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Commit 90b6f305 authored by Daniel De Graaf's avatar Daniel De Graaf Committed by Konrad Rzeszutek Wilk
Browse files

xen-gntdev: Fix memory leak when mmap fails 



The error path did not decrement the reference count of the grant structure.

Signed-off-by: default avatarDaniel De Graaf <dgdegra@tycho.nsa.gov>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent bdc612dc

drivers/xen/gntdev.c

+8 −6
Original line number Diff line number Diff line
@@ -650,15 +650,13 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma) 
					  find_grant_ptes, map);

		if (err) {

			printk(KERN_WARNING "find_grant_ptes() failure.\n");

			return err;

			goto out_put_map;

		}

	}



	err = map_grant_pages(map);

	if (err) {

		printk(KERN_WARNING "map_grant_pages() failure.\n");

		return err;

	}

	if (err)

		goto out_put_map;



	map->is_mapped = 1;
@@ -667,7 +665,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma) 
			err = vm_insert_page(vma, vma->vm_start + i*PAGE_SIZE,

				map->pages[i]);

			if (err)

				return err;

				goto out_put_map;

		}

	}
@@ -676,6 +674,10 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma) 
unlock_out:

	spin_unlock(&priv->lock);

	return err;



out_put_map:

	gntdev_put_map(map);

	return err;

}



static const struct file_operations gntdev_fops = {