bug#17334: 24.3; Crash in cmdproxy.exe

[Sohail Somani]

There is a "bug" in cmdproxy.exe which should never happen, but does
anyway. In make_absolute, there is the following code:

  strncpy(dir, path, p - path);
  dir[p - path] = '\0';

If p-path > sizeof(dir), a buffer overrun occurs.

I came across this problem because I accidentally used ':' as a
separator when constructing the PATH variable in Emacs.

Thanks,

Sohail