Application developers have a tendency to use krb5_get_error_message()
as a drop in replacement for error_message() and under various
circumstances they pass in a NULL context. This method works fine
for MIT's implementation which ignores the context but in Heimdal
passing in a NULL context would dump core.
This patch set modifies krb5_get_error_message() in order to
permit the passing of a NULL context. First, if the context
is NULL, an attempt will be made to allocate one locally for
the purpose of evaluating the error code. Second, if a local
context cannot be allocated, fall back on calling error_message().
If error_message() fails to return a string, then generate an
"unknown error" response.
Only if all of the above fails is NULL returned.
Change-Id: If4baf7d6c428cf0baf11c044b8dfd5c2b3cdf7e4
cbf126bede