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On exactly-sized Strings, the String::c_ptr() function peeked beyond the end of the buffer, possibly into unititialized space to see whether the buffer was NUL-terminated. In a place that did peek improperly, we now use a c_ptr_safe() function, which doesn't peek where it shouldn't. client/sql_string.h: Back-port String::c_ptr_safe(). sql/item_func.h: Describe side-effect behavior. sql/item_strfunc.cc: Use the "_safe" version of c_ptr to avoid looking for a terminating NUL character outside the initialized memory area. Valgrind hates it when one does that, and it theoretically could lead to a SEGV. sql/sql_string.h: Back-port String::c_ptr_safe().