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(decrypt_internal_special): do not not modify the original data

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test case from Ronnie Sahlberg <ronnie_sahlberg@ozemail.com.au>


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@13421 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
2004-03-06 16:36:46 +00:00
parent 601b8fcfa3
commit 5065dd4bc7
1 changed files with 14 additions and 10 deletions
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24
lib/krb5/crypto.c
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 1997 - 2003 Kungliga Tekniska H<>gskolan
* Copyright (c) 1997 - 2004 Kungliga Tekniska H<>gskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
@@ -3157,8 +3157,7 @@ decrypt_internal_special(krb5_context context,
struct encryption_type *et = crypto->et;
size_t cksum_sz = CHECKSUMSIZE(et->checksum);
size_t sz = len - cksum_sz - et->confoundersize;
char *cdata = (char *)data;
char *tmp;
unsigned char *p;
krb5_error_code ret;
if ((len % et->padsize) != 0) {
@@ -3166,21 +3165,26 @@ decrypt_internal_special(krb5_context context,
return KRB5_BAD_MSIZE;
}
tmp = malloc (sz);
if (tmp == NULL) {
p = malloc (len);
if (p == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
memcpy(p, data, len);
ret = (*et->encrypt)(context, &crypto->key, data, len, FALSE, usage, ivec);
ret = (*et->encrypt)(context, &crypto->key, p, len, FALSE, usage, ivec);
if (ret) {
free(tmp);
free(p);
return ret;
}
memcpy (tmp, cdata + cksum_sz + et->confoundersize, sz);
result->data = tmp;
memmove (p, p + cksum_sz + et->confoundersize, sz);
result->data = realloc(p, sz);
if(result->data == NULL) {
free(p);
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
result->length = sz;
return 0;
}