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This fixes a problem introduced in the commit: commit e6c693b705686a590d2fa8f434ff015d8926a349 Author: Stefan Metzmacher <metze@samba.org> Date: Wed Feb 28 17:28:43 2024 +0100 s3:winbindd: pass a NULL ccache to kerberos_return_pac() for a MEMORY ccache It means kerberos_return_pac() will use smb_krb5_cc_new_unique_memory(). ... Before that commit cc was never NULL as generate_krb5_ccache() returned "MEMORY:winbindd_pam_ccache" as fallback. So we called ads_kdestroy("MEMORY:winbindd_pam_ccache"). Now we have cc == NULL if user_ccache_file == NULL. and kerberos_return_pac() uses smb_krb5_cc_new_unique_memory() and krb5_cc_destroy() internally. It means unless user_ccache_file != NULL we should not call ads_kdestroy(cc) as cc is NULL and means we would destroy any global default krb5 ccache. Review with: git show -U25 Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Andreas Schneider <asn@samba.org>