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Message-Id: <20220720011031.1023305-29-sashal@kernel.org> Date: Tue, 19 Jul 2022 21:10:06 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Ryder Lee <ryder.lee@...iatek.com>, Johannes Berg <johannes.berg@...el.com>, Sasha Levin <sashal@...nel.org>, johannes@...solutions.net, davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, matthias.bgg@...il.com, linux-wireless@...r.kernel.org, netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org Subject: [PATCH AUTOSEL 5.18 29/54] wifi: mac80211: check skb_shared in ieee80211_8023_xmit() From: Ryder Lee <ryder.lee@...iatek.com> [ Upstream commit a4926abb787e2ef3ee2997e6ca8844d859478647 ] Add a missing skb_shared check into 802.3 path to prevent potential use-after-free from happening. This also uses skb_share_check() instead of open-coding in tx path. Signed-off-by: Ryder Lee <ryder.lee@...iatek.com> Link: https://lore.kernel.org/r/e7a73aaf7742b17e43421c56625646dfc5c4d2cb.1653571902.git.ryder.lee@mediatek.com Signed-off-by: Johannes Berg <johannes.berg@...el.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- net/mac80211/tx.c | 36 +++++++++++++----------------------- 1 file changed, 13 insertions(+), 23 deletions(-) diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index b6b20f38de0e..5166d8696f7e 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -2818,19 +2818,10 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, /* * If the skb is shared we need to obtain our own copy. */ - if (skb_shared(skb)) { - struct sk_buff *tmp_skb = skb; - - /* can't happen -- skb is a clone if info_id != 0 */ - WARN_ON(info_id); - - skb = skb_clone(skb, GFP_ATOMIC); - kfree_skb(tmp_skb); - - if (!skb) { - ret = -ENOMEM; - goto free; - } + skb = skb_share_check(skb, GFP_ATOMIC); + if (unlikely(!skb)) { + ret = -ENOMEM; + goto free; } hdr.frame_control = fc; @@ -3541,15 +3532,9 @@ static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, /* after this point (skb is modified) we cannot return false */ - if (skb_shared(skb)) { - struct sk_buff *tmp_skb = skb; - - skb = skb_clone(skb, GFP_ATOMIC); - kfree_skb(tmp_skb); - - if (!skb) - return true; - } + skb = skb_share_check(skb, GFP_ATOMIC); + if (unlikely(!skb)) + return true; if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) @@ -4439,7 +4424,7 @@ 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; @@ -4454,6 +4439,11 @@ static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) goto out_free; + skb = skb_share_check(skb, GFP_ATOMIC); + if (unlikely(!skb)) + return; + + info = IEEE80211_SKB_CB(skb); memset(info, 0, sizeof(*info)); ieee80211_aggr_check(sdata, sta, skb); -- 2.35.1
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