From 0fe5a234240a108b294a87174ad197f6b5cb38e9 Mon Sep 17 00:00:00 2001
From: Paul Stewart <pstew@google.com>
Date: Thu, 3 Mar 2016 15:40:19 -0800
Subject: [PATCH 2/2] Remove newlines from wpa_supplicant config network
 output

Spurious newlines output while writing the config file can corrupt the
wpa_supplicant configuration. Avoid writing these for the network block
parameters. This is a generic filter that cover cases that may not have
been explicitly addressed with a more specific commit to avoid control
characters in the psk parameter.

Upstream-Status: Backport

CVE: CVE-2016-4476

Signed-off-by: Paul Stewart <pstew@google.com>
Signed-off-by: Zhixiong Chi <Zhixiong.Chi.wrs.com>
---
 src/utils/common.c      | 11 +++++++++++
 src/utils/common.h      |  1 +
 wpa_supplicant/config.c | 15 +++++++++++++--
 3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/src/utils/common.c b/src/utils/common.c
index 27b7c02..9856463 100644
--- a/src/utils/common.c
+++ b/src/utils/common.c
@@ -709,6 +709,17 @@ int has_ctrl_char(const u8 *data, size_t len)
 }
 
 
+int has_newline(const char *str)
+{
+	while (*str) {
+		if (*str == '\n' || *str == '\r')
+			return 1;
+		str++;
+	}
+	return 0;
+}
+
+
 size_t merge_byte_arrays(u8 *res, size_t res_len,
 			 const u8 *src1, size_t src1_len,
 			 const u8 *src2, size_t src2_len)
diff --git a/src/utils/common.h b/src/utils/common.h
index a972240..d19927b 100644
--- a/src/utils/common.h
+++ b/src/utils/common.h
@@ -489,6 +489,7 @@ const char * wpa_ssid_txt(const u8 *ssid, size_t ssid_len);
 char * wpa_config_parse_string(const char *value, size_t *len);
 int is_hex(const u8 *data, size_t len);
 int has_ctrl_char(const u8 *data, size_t len);
+int has_newline(const char *str);
 size_t merge_byte_arrays(u8 *res, size_t res_len,
 			 const u8 *src1, size_t src1_len,
 			 const u8 *src2, size_t src2_len);
diff --git a/wpa_supplicant/config.c b/wpa_supplicant/config.c
index fdd9643..eb97cd5 100644
--- a/wpa_supplicant/config.c
+++ b/wpa_supplicant/config.c
@@ -2699,8 +2699,19 @@ char * wpa_config_get(struct wpa_ssid *ssid, const char *var)
 
 	for (i = 0; i < NUM_SSID_FIELDS; i++) {
 		const struct parse_data *field = &ssid_fields[i];
-		if (os_strcmp(var, field->name) == 0)
-			return field->writer(field, ssid);
+		if (os_strcmp(var, field->name) == 0) {
+			char *ret = field->writer(field, ssid);
+
+			if (ret && has_newline(ret)) {
+				wpa_printf(MSG_ERROR,
+					   "Found newline in value for %s; not returning it",
+					   var);
+				os_free(ret);
+				ret = NULL;
+			}
+
+			return ret;
+		}
 	}
 
 	return NULL;
--
1.9.1
