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From 3d48a475054911856b736ca2720b82f529dd68cf Mon Sep 17 00:00:00 2001
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From: Noriko Hosoi <nhosoi@redhat.com>
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Date: Wed, 1 Oct 2014 14:20:27 -0700
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Subject: [PATCH] Bug 1147659 - cyrus-sasl client library (client.c) is not
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thread safe
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Description: client_dispose (lib/clinet.c) which closes a connection
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of a sasl client frees mech_list if the head of the list differs
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from the head of the global cmechlist->mech_list. But there was a
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possibility that the list appears in the middle of the global mech
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list. By freeing the mech, it crashed a multi-threaded sasl client.
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This patch checks each mech if it is in the global mech list or not.
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Only if it is not, the mech is freed.
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---
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lib/client.c | 27 +++++++++++++++++++++++++++
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1 file changed, 27 insertions(+)
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diff --git a/lib/client.c b/lib/client.c
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index 31fe346..3f76483 100644
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--- a/lib/client.c
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+++ b/lib/client.c
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@@ -324,6 +324,26 @@ int sasl_client_init(const sasl_callback_t *callbacks)
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return ret;
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}
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+/*
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+ * If mech is in cmechlist->mech_list, return 1
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+ * Otherwise, return 0
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+ */
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+static int mech_is_in_cmechlist(cmechanism_t *mech)
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+{
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+ cmechanism_t *m = cmechlist->mech_list;
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+ if (NULL == mech) {
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+ return 0;
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+ }
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+
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+ while (m && mech) {
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+ if (m == mech) {
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+ return 1;
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+ }
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+ m = m->next;
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+ }
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+ return 0;
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+}
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+
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static void client_dispose(sasl_conn_t *pconn)
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{
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sasl_client_conn_t *c_conn=(sasl_client_conn_t *) pconn;
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@@ -352,6 +372,13 @@ static void client_dispose(sasl_conn_t *pconn)
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while (m) {
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prevm = m;
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m = m->next;
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+ if (mech_is_in_cmechlist(prevm)) {
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+ /*
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+ * If prevm exists in the global mech_list cmechlist->mech_list,
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+ * we should not free it as well as the rest of the list.
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+ */
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+ break;
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+ }
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sasl_FREE(prevm);
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}
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}
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--
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1.9.3
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