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Reference docs don't define what happens if you call krb5_realm_compare() with
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malformed krb5_principal structures. Define a behavior which keeps it from
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crashing if applications don't check ahead of time.
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diff -up krb5-1.7/src/lib/krb5/krb/princ_comp.c krb5-1.7/src/lib/krb5/krb/princ_comp.c
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--- krb5-1.7/src/lib/krb5/krb/princ_comp.c 2009-01-03 18:19:42.000000000 -0500
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+++ krb5-1.7/src/lib/krb5/krb/princ_comp.c 2009-06-04 14:31:26.000000000 -0400
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@@ -40,6 +40,12 @@ realm_compare_flags(krb5_context context
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const krb5_data *realm1 = krb5_princ_realm(context, princ1);
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const krb5_data *realm2 = krb5_princ_realm(context, princ2);
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+ if ((princ1 == NULL) || (princ2 == NULL))
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+ return FALSE;
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+
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+ if ((realm1 == NULL) || (realm2 == NULL))
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+ return FALSE;
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+
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if (realm1->length != realm2->length)
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return FALSE;
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@@ -91,6 +97,9 @@ krb5_principal_compare_flags(krb5_contex
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krb5_principal upn2 = NULL;
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krb5_boolean ret = FALSE;
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+ if ((princ1 == NULL) || (princ2 == NULL))
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+ return FALSE;
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+
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if (flags & KRB5_PRINCIPAL_COMPARE_ENTERPRISE) {
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/* Treat UPNs as if they were real principals */
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if (krb5_princ_type(context, princ1) == KRB5_NT_ENTERPRISE_PRINCIPAL) {
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