1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index d91e051d1367..52d24ea49533 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -790,6 +790,15 @@ static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
 		goto out;
 	}
 
+	if (idev->info->mem[mi].readonly) {
+		if (vma->vm_flags & VM_WRITE) {
+			ret = -EINVAL;
+			goto out;
+		}
+
+		vma->vm_flags &= ~VM_MAYWRITE;
+	}
+
 	if (idev->info->mmap) {
 		ret = idev->info->mmap(idev->info, vma);
 		goto out;