HTTP/3: fixed overflow in prefixed integer parser. Previously, the expression (ch & 0x7f) was promoted to a signed integer. Depending on the platform, the size of this integer could be less than 8 bytes, leading to overflow when handling the higher bits of the result. Also, sign bit of this integer could be replicated when adding to the 64-bit st->value.

/*
 * Copyright (C) Maxim Dounin
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>


char *
ngx_dlerror(void)
{
    u_char         *p;
    static u_char   errstr[NGX_MAX_ERROR_STR];

    p = ngx_strerror(ngx_errno, errstr, NGX_MAX_ERROR_STR);
    *p = '\0';

    return (char *) errstr;
}