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fix: dev: Fix a logic error in cache_name()

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A change in 6aba56ae8 (checking whether a rejected RRset was identical
to the data it would have replaced, so that we could still cache a
signature) inadvertently introduced cases where processing of a
response would continue when previously it would have been skipped.

Closes #5197

Merge branch '5197-cache_name-logic-error' into 'main'

See merge request isc-projects/bind9!10157
This commit is contained in:
Evan Hunt 2025-02-24 23:39:23 +00:00
commit 02ef8ff01c
1 changed files with 14 additions and 13 deletions
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27
lib/dns/resolver.c
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@ -6103,7 +6103,8 @@ cache_name(fetchctx_t *fctx, dns_name_t *name, dns_message_t *message,
if (result == DNS_R_UNCHANGED) {
result = ISC_R_SUCCESS;
if (!need_validation &&
ardataset != NULL)
ardataset != NULL &&
NEGATIVE(ardataset))
{
/*
* The answer in the
@ -6117,12 +6118,17 @@ cache_name(fetchctx_t *fctx, dns_name_t *name, dns_message_t *message,
if (NXDOMAIN(ardataset)) {
eresult =
DNS_R_NCACHENXDOMAIN;
} else if (NEGATIVE(ardataset))
{
} else {
eresult =
DNS_R_NCACHENXRRSET;
}
continue;
} else if (!need_validation &&
ardataset != NULL &&
sigrdataset != NULL &&
!dns_rdataset_equals(
rdataset, ardataset))
{
/*
* The cache wasn't updated
* because something was
@ -6130,16 +6136,11 @@ cache_name(fetchctx_t *fctx, dns_name_t *name, dns_message_t *message,
* data was the same as what
* we were trying to add,
* then sigrdataset might
* still be useful. If
* not, move on.
* still be useful, and we
* should carry on caching
* it. Otherwise, move on.
*/
if (sigrdataset != NULL &&
!dns_rdataset_equals(
rdataset,
addedrdataset))
{
continue;
}
continue;
}
}
if (result != ISC_R_SUCCESS) {