Memory corruption when using struct pointers with function parameters in C
I've hit a wall trying to I'm having trouble with I've been struggling with this for a few days now and could really use some help. I'm experiencing memory corruption issues in my C program when passing struct pointers as function parameters. My struct is defined to hold configuration settings, and I'm trying to update its values within a function, but after the function call, the values seem to be corrupted. Here’s a minimal example of what I’m working with: ```c #include <stdio.h> #include <string.h> typedef struct { int id; char name[20]; } Config; void updateConfig(Config *cfg) { cfg->id = 100; strcpy(cfg->name, "Updated Config"); } int main() { Config myConfig; myConfig.id = 1; strcpy(myConfig.name, "Initial Config"); printf("Before update: id=%d, name=%s\n", myConfig.id, myConfig.name); updateConfig(&myConfig); printf("After update: id=%d, name=%s\n", myConfig.id, myConfig.name); // Intentionally corrupting memory myConfig.id = 2; strcpy(myConfig.name, "Corrupted Config"); printf("Post corruption: id=%d, name=%s\n", myConfig.id, myConfig.name); return 0; } ``` When I run this code, the output before updating the config is correct, but after I modify `myConfig`, the `name` field seems to hold garbage values. Specifically, if I change the `id` to 2 and then print the name, it sometimes contains unexpected characters. I'm not sure if I’m running into a stack overflow or if there's a memory alignment scenario at play. I've checked that the `strcpy` operation does not exceed the bounds of the `name` array. I also ensured that I’m not passing a NULL pointer to the `updateConfig` function. I've tried running this code on both GCC 10.2 and Clang 12.0, and the behavior is consistent. Does anyone have insights on why this memory corruption might be happening or suggestions on how I can debug this further? I'm working on a service that needs to handle this. What am I doing wrong? My development environment is Ubuntu 22.04. I'd really appreciate any guidance on this. I'm working on a mobile app that needs to handle this. For context: I'm using C on Ubuntu 20.04. Any ideas how to fix this?