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Fix an ADB quota management error in the resolver

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Normally, when a 'resquery_t' object is created in fctx_query(),
we call dns_adb_beginudpfetch() (which increases the ADB quota)
only if it's a UDP query. Then, in fctx_cancelquery(), we call
dns_adb_endudpfetch() to decreases back the ADB quota, again only
if it's a UDP query.

The problem is that a UDP query can become a TCP query, preventing
the quota from adjusting back in fctx_cancelquery() later.

Call dns_adb_beginudpfetch() also when switching the query type
from UDP to TCP.

(cherry picked from commit 53afe1f978)
This commit is contained in:
Aram Sargsyan 2022-12-22 13:48:33 +00:00 committed by Arаm Sаrgsyаn
parent 650f3098e1
commit 926f0323b6
1 changed files with 10 additions and 1 deletions
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11
lib/dns/resolver.c
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@ -2633,7 +2633,16 @@ resquery_send(resquery_t *query) {
hint = dns_adb_getudpsize(fctx->adb,
query->addrinfo);
} else if (tried->count >= 2U) {
query->options |= DNS_FETCHOPT_TCP;
if ((query->options & DNS_FETCHOPT_TCP) == 0) {
/*
* Inform the ADB that we're ending a
* UDP fetch, and turn the query into
* a TCP query.
*/
dns_adb_endudpfetch(fctx->adb,
query->addrinfo);
query->options |= DNS_FETCHOPT_TCP;
}
}
}
}