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authorAmitkumar Karwar <akarwar@marvell.com>2016-09-28 18:18:23 +0530
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-12-01 09:44:24 +0100
commitc8144277c0ad48c5633e91f979874632a0032084 (patch)
treea37e1b45126d35819b5bef8e0b31d3ded157f216 /drivers/net
parentc34774ea1bc322560d401e55f5cc1438c2c3cf30 (diff)
mwifiex: Fix NULL pointer dereference in skb_dequeue()
commit c44c040300d7afd79294710313a4989683e2afb1 upstream. At couple of places in cleanup path, we are just going through the skb queue and freeing them without unlinking. This leads to a crash when other thread tries to do skb_dequeue() and use already freed node. The problem is freed by unlinking skb before freeing it. Signed-off-by: Amitkumar Karwar <akarwar@marvell.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Signed-off-by: Amit Pundir <amit.pundir@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/wireless/marvell/mwifiex/cfg80211.c4
-rw-r--r--drivers/net/wireless/marvell/mwifiex/wmm.c12
2 files changed, 12 insertions, 4 deletions
diff --git a/drivers/net/wireless/marvell/mwifiex/cfg80211.c b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
index 48d51be11f9b..2054948050e2 100644
--- a/drivers/net/wireless/marvell/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
@@ -3079,8 +3079,10 @@ int mwifiex_del_virtual_intf(struct wiphy *wiphy, struct wireless_dev *wdev)
mwifiex_stop_net_dev_queue(priv->netdev, adapter);
- skb_queue_walk_safe(&priv->bypass_txq, skb, tmp)
+ skb_queue_walk_safe(&priv->bypass_txq, skb, tmp) {
+ skb_unlink(skb, &priv->bypass_txq);
mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
+ }
if (netif_carrier_ok(priv->netdev))
netif_carrier_off(priv->netdev);
diff --git a/drivers/net/wireless/marvell/mwifiex/wmm.c b/drivers/net/wireless/marvell/mwifiex/wmm.c
index 0eb246502e1d..dea2fe671dfe 100644
--- a/drivers/net/wireless/marvell/mwifiex/wmm.c
+++ b/drivers/net/wireless/marvell/mwifiex/wmm.c
@@ -503,8 +503,10 @@ mwifiex_wmm_del_pkts_in_ralist_node(struct mwifiex_private *priv,
struct mwifiex_adapter *adapter = priv->adapter;
struct sk_buff *skb, *tmp;
- skb_queue_walk_safe(&ra_list->skb_head, skb, tmp)
+ skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) {
+ skb_unlink(skb, &ra_list->skb_head);
mwifiex_write_data_complete(adapter, skb, 0, -1);
+ }
}
/*
@@ -600,11 +602,15 @@ mwifiex_clean_txrx(struct mwifiex_private *priv)
priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
- skb_queue_walk_safe(&priv->tdls_txq, skb, tmp)
+ skb_queue_walk_safe(&priv->tdls_txq, skb, tmp) {
+ skb_unlink(skb, &priv->tdls_txq);
mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
+ }
- skb_queue_walk_safe(&priv->bypass_txq, skb, tmp)
+ skb_queue_walk_safe(&priv->bypass_txq, skb, tmp) {
+ skb_unlink(skb, &priv->bypass_txq);
mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
+ }
atomic_set(&priv->adapter->bypass_tx_pending, 0);
idr_for_each(&priv->ack_status_frames, mwifiex_free_ack_frame, NULL);