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Commit 75e9ba88 authored by Dhaval Patel's avatar Dhaval Patel
Browse files

drm: limit number of blob property allocation 



Limit number of blob property allocation to avoid
large chunk of memory allocation. It avoids single
client to allocate more than required memory and
frees up memory for other applications.

Change-Id: I1e243d5b06d61be4bc846f7ca95fc94aee7d4761
Signed-off-by: default avatarDhaval Patel <pdhaval@codeaurora.org>
parent 3475f957

drivers/gpu/drm/drm_fops.c

+7 −0
Original line number Diff line number Diff line
@@ -45,6 +45,8 @@ 
/* from BKL pushdown */

DEFINE_MUTEX(drm_global_mutex);



#define MAX_DRM_OPEN_COUNT		20



/**

 * DOC: file operations

 *
@@ -135,6 +137,11 @@ int drm_open(struct inode *inode, struct file *filp) 
	if (!dev->open_count++)

		need_setup = 1;



	if (dev->open_count >= MAX_DRM_OPEN_COUNT) {

		retcode = -EPERM;

		goto err_undo;

	}



	/* share address_space across all char-devs of a single device */

	filp->f_mapping = dev->anon_inode->i_mapping;

drivers/gpu/drm/drm_property.c

+13 −2
Original line number Diff line number Diff line
@@ -26,6 +26,9 @@ 


#include "drm_crtc_internal.h"



#define MAX_BLOB_PROP_SIZE	(PAGE_SIZE * 30)

#define MAX_BLOB_PROP_COUNT	250



/**

 * DOC: overview

 *
@@ -554,7 +557,8 @@ drm_property_create_blob(struct drm_device *dev, size_t length, 
	struct drm_property_blob *blob;

	int ret;



	if (!length || length > ULONG_MAX - sizeof(struct drm_property_blob))

	if (!length || length > MAX_BLOB_PROP_SIZE -

				sizeof(struct drm_property_blob))

		return ERR_PTR(-EINVAL);



	blob = vzalloc(sizeof(struct drm_property_blob)+length);
@@ -756,13 +760,20 @@ int drm_mode_createblob_ioctl(struct drm_device *dev, 
			      void *data, struct drm_file *file_priv)

{

	struct drm_mode_create_blob *out_resp = data;

	struct drm_property_blob *blob;

	struct drm_property_blob *blob, *bt;

	void __user *blob_ptr;

	int ret = 0;

	u32 count = 0;



	if (!drm_core_check_feature(dev, DRIVER_MODESET))

		return -EINVAL;



	list_for_each_entry(bt, &file_priv->blobs, head_file)

		count++;



	if (count == MAX_BLOB_PROP_COUNT)

		return -EINVAL;



	blob = drm_property_create_blob(dev, out_resp->length, NULL);

	if (IS_ERR(blob))

		return PTR_ERR(blob);