diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index e1a15fbc6ad0..d00a3b015635 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -1780,6 +1780,8 @@ static int __nvmem_cell_entry_write(struct nvmem_cell_entry *cell, void *buf, si
 		return -EINVAL;
 
 	if (cell->bit_offset || cell->nbits) {
+		if (len != BITS_TO_BYTES(cell->nbits) && len != cell->bytes)
+			return -EINVAL;
 		buf = nvmem_cell_prepare_write_buffer(cell, buf, len);
 		if (IS_ERR(buf))
 			return PTR_ERR(buf);