From 0fe5a234240a108b294a87174ad197f6b5cb38e9 Mon Sep 17 00:00:00 2001 From: Paul Stewart Date: Thu, 3 Mar 2016 15:40:19 -0800 Subject: [PATCH] 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. Signed-off-by: Paul Stewart Signed-off-by: Baruch Siach --- Patch status: upstream (0fe5a234240a108b294a87174ad197f6b5cb38e9) 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 27b7c02de10b..9856463242c7 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 a97224070385..d19927b375bf 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 fdd964356afa..eb97cd5e4e6e 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; -- 2.8.1