Jason Yundt d5e893fcb4 Prevent potential uninitialized memory access ...

Before this change, cf_OpenLibrary() did something along the lines of
this:

  char id[4];
  fread(id, 4, 1, fp);
  strncmp(id, "HOG2", 4);

If fread() finishes successfully, then that code is fine. However,
fread() might encounter an error or bump into the end of a file. In
those scenarios, the value of id will not necessarily be initialized
[1]. In other words, when fread() fails, strncmp() might operate on
uninitialized memory.

This change makes sure that the value of id only gets used if fread()
succeeds. Additionally, this change fixes a GCC warning about ignoring
fread()’s return value.

[1]: <https://en.cppreference.com/w/cpp/io/c/fread>

2024-05-12 20:38:35 -04:00

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