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Fix integer overflow with an input buffer larger than INT_MAX

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Signed-off-by: Gilles Peskine <[email protected]>
This commit is contained in:
Gilles Peskine
2023-09-25 19:59:31 +02:00
parent aa01a038b5
commit 7077781af5
1 changed files with 7 additions and 5 deletions
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library/x509_create.c
+7 -5
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@@ -208,7 +208,7 @@ static int parse_attribute_value_string(const char *s,
* contains a null byte.
*/
static int parse_attribute_value_hex_der_encoded(const char *s,
int len,
size_t len,
unsigned char *data,
size_t *data_len,
int *tag)
@@ -308,10 +308,12 @@ int mbedtls_x509_string_to_names(mbedtls_asn1_named_data **head, const char *nam
mbedtls_free(oid.p);
return MBEDTLS_ERR_X509_INVALID_NAME;
} else if (*s == '#') {
if ((parse_ret =
parse_attribute_value_hex_der_encoded(s + 1, (int) (c - s - 1),
data, &data_len,
&tag)) != 0) {
/* We know that c >= s (loop invariant) and c != s (in this
* else branch), hence c - s - 1 >= 0. */
parse_ret = parse_attribute_value_hex_der_encoded(
s + 1, c - s - 1,
data, &data_len, &tag);
if (parse_ret != 0) {
mbedtls_free(oid.p);
return MBEDTLS_ERR_X509_INVALID_NAME;
}