dax_io(): don't let non-error value escape via retval instead of EFAULT

Signed-off-by: Al Viro <[email protected]> Reported-by: Sasha Levin <[email protected]> Cc: [email protected] # 4.0+ Signed-off-by: Jens Axboe <[email protected]>
jledet · Nov 11, 2015 · cadfbb6 · cadfbb6
1 parent ccc2600
commit cadfbb6
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/fs/dax.c b/fs/dax.c
@@ -169,8 +169,10 @@ static ssize_t dax_io(struct inode *inode, struct iov_iter *iter,
 		else
 			len = iov_iter_zero(max - pos, iter);
 
-		if (!len)
+		if (!len) {
+			retval = -EFAULT;
 			break;
+		}
 
 		pos += len;
 		addr += len;