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Merge branch 'iotssl-519-asn1write-overflows-restricted' into development-restricted

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* iotssl-519-asn1write-overflows-restricted:
  Fix other int casts in bounds checking
  Fix other occurrences of same bounds check issue
  Fix potential buffer overflow in asn1write
This commit is contained in:
Manuel Pégourié-Gonnard
2015-11-02 11:07:30 +09:00
parent 537e2a9b58 bc5e508855
commit bd3639852c
5 changed files with 24 additions and 8 deletions
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15
library/ssl_tls.c
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@ -1105,11 +1105,16 @@ int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exch
#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
if( key_ex == MBEDTLS_KEY_EXCHANGE_PSK )
{
if( end - p < 2 + (int) psk_len )
if( end - p < 2 )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
*(p++) = (unsigned char)( psk_len >> 8 );
*(p++) = (unsigned char)( psk_len );
if( end < p || (size_t)( end - p ) < psk_len )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
memset( p, 0, psk_len );
p += psk_len;
}
else
@ -1177,11 +1182,15 @@ int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exch
}
/* opaque psk<0..2^16-1>; */
if( end - p < 2 + (int) psk_len )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
if( end - p < 2 )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
*(p++) = (unsigned char)( psk_len >> 8 );
*(p++) = (unsigned char)( psk_len );
if( end < p || (size_t)( end - p ) < psk_len )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
memcpy( p, psk, psk_len );
p += psk_len;