Memory leak in krb5-libs > 1.10.3-33

Issue

• On our nameserver nodes that the latest version of the kerberos libraries (1.10.3-37) is buggy and leaks memory.
• The previous version (1.10.3-33) works ok.
• We could reproduce the issue within valgrind, and here is the output of the loss :

==2217== 145,064 (3,072 direct, 141,992 indirect) bytes in 96 blocks are definitely lost in loss record 359 of 366
==2217== at 0x4A06A2E: malloc (vg_replace_malloc.c:270)
==2217== by 0x3BCAC684D2: krb5_pac_init (pac.c:231)
==2217== by 0x3BCAC68B3D: krb5_pac_parse (pac.c:332)
==2217== by 0x18DBDC56: ???
==2217== by 0x3BCAC50DB2: krb5int_authdata_verify (authdata.c:617)
==2217== by 0x3BCAC707CF: rd_req_decoded_opt (rd_req_dec.c:437)
==2217== by 0x3BCAC70859: krb5_rd_req_decoded (rd_req_dec.c:599)
==2217== by 0x3BCAC6F888: krb5_rd_req (rd_req.c:87)
==2217== by 0x3BCB81C770: kg_accept_krb5 (accept_sec_context.c:643)
==2217== by 0x3BCB81E0A9: krb5_gss_accept_sec_context_ext (accept_sec_context.c:1338)
==2217== by 0x3BCB81E208: krb5_gss_accept_sec_context (accept_sec_context.c:1367)
==2217== by 0x3BCB80DC22: gss_accept_sec_context (g_accept_sec_context.c:203)
==2217== by 0x18BB9738: Csec_server_establish_context_ext_KRB5 (Csec_plugin_GSS.c:482)
==2217== by 0x365BE02BC2: Csec_server_establish_context_ext_caller (Csec_plugin.h:129)
==2217== by 0x365BE0816A: Csec_server_establish_context_ext (Csec_api.c:277)
==2217== by 0x365BE07FE4: Csec_server_establishContext (Csec_api.c:218)
==2217== by 0x406447: doit (Cns_main.c:747)
==2217== by 0x365B628930: _Cpool_starter (Cpool.c:377)
==2217== by 0x365B623E24: _Cthread_start_pthread (Cthread.c:209)
==2217== by 0x3BC44079D0: start_thread (pthread_create.c:301)
==2217== by 0x3BC40E88FC: clone (clone.S:115)
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• Also reproduced it with latest krb5-libs-1.10.3-42.