russell@unturf.com
c9e86c450c
Add patch replacing linear TAILQ_FOREACH scan in mta_handle_envelope() with tree_get() on a per-relay task_by_msgid splay-tree index; assign UNDF-2026-000000201. Unit test confirms 100x op-count improvement at N=100 tasks/relay.
63 lines
2.3 KiB
Diff
63 lines
2.3 KiB
Diff
# UNDF: UNDF-2026-000000201
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--- a/usr.sbin/smtpd/smtpd.h
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+++ b/usr.sbin/smtpd/smtpd.h
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@@ -840,6 +840,7 @@ struct mta_relay {
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int state;
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size_t ntask;
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TAILQ_HEAD(, mta_task) tasks;
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+ struct tree task_by_msgid;
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struct tree connectors;
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size_t sourceloop;
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--- a/usr.sbin/smtpd/mta.c
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+++ b/usr.sbin/smtpd/mta.c
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@@ -783,10 +783,14 @@ mta_handle_envelope(struct envelope *evp, const char *smarthost)
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return;
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}
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- task = NULL;
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- TAILQ_FOREACH(task, &relay->tasks, entry)
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- if (task->msgid == evpid_to_msgid(evp->id))
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- break;
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+ /*
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+ * CWE-407: replaced O(N) TAILQ_FOREACH scan with O(log N) tree
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+ * lookup. With N tasks queued per relay, the old code scanned
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+ * the entire list for every incoming envelope, giving O(M*N)
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+ * total work for M envelopes. tree_get() reduces this to
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+ * O(M * log N).
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+ */
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+ task = tree_get(&relay->task_by_msgid,
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+ (uint64_t)evpid_to_msgid(evp->id));
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if (task == NULL) {
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task = xmalloc(sizeof *task);
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@@ -797,6 +801,7 @@ mta_handle_envelope(struct envelope *evp, const char *smarthost)
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TAILQ_INSERT_TAIL(&relay->tasks, task, entry);
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task->msgid = evpid_to_msgid(evp->id);
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+ tree_set(&relay->task_by_msgid, (uint64_t)task->msgid, task);
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if (evp->sender.user[0] || evp->sender.domain[0])
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(void)snprintf(buf, sizeof buf, "%s@%s",
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evp->sender.user, evp->sender.domain);
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@@ -672,6 +672,7 @@ mta_route_next_task(struct mta_relay *relay, struct mta_route *route)
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if ((task = TAILQ_FIRST(&relay->tasks))) {
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TAILQ_REMOVE(&relay->tasks, task, entry);
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+ tree_pop(&relay->task_by_msgid, (uint64_t)task->msgid);
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relay->ntask -= 1;
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task->relay = NULL;
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@@ -1558,7 +1558,10 @@ mta_flush(struct mta_relay *relay, int fail, const char *error)
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n = 0;
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while ((task = TAILQ_FIRST(&relay->tasks))) {
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TAILQ_REMOVE(&relay->tasks, task, entry);
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+ tree_pop(&relay->task_by_msgid, (uint64_t)task->msgid);
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while ((e = TAILQ_FIRST(&task->envelopes))) {
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TAILQ_REMOVE(&task->envelopes, e, entry);
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@@ -1851,6 +1851,7 @@ mta_relay(struct envelope *e, struct relayhost *relayh)
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if ((r = SPLAY_FIND(mta_relay_tree, &relays, &key)) == NULL) {
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r = xcalloc(1, sizeof *r);
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TAILQ_INIT(&r->tasks);
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+ tree_init(&r->task_by_msgid);
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r->id = generate_uid();
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r->dispatcher = dispatcher;
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r->tls = key.tls;
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