TeaSpeak/tomcrypt
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let's use an empty list element to signal an empty sequence

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This commit is contained in:
Steffen Jaeckel 2015-09-10 19:06:01 +02:00
parent 39b2a8daca
commit 27722734b2
1 changed files with 28 additions and 14 deletions
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42
src/pk/asn1/der/sequence/der_decode_sequence_flexi.c
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@ -53,6 +53,25 @@ static unsigned long fetch_length(const unsigned char *in, unsigned long inlen,
return z+*data_offset;
}
static int new_element(ltc_asn1_list **l)
{
/* alloc new link */
if (*l == NULL) {
*l = XCALLOC(1, sizeof(ltc_asn1_list));
if (*l == NULL) {
return CRYPT_MEM;
}
} else {
(*l)->next = XCALLOC(1, sizeof(ltc_asn1_list));
if ((*l)->next == NULL) {
return CRYPT_MEM;
}
(*l)->next->prev = *l;
*l = (*l)->next;
}
return CRYPT_OK;
}
/**
ASN.1 DER Flexi(ble) decoder will decode arbitrary DER packets and create a linked list of the decoded elements.
@param in The input buffer
@ -73,6 +92,13 @@ int der_decode_sequence_flexi(const unsigned char *in, unsigned long *inlen, ltc
l = NULL;
totlen = 0;
if (*inlen == 0) {
/* alloc new link */
if ((err = new_element(&l)) != CRYPT_OK) {
goto error;
}
}
/* scan the input and and get lengths and what not */
while (*inlen) {
/* read the type byte */
@ -86,20 +112,8 @@ int der_decode_sequence_flexi(const unsigned char *in, unsigned long *inlen, ltc
}
/* alloc new link */
if (l == NULL) {
l = XCALLOC(1, sizeof(*l));
if (l == NULL) {
err = CRYPT_MEM;
goto error;
}
} else {
l->next = XCALLOC(1, sizeof(*l));
if (l->next == NULL) {
err = CRYPT_MEM;
goto error;
}
l->next->prev = l;
l = l->next;
if ((err = new_element(&l)) != CRYPT_OK) {
goto error;
}
if ((type & 0x20) && (type != 0x30) && (type != 0x31)) {