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Lock dispatch manager buffer_lock before accessing buffers;

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Only test buffers for UDP dispatches.
This commit is contained in:
Mark Andrews 2019-11-22 12:55:03 +11:00
parent afc7389ce8
commit 011af4de71
1 changed files with 8 additions and 2 deletions
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10
lib/dns/dispatch.c
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@ -1500,8 +1500,14 @@ startrecv(dns_dispatch_t *disp, dispsocket_t *dispsock) {
if (disp->recv_pending != 0 && dispsock == NULL)
return (ISC_R_SUCCESS);
if (disp->mgr->buffers >= disp->mgr->maxbuffers)
return (ISC_R_NOMEMORY);
if (disp->socktype == isc_sockettype_udp) {
LOCK(&disp->mgr->buffer_lock);
if (disp->mgr->buffers >= disp->mgr->maxbuffers) {
UNLOCK(&disp->mgr->buffer_lock);
return (ISC_R_NOMEMORY);
}
UNLOCK(&disp->mgr->buffer_lock);
}
if ((disp->attributes & DNS_DISPATCHATTR_EXCLUSIVE) != 0 &&
dispsock == NULL)