Addenum to "Constify obj_dat.[ch]."
[openssl.git] / crypto / objects / obj_lib.c
index b0b0f2f..23e9d48 100644 (file)
@@ -66,7 +66,8 @@ ASN1_OBJECT *OBJ_dup(const ASN1_OBJECT *o)
        {
        ASN1_OBJECT *r;
        int i;
-       char *ln=NULL;
+       char *ln=NULL,*sn=NULL;
+       unsigned char *data=NULL;
 
        if (o == NULL) return(NULL);
        if (!(o->flags & ASN1_OBJECT_FLAG_DYNAMIC))
@@ -79,41 +80,42 @@ ASN1_OBJECT *OBJ_dup(const ASN1_OBJECT *o)
                OBJerr(OBJ_F_OBJ_DUP,ERR_R_ASN1_LIB);
                return(NULL);
                }
-       r->data=OPENSSL_malloc(o->length);
-       if (r->data == NULL)
+       data=OPENSSL_malloc(o->length);
+       if (data == NULL)
                goto err;
-       memcpy(r->data,o->data,o->length);
+       if (o->data != NULL)
+               memcpy(data,o->data,o->length);
+       /* once data attached to object it remains const */
+       r->data = data;
        r->length=o->length;
        r->nid=o->nid;
        r->ln=r->sn=NULL;
        if (o->ln != NULL)
                {
                i=strlen(o->ln)+1;
-               r->ln=ln=OPENSSL_malloc(i);
-               if (r->ln == NULL) goto err;
+               ln=OPENSSL_malloc(i);
+               if (ln == NULL) goto err;
                memcpy(ln,o->ln,i);
+               r->ln=ln;
                }
 
        if (o->sn != NULL)
                {
-               char *s;
-
                i=strlen(o->sn)+1;
-               r->sn=s=OPENSSL_malloc(i);
-               if (r->sn == NULL) goto err;
-               memcpy(s,o->sn,i);
+               sn=OPENSSL_malloc(i);
+               if (sn == NULL) goto err;
+               memcpy(sn,o->sn,i);
+               r->sn=sn;
                }
        r->flags=o->flags|(ASN1_OBJECT_FLAG_DYNAMIC|
                ASN1_OBJECT_FLAG_DYNAMIC_STRINGS|ASN1_OBJECT_FLAG_DYNAMIC_DATA);
        return(r);
 err:
        OBJerr(OBJ_F_OBJ_DUP,ERR_R_MALLOC_FAILURE);
-       if (r != NULL)
-               {
-               if (ln != NULL) OPENSSL_free(ln);
-               if (r->data != NULL) OPENSSL_free(r->data);
-               OPENSSL_free(r);
-               }
+       if (ln != NULL)         OPENSSL_free(ln);
+       if (sn != NULL)         OPENSSL_free(sn);
+       if (data != NULL)       OPENSSL_free(data);
+       if (r != NULL)          OPENSSL_free(r);
        return(NULL);
        }