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-rw-r--r--main/hostapd/0014-EAP-pwd-server-Fix-reassembly-buffer-handling.patch45
1 files changed, 45 insertions, 0 deletions
diff --git a/main/hostapd/0014-EAP-pwd-server-Fix-reassembly-buffer-handling.patch b/main/hostapd/0014-EAP-pwd-server-Fix-reassembly-buffer-handling.patch
new file mode 100644
index 0000000000..620d67da02
--- /dev/null
+++ b/main/hostapd/0014-EAP-pwd-server-Fix-reassembly-buffer-handling.patch
@@ -0,0 +1,45 @@
+From fe76f487e28bdc61940f304f153a954cf36935ea Mon Sep 17 00:00:00 2001
+From: Jouni Malinen <jouni@codeaurora.org>
+Date: Wed, 17 Apr 2019 01:55:32 +0300
+Subject: [PATCH 1/3] EAP-pwd server: Fix reassembly buffer handling
+
+data->inbuf allocation might fail and if that were to happen, the next
+fragment in the exchange could have resulted in NULL pointer
+dereference. Unexpected fragment with more bit might also be able to
+trigger this. Fix that by explicitly checking for data->inbuf to be
+available before using it.
+
+Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
+---
+ src/eap_server/eap_server_pwd.c | 8 +++++++-
+ 1 file changed, 7 insertions(+), 1 deletion(-)
+
+diff --git a/src/eap_server/eap_server_pwd.c b/src/eap_server/eap_server_pwd.c
+index 11bef55..38e2af8 100644
+--- a/src/eap_server/eap_server_pwd.c
++++ b/src/eap_server/eap_server_pwd.c
+@@ -912,6 +912,12 @@ static void eap_pwd_process(struct eap_sm *sm, void *priv,
+ * the first and all intermediate fragments have the M bit set
+ */
+ if (EAP_PWD_GET_MORE_BIT(lm_exch) || data->in_frag_pos) {
++ if (!data->inbuf) {
++ wpa_printf(MSG_DEBUG,
++ "EAP-pwd: No buffer for reassembly");
++ eap_pwd_state(data, FAILURE);
++ return;
++ }
+ if ((data->in_frag_pos + len) > wpabuf_size(data->inbuf)) {
+ wpa_printf(MSG_DEBUG, "EAP-pwd: Buffer overflow "
+ "attack detected! (%d+%d > %d)",
+@@ -932,7 +938,7 @@ static void eap_pwd_process(struct eap_sm *sm, void *priv,
+ * last fragment won't have the M bit set (but we're obviously
+ * buffering fragments so that's how we know it's the last)
+ */
+- if (data->in_frag_pos) {
++ if (data->in_frag_pos && data->inbuf) {
+ pos = wpabuf_head_u8(data->inbuf);
+ len = data->in_frag_pos;
+ wpa_printf(MSG_DEBUG, "EAP-pwd: Last fragment, %d bytes",
+--
+2.7.4
+