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nl80211: correctly validate S1G beacon head

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The S1G beacon has a different header size than regular
beacons, so adjust the beacon head validator.

Signed-off-by: Thomas Pedersen <thomas@adapt-ip.com>
Link: https://lore.kernel.org/r/20200908190323.15814-5-thomas@adapt-ip.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Thomas Pedersen 2020-09-08 12:03:05 -07:00 committed by Johannes Berg
parent 68dbad8c65
commit 1d47f1198d
2 changed files with 18 additions and 4 deletions
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17
net/wireless/nl80211.c
View file

@ -209,14 +209,23 @@ static int validate_beacon_head(const struct nlattr *attr,
unsigned int len = nla_len(attr);
const struct element *elem;
const struct ieee80211_mgmt *mgmt = (void *)data;
unsigned int fixedlen = offsetof(struct ieee80211_mgmt,
u.beacon.variable);
bool s1g_bcn = ieee80211_is_s1g_beacon(mgmt->frame_control);
unsigned int fixedlen, hdrlen;
if (s1g_bcn) {
fixedlen = offsetof(struct ieee80211_ext,
u.s1g_beacon.variable);
hdrlen = offsetof(struct ieee80211_ext, u.s1g_beacon);
} else {
fixedlen = offsetof(struct ieee80211_mgmt,
u.beacon.variable);
hdrlen = offsetof(struct ieee80211_mgmt, u.beacon);
}
if (len < fixedlen)
goto err;
if (ieee80211_hdrlen(mgmt->frame_control) !=
offsetof(struct ieee80211_mgmt, u.beacon))
if (ieee80211_hdrlen(mgmt->frame_control) != hdrlen)
goto err;
data += fixedlen;

5
net/wireless/util.c
View file

@ -399,6 +399,11 @@ unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
{
unsigned int hdrlen = 24;
if (ieee80211_is_ext(fc)) {
hdrlen = 4;
goto out;
}
if (ieee80211_is_data(fc)) {
if (ieee80211_has_a4(fc))
hdrlen = 30;