Check for NULL ASN1_ITEM when initializeing
[openssl.git] / crypto / asn1 / tasn_fre.c
1 /* tasn_fre.c */
2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
3  * project 2000.
4  */
5 /* ====================================================================
6  * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer. 
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in
17  *    the documentation and/or other materials provided with the
18  *    distribution.
19  *
20  * 3. All advertising materials mentioning features or use of this
21  *    software must display the following acknowledgment:
22  *    "This product includes software developed by the OpenSSL Project
23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24  *
25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26  *    endorse or promote products derived from this software without
27  *    prior written permission. For written permission, please contact
28  *    licensing@OpenSSL.org.
29  *
30  * 5. Products derived from this software may not be called "OpenSSL"
31  *    nor may "OpenSSL" appear in their names without prior written
32  *    permission of the OpenSSL Project.
33  *
34  * 6. Redistributions of any form whatsoever must retain the following
35  *    acknowledgment:
36  *    "This product includes software developed by the OpenSSL Project
37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38  *
39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50  * OF THE POSSIBILITY OF SUCH DAMAGE.
51  * ====================================================================
52  *
53  * This product includes cryptographic software written by Eric Young
54  * (eay@cryptsoft.com).  This product includes software written by Tim
55  * Hudson (tjh@cryptsoft.com).
56  *
57  */
58
59
60 #include <stddef.h>
61 #include <openssl/asn1.h>
62 #include <openssl/asn1t.h>
63 #include <openssl/objects.h>
64
65 static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine);
66
67 /* Free up an ASN1 structure */
68
69 void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it)
70 {
71         asn1_item_combine_free(&val, it, 0);
72 }
73
74 void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
75 {
76         asn1_item_combine_free(pval, it, 0);
77 }
78
79 static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine)
80 {
81         const ASN1_TEMPLATE *tt = NULL, *seqtt;
82         const ASN1_EXTERN_FUNCS *ef;
83         const ASN1_COMPAT_FUNCS *cf;
84         const ASN1_AUX *aux = it->funcs;
85         ASN1_aux_cb *asn1_cb;
86         int i;
87         if(!pval) return;
88         if((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval) return;
89         if(aux && aux->asn1_cb) asn1_cb = aux->asn1_cb;
90         else asn1_cb = 0;
91
92         switch(it->itype) {
93
94                 case ASN1_ITYPE_PRIMITIVE:
95                 if(it->templates) ASN1_template_free(pval, it->templates);
96                 else ASN1_primitive_free(pval, it);
97                 break;
98
99                 case ASN1_ITYPE_MSTRING:
100                 ASN1_primitive_free(pval, it);
101                 break;
102
103                 case ASN1_ITYPE_CHOICE:
104                 if(asn1_cb) {
105                         i = asn1_cb(ASN1_OP_FREE_PRE, pval, it);
106                         if(i == 2) return;
107                 }
108                 i = asn1_get_choice_selector(pval, it);
109                 if(asn1_cb) asn1_cb(ASN1_OP_FREE_PRE, pval, it);
110                 if((i >= 0) && (i < it->tcount)) {
111                         ASN1_VALUE **pchval;
112                         tt = it->templates + i;
113                         pchval = asn1_get_field_ptr(pval, tt);
114                         ASN1_template_free(pchval, tt);
115                 }
116                 if(asn1_cb) asn1_cb(ASN1_OP_FREE_POST, pval, it);
117                 if(!combine) {
118                         OPENSSL_free(*pval);
119                         *pval = NULL;
120                 }
121                 break;
122
123                 case ASN1_ITYPE_COMPAT:
124                 cf = it->funcs;
125                 if(cf && cf->asn1_free) cf->asn1_free(*pval);
126                 break;
127
128                 case ASN1_ITYPE_EXTERN:
129                 ef = it->funcs;
130                 if(ef && ef->asn1_ex_free) ef->asn1_ex_free(pval, it);
131                 break;
132
133                 case ASN1_ITYPE_NDEF_SEQUENCE:
134                 case ASN1_ITYPE_SEQUENCE:
135                 if(asn1_do_lock(pval, -1, it) > 0) return;
136                 if(asn1_cb) {
137                         i = asn1_cb(ASN1_OP_FREE_PRE, pval, it);
138                         if(i == 2) return;
139                 }               
140                 asn1_enc_free(pval, it);
141                 /* If we free up as normal we will invalidate any
142                  * ANY DEFINED BY field and we wont be able to 
143                  * determine the type of the field it defines. So
144                  * free up in reverse order.
145                  */
146                 tt = it->templates + it->tcount - 1;
147                 for(i = 0; i < it->tcount; tt--, i++) {
148                         ASN1_VALUE **pseqval;
149                         seqtt = asn1_do_adb(pval, tt, 0);
150                         if(!seqtt) continue;
151                         pseqval = asn1_get_field_ptr(pval, seqtt);
152                         ASN1_template_free(pseqval, seqtt);
153                 }
154                 if(asn1_cb) asn1_cb(ASN1_OP_FREE_POST, pval, it);
155                 if(!combine) {
156                         OPENSSL_free(*pval);
157                         *pval = NULL;
158                 }
159                 break;
160         }
161 }
162
163 void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)
164 {
165         int i;
166         if(tt->flags & ASN1_TFLG_SK_MASK) {
167                 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval;
168                 for(i = 0; i < sk_ASN1_VALUE_num(sk); i++) {
169                         ASN1_VALUE *vtmp;
170                         vtmp = sk_ASN1_VALUE_value(sk, i);
171                         asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item), 0);
172                 }
173                 sk_ASN1_VALUE_free(sk);
174                 *pval = NULL;
175         } else asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item),
176                                                 tt->flags & ASN1_TFLG_COMBINE);
177 }
178
179 void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
180 {
181         int utype;
182         if(it) {
183                 const ASN1_PRIMITIVE_FUNCS *pf;
184                 pf = it->funcs;
185                 if(pf && pf->prim_free) {
186                         pf->prim_free(pval, it);
187                         return;
188                 }
189         }
190         /* Special case: if 'it' is NULL free contents of ASN1_TYPE */
191         if(!it) {
192                 ASN1_TYPE *typ = (ASN1_TYPE *)*pval;
193                 utype = typ->type;
194                 pval = (ASN1_VALUE **)&typ->value.ptr;
195                 if(!*pval) return;
196         } else if(it->itype == ASN1_ITYPE_MSTRING) {
197                 utype = -1;
198                 if(!*pval) return;
199         } else {
200                 utype = it->utype;
201                 if((utype != V_ASN1_BOOLEAN) && !*pval) return;
202         }
203
204         switch(utype) {
205                 case V_ASN1_OBJECT:
206                 ASN1_OBJECT_free((ASN1_OBJECT *)*pval);
207                 break;
208
209                 case V_ASN1_BOOLEAN:
210                 if (it)
211                         *(ASN1_BOOLEAN *)pval = it->size;
212                 else
213                         *(ASN1_BOOLEAN *)pval = -1;
214                 return;
215
216                 case V_ASN1_NULL:
217                 break;
218
219                 case V_ASN1_ANY:
220                 ASN1_primitive_free(pval, NULL);
221                 OPENSSL_free(*pval);
222                 break;
223
224                 default:
225                 ASN1_STRING_free((ASN1_STRING *)*pval);
226                 *pval = NULL;
227                 break;
228         }
229         *pval = NULL;
230 }