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netmgr: have a single source of truth for tcpdns callback

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We pass interface as an opaque argument to tcpdns listening socket.
If we stop listening on an interface but still have in-flight connections
the opaque 'interface' is not properly reference counted, and we might
hit a dead memory. We put just a single source of truth in a listening
socket and make the child sockets use that instead of copying the
value from listening socket. We clean the callback when we stop listening.
This commit is contained in:
Witold Kręcicki
2020-01-15 14:53:42 +01:00
parent 0d637b5985
commit eda4300bbb
3 changed files with 24 additions and 10 deletions
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5
lib/ns/client.c
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@@ -1625,6 +1625,11 @@ ns__client_request(isc_nmhandle_t *handle, isc_region_t *region, void *arg) {
ifp = (ns_interface_t *) arg;
mgr = ifp->clientmgr;
if (mgr == NULL) {
/* The interface was shut down in the meantime, just bail */
return;
}
REQUIRE(VALID_MANAGER(mgr));
client = isc_nmhandle_getdata(handle);