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authorJiasheng Jiang <jiasheng@iscas.ac.cn>2022-01-05 11:15:59 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2022-02-23 14:03:10 +0300
commit00fb850c8a1a9893351ca52e56dc0bfc6ce20597 (patch)
treee0bac2a8d2d4fbcfbd343c749840fa828354e284
parent61e8fc49a9f8c9f26461222e9bb5fc6814eb27c9 (diff)
downloadlinux-00fb850c8a1a9893351ca52e56dc0bfc6ce20597.tar.xz
mac80211: mlme: check for null after calling kmemdup
commit a72c01a94f1d285a274219d36e2a17b4846c0615 upstream. As the possible failure of the alloc, the ifmgd->assoc_req_ies might be NULL pointer returned from kmemdup(). Therefore it might be better to free the skb and return error in order to fail the association, like ieee80211_assoc_success(). Also, the caller, ieee80211_do_assoc(), needs to deal with the return value from ieee80211_send_assoc(). Fixes: 4d9ec73d2b78 ("cfg80211: Report Association Request frame IEs in association events") Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn> Link: https://lore.kernel.org/r/20220105081559.2387083-1-jiasheng@iscas.ac.cn [fix some paths to be errors, not success] Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--net/mac80211/mlme.c29
1 files changed, 21 insertions, 8 deletions
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 89c648b035b9..215948fb0d35 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -664,7 +664,7 @@ static void ieee80211_add_he_ie(struct ieee80211_sub_if_data *sdata,
ieee80211_ie_build_he_6ghz_cap(sdata, skb);
}
-static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
+static int ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
@@ -684,6 +684,7 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
enum nl80211_iftype iftype = ieee80211_vif_type_p2p(&sdata->vif);
const struct ieee80211_sband_iftype_data *iftd;
struct ieee80211_prep_tx_info info = {};
+ int ret;
/* we know it's writable, cast away the const */
if (assoc_data->ie_len)
@@ -697,7 +698,7 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
if (WARN_ON(!chanctx_conf)) {
rcu_read_unlock();
- return;
+ return -EINVAL;
}
chan = chanctx_conf->def.chan;
rcu_read_unlock();
@@ -748,7 +749,7 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
(iftd ? iftd->vendor_elems.len : 0),
GFP_KERNEL);
if (!skb)
- return;
+ return -ENOMEM;
skb_reserve(skb, local->hw.extra_tx_headroom);
@@ -1029,15 +1030,22 @@ skip_rates:
skb_put_data(skb, assoc_data->ie + offset, noffset - offset);
}
- if (assoc_data->fils_kek_len &&
- fils_encrypt_assoc_req(skb, assoc_data) < 0) {
- dev_kfree_skb(skb);
- return;
+ if (assoc_data->fils_kek_len) {
+ ret = fils_encrypt_assoc_req(skb, assoc_data);
+ if (ret < 0) {
+ dev_kfree_skb(skb);
+ return ret;
+ }
}
pos = skb_tail_pointer(skb);
kfree(ifmgd->assoc_req_ies);
ifmgd->assoc_req_ies = kmemdup(ie_start, pos - ie_start, GFP_ATOMIC);
+ if (!ifmgd->assoc_req_ies) {
+ dev_kfree_skb(skb);
+ return -ENOMEM;
+ }
+
ifmgd->assoc_req_ies_len = pos - ie_start;
drv_mgd_prepare_tx(local, sdata, &info);
@@ -1047,6 +1055,8 @@ skip_rates:
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
IEEE80211_TX_INTFL_MLME_CONN_TX;
ieee80211_tx_skb(sdata, skb);
+
+ return 0;
}
void ieee80211_send_pspoll(struct ieee80211_local *local,
@@ -4451,6 +4461,7 @@ static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
struct ieee80211_local *local = sdata->local;
+ int ret;
sdata_assert_lock(sdata);
@@ -4471,7 +4482,9 @@ static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
sdata_info(sdata, "associate with %pM (try %d/%d)\n",
assoc_data->bss->bssid, assoc_data->tries,
IEEE80211_ASSOC_MAX_TRIES);
- ieee80211_send_assoc(sdata);
+ ret = ieee80211_send_assoc(sdata);
+ if (ret)
+ return ret;
if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;