staging: ion: Fix error handling in ion_buffer_create

This patch fixes error handling case when buffer->pages allocation
fails. Also, it removes unreachable code of checking ret variable
although it is not updated.

Signed-off-by: Rohit kumar <rohit.kr@samsung.com>
Reviewed-by: Laura Abbott <labbott@redhat.com>
Suggested-by: Pintu Kumar <pintu.k@samsung.com>
Reviewed-by: Pintu Kumar <pintu.k@samsung.com>
Reviewed-by: Gioh Kim <gioh.kim@lge.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/ion/ion.c

@@ -213,10 +213,10 @@ static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
 			"heap->ops->map_dma should return ERR_PTR on error"))
 		table = ERR_PTR(-EINVAL);
 	if (IS_ERR(table)) {
-		heap->ops->free(buffer);
-		kfree(buffer);
-		return ERR_CAST(table);
+		ret = -EINVAL;
+		goto err1;
 	}
+
 	buffer->sg_table = table;
 	if (ion_buffer_fault_user_mappings(buffer)) {
 		int num_pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
@@ -226,7 +226,7 @@ static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
 		buffer->pages = vmalloc(sizeof(struct page *) * num_pages);
 		if (!buffer->pages) {
 			ret = -ENOMEM;
-			goto err1;
+			goto err;
 		}
 
 		for_each_sg(table->sgl, sg, table->nents, i) {
@@ -235,9 +235,6 @@ static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
 			for (j = 0; j < sg->length / PAGE_SIZE; j++)
 				buffer->pages[k++] = page++;
 		}
-
-		if (ret)
-			goto err;
 	}
 
 	buffer->dev = dev;
@@ -263,9 +260,8 @@ static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
 
 err:
 	heap->ops->unmap_dma(heap, buffer);
-	heap->ops->free(buffer);
 err1:
-	vfree(buffer->pages);
+	heap->ops->free(buffer);
 err2:
 	kfree(buffer);
 	return ERR_PTR(ret);