Add missing skb_shared check into 802.3 path as 802.11 path does
to prevent potential use-after-free from happening.
Signed-off-by: Ryder Lee <ryder.lee@xxxxxxxxxxxx>
---
net/mac80211/tx.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 0e4efc08c762..b026e746ac5b 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -4437,7 +4437,7 @@ static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata,
struct net_device *dev, struct sta_info *sta,
struct ieee80211_key *key, struct sk_buff *skb)
{
- struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_tx_info *info;
struct ieee80211_local *local = sdata->local;
struct tid_ampdu_tx *tid_tx;
u8 tid;
@@ -4452,6 +4452,17 @@ static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata,
test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
goto out_free;
+ if (skb_shared(skb)) {
+ struct sk_buff *tmp_skb = skb;
+
+ skb = skb_clone(skb, GFP_ATOMIC);
+ kfree_skb(tmp_skb);
+
+ if (!skb)
+ return;
+ }
+
+ info = IEEE80211_SKB_CB(skb);
memset(info, 0, sizeof(*info));
ieee80211_aggr_check(sdata, sta, skb);
--
2.29.2
