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From 7612e65b9bdfe03e5a018e3c897f4a3292c42ee4 Mon Sep 17 00:00:00 2001
Message-Id: <7612e65b9bdfe03e5a018e3c897f4a3292c42ee4.1506941240.git.davide.caratti@gmail.com>
From: Sabrina Dubroca <sd@queasysnail.net>
Date: Tue, 22 Aug 2017 10:34:19 +0200
Subject: [PATCH] mka: Add error handling for secy_init_macsec() calls
secy_init_macsec() can fail (if ->macsec_init fails), and
ieee802_1x_kay_init() should handle this and not let MKA run any
further, because nothing is going to work anyway.
On failure, ieee802_1x_kay_init() must deinit its kay, which will free
kay->ctx, so ieee802_1x_kay_init callers (only ieee802_1x_alloc_kay_sm)
must not do it. Before this patch there is a double-free of the ctx
argument when ieee802_1x_kay_deinit() was called.
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
---
src/pae/ieee802_1x_kay.c | 25 ++++++++++++++-----------
wpa_supplicant/wpas_kay.c | 5 ++---
2 files changed, 16 insertions(+), 14 deletions(-)
diff --git a/src/pae/ieee802_1x_kay.c b/src/pae/ieee802_1x_kay.c
index ff55f88b8..c4bfcbc63 100644
--- a/src/pae/ieee802_1x_kay.c
+++ b/src/pae/ieee802_1x_kay.c
@@ -3100,6 +3100,7 @@ ieee802_1x_kay_init(struct ieee802_1x_kay_ctx *ctx, enum macsec_policy policy,
kay = os_zalloc(sizeof(*kay));
if (!kay) {
wpa_printf(MSG_ERROR, "KaY-%s: out of memory", __func__);
+ os_free(ctx);
return NULL;
}
@@ -3134,10 +3135,8 @@ ieee802_1x_kay_init(struct ieee802_1x_kay_ctx *ctx, enum macsec_policy policy,
dl_list_init(&kay->participant_list);
if (policy != DO_NOT_SECURE &&
- secy_get_capability(kay, &kay->macsec_capable) < 0) {
- os_free(kay);
- return NULL;
- }
+ secy_get_capability(kay, &kay->macsec_capable) < 0)
+ goto error;
if (policy == DO_NOT_SECURE ||
kay->macsec_capable == MACSEC_CAP_NOT_IMPLEMENTED) {
@@ -3164,16 +3163,17 @@ ieee802_1x_kay_init(struct ieee802_1x_kay_ctx *ctx, enum macsec_policy policy,
wpa_printf(MSG_DEBUG, "KaY: state machine created");
/* Initialize the SecY must be prio to CP, as CP will control SecY */
- secy_init_macsec(kay);
+ if (secy_init_macsec(kay) < 0) {
+ wpa_printf(MSG_DEBUG, "KaY: Could not initialize MACsec");
+ goto error;
+ }
wpa_printf(MSG_DEBUG, "KaY: secy init macsec done");
/* init CP */
kay->cp = ieee802_1x_cp_sm_init(kay);
- if (kay->cp == NULL) {
- ieee802_1x_kay_deinit(kay);
- return NULL;
- }
+ if (kay->cp == NULL)
+ goto error;
if (policy == DO_NOT_SECURE) {
ieee802_1x_cp_connect_authenticated(kay->cp);
@@ -3184,12 +3184,15 @@ ieee802_1x_kay_init(struct ieee802_1x_kay_ctx *ctx, enum macsec_policy policy,
if (kay->l2_mka == NULL) {
wpa_printf(MSG_WARNING,
"KaY: Failed to initialize L2 packet processing for MKA packet");
- ieee802_1x_kay_deinit(kay);
- return NULL;
+ goto error;
}
}
return kay;
+
+error:
+ ieee802_1x_kay_deinit(kay);
+ return NULL;
}
diff --git a/wpa_supplicant/wpas_kay.c b/wpa_supplicant/wpas_kay.c
index d087e00ad..587e5c3dd 100644
--- a/wpa_supplicant/wpas_kay.c
+++ b/wpa_supplicant/wpas_kay.c
@@ -235,10 +235,9 @@ int ieee802_1x_alloc_kay_sm(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid)
res = ieee802_1x_kay_init(kay_ctx, policy, ssid->macsec_port,
ssid->mka_priority, wpa_s->ifname,
wpa_s->own_addr);
- if (res == NULL) {
- os_free(kay_ctx);
+ /* ieee802_1x_kay_init() frees kay_ctx on failure */
+ if (res == NULL)
return -1;
- }
wpa_s->kay = res;
--
2.13.5