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authorSara Sharon <sara.sharon@intel.com>2019-01-29 14:00:58 +0200
committerJohannes Berg <johannes.berg@intel.com>2019-02-08 13:56:37 +0100
commitc17fe043a3b79255c6cbe76aafb594849fac0005 (patch)
tree70e7834e2bbadfa4b489e8522101dacfe3137a20 /net/wireless
parentcaf56338c22f00098bf2acd646b0ddc691c80c24 (diff)
downloadlinux-c17fe043a3b79255c6cbe76aafb594849fac0005.tar.bz2
cfg80211: fix the IE inheritance of extension IEs
Extension IEs have ID 255 followed by extension ID. Current code is buggy in handling it in two ways: 1. When checking if IE is in the frame, it uses just the ID, which for extension elements is too broad. 2. It uses 0xFF to mark copied IEs, which will result in not copying extension IEs from the subelement. Fix both issue. Signed-off-by: Sara Sharon <sara.sharon@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless')
-rw-r--r--net/wireless/scan.c20
1 files changed, 13 insertions, 7 deletions
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 387e5f868684..46ecb10e85fb 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -216,7 +216,13 @@ static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
continue;
}
- tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy, subie_len);
+ if (tmp_old[0] == WLAN_EID_EXTENSION)
+ tmp = (u8 *)cfg80211_find_ext_ie(tmp_old[2], sub_copy,
+ subie_len);
+ else
+ tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy,
+ subie_len);
+
if (!tmp) {
/* ie in old ie but not in subelement */
if (tmp_old[0] != WLAN_EID_MULTIPLE_BSSID) {
@@ -226,8 +232,9 @@ static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
} else {
/* ie in transmitting ie also in subelement,
* copy from subelement and flag the ie in subelement
- * as copied (by setting eid field to 0xff). For
- * vendor ie, compare OUI + type + subType to
+ * as copied (by setting eid field to WLAN_EID_SSID,
+ * which is skipped anyway).
+ * For vendor ie, compare OUI + type + subType to
* determine if they are the same ie.
*/
if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) {
@@ -237,7 +244,7 @@ static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
*/
memcpy(pos, tmp, tmp[1] + 2);
pos += tmp[1] + 2;
- tmp[0] = 0xff;
+ tmp[0] = WLAN_EID_SSID;
} else {
memcpy(pos, tmp_old, tmp_old[1] + 2);
pos += tmp_old[1] + 2;
@@ -246,7 +253,7 @@ static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
/* copy ie from subelement into new ie */
memcpy(pos, tmp, tmp[1] + 2);
pos += tmp[1] + 2;
- tmp[0] = 0xff;
+ tmp[0] = WLAN_EID_SSID;
}
}
@@ -263,8 +270,7 @@ static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) {
if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP ||
tmp_new[0] == WLAN_EID_SSID ||
- tmp_new[0] == WLAN_EID_MULTI_BSSID_IDX ||
- tmp_new[0] == 0xff)) {
+ tmp_new[0] == WLAN_EID_MULTI_BSSID_IDX)) {
memcpy(pos, tmp_new, tmp_new[1] + 2);
pos += tmp_new[1] + 2;
}