ctx_id_get(struct virtio_gpu_device *vgdev,
uint32_t *resid)
static int virtio_gpu_context_create(struct virtio_gpu_device *vgdev,
uint32_t nlen, const char *name)
{
int handle = ida_alloc_min(&vgdev->ctx_id_ida, 1, GFP_KERNEL);
*resid = handle;
}
static void virtio_gpu_ctx_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
{
ida_free(&vgdev->ctx_id_ida, id);
}
static void virtio_gpu_context_create(struct virtio_gpu_device *vgdev,
uint32_t nlen, const char *name,
uint32_t *ctx_id)
{
virtio_gpu_ctx_id_get(vgdev, ctx_id);
virtio_gpu_cmd_context_create(vgdev, *ctx_id, nlen, name);
if (handle < 0)
return handle;
virtio_gpu_cmd_context_create(vgdev, handle, nlen, name);
return handle;
}
static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev,
uint32_t ctx_id)
{
virtio_gpu_cmd_context_destroy(vgdev, ctx_id);
virtio_gpu_ctx_id_put(vgdev, ctx_id);
ida_free(&vgdev->ctx_id_ida, ctx_id);
}
static void virtio_gpu_init_vq(struct virtio_gpu_queue *vgvq,
@ -261,7 +252,7 @@ int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
{
struct virtio_gpu_device *vgdev = dev->dev_private;
struct virtio_gpu_fpriv *vfpriv;
uint32_t id;
int id;
char dbgname[TASK_COMM_LEN];
/* can't create contexts without 3d renderer */
@ -274,7 +265,9 @@ int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
return -ENOMEM;
get_task_comm(dbgname, current);
virtio_gpu_context_create(vgdev, strlen(dbgname), dbgname, &id);
id = virtio_gpu_context_create(vgdev, strlen(dbgname), dbgname);
if (id < 0)
return id;
vfpriv->ctx_id = id;
file->driver_priv = vfpriv;