Avoid wraparound for ssl->in_left
Add check to avoid wraparound for ssl->in_left
@@ -2422,6 +2422,14 @@ int mbedtls_ssl_fetch_input( mbedtls_ssl_context *ssl, size_t nb_want )
if( ret < 0 )
return( ret );
+ // At this point ret value is positive, verify that adding ret
+ // value to ssl->in_left doesn't cause a wraparound
+ if (ssl->in_left + (size_t)ret < ssl->in_left)
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "wraparound happened over in_left value" ) );
+ return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+ }
+
ssl->in_left += ret;
}
}
