| Message ID | 1ef9b892cc93a36b1e62a6dda0e2e0a019f4e5f7.1653555361.git.ryder.lee@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mac80211: check skb_shared in ieee80211_8023_xmit() | expand |
> 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@mediatek.com> > --- > 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; > + } I guess you can use skb_share_check() here instead. Regards, Lorenzo > + > + info = IEEE80211_SKB_CB(skb); > memset(info, 0, sizeof(*info)); > > ieee80211_aggr_check(sdata, sta, skb); > -- > 2.29.2 >
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);
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@mediatek.com> --- net/mac80211/tx.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)