diff --git a/lib/mpi/mpicoder.c b/lib/mpi/mpicoder.c
index 39c4c67310946f0fa3fb96fd3b8ae79cf3fe4b97..3cb6bd148fa9e38e8634c592abb8bd85e142c480 100644
--- a/lib/mpi/mpicoder.c
+++ b/lib/mpi/mpicoder.c
@@ -504,7 +504,8 @@ MPI mpi_read_raw_from_sgl(struct scatterlist *sgl, unsigned int nbytes)
 
 	while (sg_miter_next(&miter)) {
 		buff = miter.addr;
-		len = miter.length;
+		len = min_t(unsigned, miter.length, nbytes);
+		nbytes -= len;
 
 		for (x = 0; x < len; x++) {
 			a <<= 8;