[OpenSIPS-Devel] [opensips] presence_dialoginfo: Fix bounds checking by using a helper function. (#177)

[Walter Doekes]

>  		return NULL;
> -	}
> -	memcpy(buf, "sip:", 4);
> -	memcpy(buf+4, pres_user->s, pres_user->len);
> -	buf[pres_user->len+4] = '@';
> -	memcpy(buf + pres_user->len + 5, pres_domain->s, pres_domain->len);
> -	buf[pres_user->len + 5 + pres_domain->len]= '\0';
> -
> -	pres_uri = (str*)pkg_malloc(sizeof(str));
> -	if(pres_uri == NULL)
> -	{
> -		LM_ERR("while allocating memory\n");
> -		return NULL;
> -	}
> -	memset(pres_uri, 0, sizeof(str));

Memset just before setting it.

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https://github.com/OpenSIPS/opensips/pull/177/files#r10510194
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