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Tweak get_new_frec() behaviour in "force" mode.

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get_new_frec() is not supposed to ever free an frec when
the force arg is set. Make this so. In theory, this fixes
a bug, but it's practically impossible to provoke and I have
no evidence that it has ever happened IRL.
This commit is contained in:
Simon Kelley
2025-08-21 13:21:27 +01:00
parent 18195e7bb2
commit b52d1d2017
1 changed files with 27 additions and 23 deletions
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46
src/forward.c
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@@ -3128,36 +3128,40 @@ static struct frec *get_new_frec(time_t now, struct server *master, int force)
/* Don't free DNSSEC sub-queries here, as we may end up with
dangling references to them. They'll go when their "real" query
is freed. */
if (!f->dependent && !force)
if (!f->dependent)
#endif
{
if (difftime(now, f->time) >= 4*TIMEOUT)
{
daemon->metrics[METRIC_DNS_UNANSWERED_QUERY]++;
free_frec(f);
target = f;
}
else if (!oldest || difftime(f->time, oldest->time) <= 0)
oldest = f;
}
if (!force)
{
if (difftime(now, f->time) >= 4*TIMEOUT)
{
daemon->metrics[METRIC_DNS_UNANSWERED_QUERY]++;
free_frec(f);
target = f;
}
else if (!oldest || difftime(f->time, oldest->time) <= 0)
oldest = f;
}
}
if (f->sentto && ((int)difftime(now, f->time)) < TIMEOUT && server_samegroup(f->sentto, master))
count++;
}
if (!force && count >= daemon->ftabsize)
if (!force)
{
query_full(now, master->domain);
return NULL;
}
if (count >= daemon->ftabsize)
{
query_full(now, master->domain);
return NULL;
}
if (!target && oldest && ((int)difftime(now, oldest->time)) >= TIMEOUT)
{
/* can't find empty one, use oldest if there is one and it's older than timeout */
daemon->metrics[METRIC_DNS_UNANSWERED_QUERY]++;
free_frec(oldest);
target = oldest;
if (!target && oldest && ((int)difftime(now, oldest->time)) >= TIMEOUT)
{
/* can't find empty one, use oldest if there is one and it's older than timeout */
daemon->metrics[METRIC_DNS_UNANSWERED_QUERY]++;
free_frec(oldest);
target = oldest;
}
}
if (!target && (target = (struct frec *)whine_malloc(sizeof(struct frec))))