diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index 390547b992ac..3264c99bd68a 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -531,12 +531,14 @@ static ssize_t read_kcore_iter(struct kiocb *iocb, struct iov_iter *iter)
 			 * again until we are done.
 			 */
 			while (true) {
-				read += vread_iter(iter, src, left);
+				size_t n = vread_iter(iter, src, left);
+
+				read += n;
 				if (read == tsz)
 					break;
 
-				src += read;
-				left -= read;
+				src += n;
+				left -= n;
 
 				if (fault_in_iov_iter_writeable(iter, left)) {
 					ret = -EFAULT;