Lecture
This lecture covers dynamic memory allocation in the C programming language, focusing on the functions malloc and calloc. The instructor explains how these functions are used to allocate memory dynamically, detailing their syntax and the importance of specifying the size of the memory to be allocated. The lecture highlights the differences between malloc and calloc, emphasizing that calloc initializes the allocated memory to zero, which helps prevent errors such as buffer overflows. An example from OpenSSH is presented to illustrate a common bug that can occur when using malloc incorrectly, demonstrating the potential risks of integer overflow during memory allocation. The instructor advises using calloc for allocating multiple elements consecutively to avoid such issues. Additionally, the lecture discusses the importance of checking the return value of malloc and calloc to ensure successful memory allocation, and it introduces the memset function for initializing memory. Overall, the lecture provides a comprehensive overview of memory management in C, essential for effective programming practices.