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Improve the buffer pointer check in write pre_shared key

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Signed-off-by: XiaokangQian <xiaokang.qian@arm.com>
This commit is contained in:
XiaokangQian 2022-07-21 08:19:06 +00:00 committed by Ronald Cron
parent 3ad67bf4e3
commit bee71453b2
1 changed files with 4 additions and 1 deletions
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5
library/ssl_tls13_client.c
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@ -783,26 +783,29 @@ int mbedtls_ssl_tls13_write_identities_of_pre_shared_key_ext(
identities_len = 6 + psk_identity_len;
l_binders_len = 1 + hash_len;
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 + 2 + identities_len + 2 + l_binders_len );
MBEDTLS_SSL_DEBUG_MSG( 3,
( "client hello, adding pre_shared_key extension, "
"omitting PSK binder list" ) );
/* Extension header */
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 8 );
MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_PRE_SHARED_KEY, p, 0 );
MBEDTLS_PUT_UINT16_BE( 2 + identities_len + 2 + l_binders_len , p, 2 );
MBEDTLS_PUT_UINT16_BE( identities_len, p, 4 );
MBEDTLS_PUT_UINT16_BE( psk_identity_len, p, 6 );
p += 8;
MBEDTLS_SSL_CHK_BUF_PTR( p, end, psk_identity_len );
memcpy( p, psk_identity, psk_identity_len );
p += psk_identity_len;
/* add obfuscated ticket age */
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 );
MBEDTLS_PUT_UINT32_BE( obfuscated_ticket_age, p, 0 );
p += 4;
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 + l_binders_len );
*out_len = ( p - buf ) + l_binders_len + 2;
*binders_len = l_binders_len + 2;