1 files changed, 59 insertions, 8 deletions

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index b8465243eca2..f264b70c383e 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -76,10 +76,6 @@ static void dma_buf_release(struct dentry *dentry)
 
 	dmabuf->ops->release(dmabuf);
 
-	mutex_lock(&db_list.lock);
-	list_del(&dmabuf->list_node);
-	mutex_unlock(&db_list.lock);
-
 	if (dmabuf->resv == (struct dma_resv *)&dmabuf[1])
 		dma_resv_fini(dmabuf->resv);
 
@@ -88,6 +84,22 @@ static void dma_buf_release(struct dentry *dentry)
 	kfree(dmabuf);
 }
 
+static int dma_buf_file_release(struct inode *inode, struct file *file)
+{
+	struct dma_buf *dmabuf;
+
+	if (!is_dma_buf_file(file))
+		return -EINVAL;
+
+	dmabuf = file->private_data;
+
+	mutex_lock(&db_list.lock);
+	list_del(&dmabuf->list_node);
+	mutex_unlock(&db_list.lock);
+
+	return 0;
+}
+
 static const struct dentry_operations dma_buf_dentry_ops = {
 	.d_dname = dmabuffs_dname,
 	.d_release = dma_buf_release,
@@ -413,6 +425,7 @@ static void dma_buf_show_fdinfo(struct seq_file *m, struct file *file)
 }
 
 static const struct file_operations dma_buf_fops = {
+	.release	= dma_buf_file_release,
 	.mmap		= dma_buf_mmap_internal,
 	.llseek		= dma_buf_llseek,
 	.poll		= dma_buf_poll,
@@ -653,6 +666,34 @@ void dma_buf_put(struct dma_buf *dmabuf)
 }
 EXPORT_SYMBOL_GPL(dma_buf_put);
 
+static void mangle_sg_table(struct sg_table *sg_table)
+{
+#ifdef CONFIG_DMABUF_DEBUG
+	int i;
+	struct scatterlist *sg;
+
+	/* To catch abuse of the underlying struct page by importers mix
+	 * up the bits, but take care to preserve the low SG_ bits to
+	 * not corrupt the sgt. The mixing is undone in __unmap_dma_buf
+	 * before passing the sgt back to the exporter. */
+	for_each_sgtable_sg(sg_table, sg, i)
+		sg->page_link ^= ~0xffUL;
+#endif
+
+}
+static struct sg_table * __map_dma_buf(struct dma_buf_attachment *attach,
+				       enum dma_data_direction direction)
+{
+	struct sg_table *sg_table;
+
+	sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction);
+
+	if (!IS_ERR_OR_NULL(sg_table))
+		mangle_sg_table(sg_table);
+
+	return sg_table;
+}
+
 /**
  * dma_buf_dynamic_attach - Add the device to dma_buf's attachments list
  * @dmabuf:		[in]	buffer to attach device to.
@@ -724,7 +765,7 @@ dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct device *dev,
 				goto err_unlock;
 		}
 
-		sgt = dmabuf->ops->map_dma_buf(attach, DMA_BIDIRECTIONAL);
+		sgt = __map_dma_buf(attach, DMA_BIDIRECTIONAL);
 		if (!sgt)
 			sgt = ERR_PTR(-ENOMEM);
 		if (IS_ERR(sgt)) {
@@ -771,6 +812,16 @@ struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
 }
 EXPORT_SYMBOL_GPL(dma_buf_attach);
 
+static void __unmap_dma_buf(struct dma_buf_attachment *attach,
+			    struct sg_table *sg_table,
+			    enum dma_data_direction direction)
+{
+	/* uses XOR, hence this unmangles */
+	mangle_sg_table(sg_table);
+
+	attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, direction);
+}
+
 /**
  * dma_buf_detach - Remove the given attachment from dmabuf's attachments list
  * @dmabuf:	[in]	buffer to detach from.
@@ -789,7 +840,7 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach)
 		if (dma_buf_is_dynamic(attach->dmabuf))
 			dma_resv_lock(attach->dmabuf->resv, NULL);
 
-		dmabuf->ops->unmap_dma_buf(attach, attach->sgt, attach->dir);
+		__unmap_dma_buf(attach, attach->sgt, attach->dir);
 
 		if (dma_buf_is_dynamic(attach->dmabuf)) {
 			dma_buf_unpin(attach);
@@ -911,7 +962,7 @@ struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach,
 		}
 	}
 
-	sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction);
+	sg_table = __map_dma_buf(attach, direction);
 	if (!sg_table)
 		sg_table = ERR_PTR(-ENOMEM);
 
@@ -974,7 +1025,7 @@ void dma_buf_unmap_attachment(struct dma_buf_attachment *attach,
 	if (dma_buf_is_dynamic(attach->dmabuf))
 		dma_resv_assert_held(attach->dmabuf->resv);
 
-	attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, direction);
+	__unmap_dma_buf(attach, sg_table, direction);
 
 	if (dma_buf_is_dynamic(attach->dmabuf) &&
 	    !IS_ENABLED(CONFIG_DMABUF_MOVE_NOTIFY))