diff options
Diffstat (limited to 'main/wpa_supplicant/0004-EAP-pwd-server-Fix-Total-Length-parsing-for-fragment.patch')
| -rw-r--r-- | main/wpa_supplicant/0004-EAP-pwd-server-Fix-Total-Length-parsing-for-fragment.patch | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/main/wpa_supplicant/0004-EAP-pwd-server-Fix-Total-Length-parsing-for-fragment.patch b/main/wpa_supplicant/0004-EAP-pwd-server-Fix-Total-Length-parsing-for-fragment.patch new file mode 100644 index 000000000..7edef099e --- /dev/null +++ b/main/wpa_supplicant/0004-EAP-pwd-server-Fix-Total-Length-parsing-for-fragment.patch @@ -0,0 +1,50 @@ +From 3035cc2894e08319b905bd6561e8bddc8c2db9fa Mon Sep 17 00:00:00 2001 +From: Jouni Malinen <j@w1.fi> +Date: Sat, 2 May 2015 19:26:06 +0300 +Subject: [PATCH 4/5] EAP-pwd server: Fix Total-Length parsing for fragment + reassembly + +The remaining number of bytes in the message could be smaller than the +Total-Length field size, so the length needs to be explicitly checked +prior to reading the field and decrementing the len variable. This could +have resulted in the remaining length becoming negative and interpreted +as a huge positive integer. + +In addition, check that there is no already started fragment in progress +before allocating a new buffer for reassembling fragments. This avoid a +potential memory leak when processing invalid message. + +Signed-off-by: Jouni Malinen <j@w1.fi> +--- + src/eap_server/eap_server_pwd.c | 10 ++++++++++ + 1 file changed, 10 insertions(+) + +diff --git a/src/eap_server/eap_server_pwd.c b/src/eap_server/eap_server_pwd.c +index 3189105..2bfc3c2 100644 +--- a/src/eap_server/eap_server_pwd.c ++++ b/src/eap_server/eap_server_pwd.c +@@ -942,11 +942,21 @@ static void eap_pwd_process(struct eap_sm *sm, void *priv, + * the first fragment has a total length + */ + if (EAP_PWD_GET_LENGTH_BIT(lm_exch)) { ++ if (len < 2) { ++ wpa_printf(MSG_DEBUG, ++ "EAP-pwd: Frame too short to contain Total-Length field"); ++ return; ++ } + tot_len = WPA_GET_BE16(pos); + wpa_printf(MSG_DEBUG, "EAP-pwd: Incoming fragments, total " + "length = %d", tot_len); + if (tot_len > 15000) + return; ++ if (data->inbuf) { ++ wpa_printf(MSG_DEBUG, ++ "EAP-pwd: Unexpected new fragment start when previous fragment is still in use"); ++ return; ++ } + data->inbuf = wpabuf_alloc(tot_len); + if (data->inbuf == NULL) { + wpa_printf(MSG_INFO, "EAP-pwd: Out of memory to " +-- +1.9.1 + |