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| author | Nikos Mavrogiannopoulos <nmav@redhat.com> | 2014-05-16 19:02:46 +0200 |
|---|---|---|
| committer | Nikos Mavrogiannopoulos <nmav@redhat.com> | 2014-05-16 19:03:32 +0200 |
| commit | cc10a8c5443c751d920cfaca1f104089e43296be (patch) | |
| tree | f3b336ec340bb88fdb7b8f8e8c1fa8eb3045e3e6 /lib/decoding.c | |
| parent | df4b741dfc41c1930fd73a5c7968479196961508 (diff) | |
| download | libtasn1-cc10a8c5443c751d920cfaca1f104089e43296be.tar.gz libtasn1-cc10a8c5443c751d920cfaca1f104089e43296be.tar.bz2 libtasn1-cc10a8c5443c751d920cfaca1f104089e43296be.zip | |
use DECR_LEN() in _asn1_extract_tag_der()
Diffstat (limited to 'lib/decoding.c')
| -rw-r--r-- | lib/decoding.c | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/lib/decoding.c b/lib/decoding.c index 3de6d6d..bfc9dac 100644 --- a/lib/decoding.c +++ b/lib/decoding.c @@ -401,6 +401,7 @@ _asn1_extract_tag_der (asn1_node node, const unsigned char *der, int der_len, { asn1_node p; int counter, len2, len3, is_tag_implicit; + int result; unsigned long tag, tag_implicit = 0; unsigned char class, class2, class_implicit = 0; @@ -428,23 +429,21 @@ _asn1_extract_tag_der (asn1_node node, const unsigned char *der, int der_len, if (p->type & CONST_EXPLICIT) { if (asn1_get_tag_der - (der + counter, der_len - counter, &class, &len2, + (der + counter, der_len, &class, &len2, &tag) != ASN1_SUCCESS) return ASN1_DER_ERROR; - if (counter + len2 > der_len) - return ASN1_DER_ERROR; + DECR_LEN(der_len, len2); counter += len2; len3 = - asn1_get_length_ber (der + counter, der_len - counter, + asn1_get_length_ber (der + counter, der_len, &len2); if (len3 < 0) return ASN1_DER_ERROR; + DECR_LEN(der_len, len2); counter += len2; - if (counter > der_len) - return ASN1_DER_ERROR; if (!is_tag_implicit) { @@ -481,11 +480,11 @@ _asn1_extract_tag_der (asn1_node node, const unsigned char *der, int der_len, if (is_tag_implicit) { if (asn1_get_tag_der - (der + counter, der_len - counter, &class, &len2, + (der + counter, der_len, &class, &len2, &tag) != ASN1_SUCCESS) return ASN1_DER_ERROR; - if (counter + len2 > der_len) - return ASN1_DER_ERROR; + + DECR_LEN(der_len, len2); if ((class != class_implicit) || (tag != tag_implicit)) { @@ -504,18 +503,16 @@ _asn1_extract_tag_der (asn1_node node, const unsigned char *der, int der_len, unsigned type = type_field (node->type); if (type == ASN1_ETYPE_TAG) { - counter = 0; - *ret_len = counter; + *ret_len = 0; return ASN1_SUCCESS; } if (asn1_get_tag_der - (der + counter, der_len - counter, &class, &len2, + (der + counter, der_len, &class, &len2, &tag) != ASN1_SUCCESS) return ASN1_DER_ERROR; - if (counter + len2 > der_len) - return ASN1_DER_ERROR; + DECR_LEN(der_len, len2); switch (type) { @@ -568,6 +565,9 @@ _asn1_extract_tag_der (asn1_node node, const unsigned char *der, int der_len, counter += len2; *ret_len = counter; return ASN1_SUCCESS; + +cleanup: + return result; } static int |