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authorLuciano Coelho <coelho@ti.com>2011-05-19 00:43:38 +0300
committerJohn W. Linville <linville@tuxdriver.com>2011-05-26 15:43:28 -0400
commit208c72f4fe44fe09577e7975ba0e7fa0278f3d03 (patch)
treef556afcda6931d1ad7d5ab41341a887c0b25f664 /net/wireless
parent21bc7af6e5e684b44725b20f679e701e38ceef15 (diff)
nl80211: fix check for valid SSID size in scan operations
In both trigger_scan and sched_scan operations, we were checking for the SSID length before assigning the value correctly. Since the memory was just kzalloc'ed, the check was always failing and SSID with over 32 characters were allowed to go through. This was causing a buffer overflow when copying the actual SSID to the proper place. This bug has been there since 2.6.29-rc4. Cc: stable@kernel.org Signed-off-by: Luciano Coelho <coelho@ti.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/wireless')
-rw-r--r--net/wireless/nl80211.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index ec83f413a7ed..88a565f130a5 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -3406,12 +3406,12 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
i = 0;
if (info->attrs[NL80211_ATTR_SCAN_SSIDS]) {
nla_for_each_nested(attr, info->attrs[NL80211_ATTR_SCAN_SSIDS], tmp) {
+ request->ssids[i].ssid_len = nla_len(attr);
if (request->ssids[i].ssid_len > IEEE80211_MAX_SSID_LEN) {
err = -EINVAL;
goto out_free;
}
memcpy(request->ssids[i].ssid, nla_data(attr), nla_len(attr));
- request->ssids[i].ssid_len = nla_len(attr);
i++;
}
}
@@ -3572,6 +3572,7 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
if (info->attrs[NL80211_ATTR_SCAN_SSIDS]) {
nla_for_each_nested(attr, info->attrs[NL80211_ATTR_SCAN_SSIDS],
tmp) {
+ request->ssids[i].ssid_len = nla_len(attr);
if (request->ssids[i].ssid_len >
IEEE80211_MAX_SSID_LEN) {
err = -EINVAL;
@@ -3579,7 +3580,6 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
}
memcpy(request->ssids[i].ssid, nla_data(attr),
nla_len(attr));
- request->ssids[i].ssid_len = nla_len(attr);
i++;
}
}