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Correct buffer size check

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Further in the code the next field from the binary buffer is read. The
check contained an off by one error.
This commit is contained in:
Krzysztof Stachowiak 2018-03-20 11:19:50 +01:00
parent f3ada4adb0
commit bc145f7978
1 changed files with 11 additions and 1 deletions
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12
library/ssl_cli.c
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@ -2662,7 +2662,17 @@ static int ssl_parse_certificate_request( mbedtls_ssl_context *ssl )
cert_type_len = buf[mbedtls_ssl_hs_hdr_len( ssl )];
n = cert_type_len;
if( ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n )
/*
* In the subsequent code there are two paths that make read from buf:
* * the length of the signature algorithms field (if minor version of
* SSL is 3),
* * distinguished name length otherwise.
* Both reach at most the index:
* ...hdr_len + 2 + n,
* therefore the buffer length at this point must be greater than that
* regardless of the actual code path.
*/
if( ssl->in_hslen <= mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,