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(cherry picked from commit 93049edb81)
This commit is contained in:
Mark Andrews 2017-08-09 09:51:59 +10:00 committed by Mukund Sivaraman
parent 164d30e3a1
commit ef899b41f4
1 changed files with 8 additions and 0 deletions
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8
lib/dns/resolver.c
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@ -7201,6 +7201,14 @@ resume_dslookup(isc_task_t *task, isc_event_t *event) {
dns_rdataset_init(&nameservers);
bucketnum = fctx->bucketnum;
/*
* Note: fevent->rdataset must be disassociated and
* isc_event_free(&event) be called before resuming
* processing of the 'fctx' to prevent use-after-free.
* 'fevent' is set to NULL so as to not have a dangling
* pointer.
*/
if (fevent->result == ISC_R_CANCELED) {
if (dns_rdataset_isassociated(fevent->rdataset)) {
dns_rdataset_disassociate(fevent->rdataset);