---

yaml
---
r: 359751
b: refs/heads/master
c: 495c10c
h: refs/heads/master
i:
  359749: d61eb69
  359747: 5024aed
  359743: feda942
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: f00b4dad9d9eb001a04cf72e8351a2a1b9e99322
+refs/heads/master: 495c10cc1c0c359871d5bef32dd173252fc17995

trunk/drivers/base/dma-buf.c

@@ -447,6 +447,9 @@ EXPORT_SYMBOL_GPL(dma_buf_kunmap);
 int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma,
 		 unsigned long pgoff)
 {
+	struct file *oldfile;
+	int ret;
+
 	if (WARN_ON(!dmabuf || !vma))
 		return -EINVAL;
 
@@ -460,14 +463,22 @@ int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma,
 		return -EINVAL;
 
 	/* readjust the vma */
-	if (vma->vm_file)
-		fput(vma->vm_file);
-
-	vma->vm_file = get_file(dmabuf->file);
-
+	get_file(dmabuf->file);
+	oldfile = vma->vm_file;
+	vma->vm_file = dmabuf->file;
 	vma->vm_pgoff = pgoff;
 
-	return dmabuf->ops->mmap(dmabuf, vma);
+	ret = dmabuf->ops->mmap(dmabuf, vma);
+	if (ret) {
+		/* restore old parameters on failure */
+		vma->vm_file = oldfile;
+		fput(dmabuf->file);
+	} else {
+		if (oldfile)
+			fput(oldfile);
+	}
+	return ret;
+
 }
 EXPORT_SYMBOL_GPL(dma_buf_mmap);