after allocation by malloc/sys_malloc/nx_alloc it is necessary immediately to fill variables with values (memset), and set pointers (at least to NULL). Only when this is done, you can assign individual values e.g. myarray[3] = 123; , as frankjiang suggested.
Please don't spread such rumours. You can assign individual values to a certain part of a memory whenever you want - without any restriction. For malloc it is of cause recommended to clear the memory area with memset or another mechanism, but in the case of sys_malloc it is pointless as sys_malloc clears the allocated memory area anyways.
Returns:
void* pointer to the allocated memory area, or NULL when the allocation failed. The area is cleared to zero at allocation.
