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The compiler is entitled to store a char[] local variable with no particular alignment requirement. Our RADIUS code cavalierly took such a local variable and cast its address to a struct type that does have alignment requirements. On an alignment-picky machine this would lead to bus errors. To fix, declare the local variable honestly, and then cast its address to char * for use in the I/O calls. Given the lack of field complaints, there must be very few if any people affected; but nonetheless this is a clear portability issue, so back-patch to all supported branches. Noted while looking at a Coverity complaint in the same code.