diff options
| author | Jeongik Cha <jeongik@google.com> | 2022-07-04 11:43:54 +0300 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2022-07-11 11:22:02 +0300 |
| commit | 4ee186fa7e40ae06ebbfbad77e249e3746e14114 (patch) | |
| tree | 66b1702d07769591234a775bb8a80af4d98eb7eb /drivers/net/wireless/mac80211_hwsim.c | |
| parent | 37babce9127f3145366a8f36334f24afa9a5d196 (diff) | |
| download | linux-4ee186fa7e40ae06ebbfbad77e249e3746e14114.tar.xz | |
wifi: mac80211_hwsim: fix race condition in pending packet
A pending packet uses a cookie as an unique key, but it can be duplicated
because it didn't use atomic operators.
And also, a pending packet can be null in hwsim_tx_info_frame_received_nl
due to race condition with mac80211_hwsim_stop.
For this,
* Use an atomic type and operator for a cookie
* Add a lock around the loop for pending packets
Signed-off-by: Jeongik Cha <jeongik@google.com>
Link: https://lore.kernel.org/r/20220704084354.3556326-1-jeongik@google.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'drivers/net/wireless/mac80211_hwsim.c')
| -rw-r--r-- | drivers/net/wireless/mac80211_hwsim.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c index c5bb97b381cf..ea006248ffcd 100644 --- a/drivers/net/wireless/mac80211_hwsim.c +++ b/drivers/net/wireless/mac80211_hwsim.c @@ -687,7 +687,7 @@ struct mac80211_hwsim_data { bool ps_poll_pending; struct dentry *debugfs; - uintptr_t pending_cookie; + atomic64_t pending_cookie; struct sk_buff_head pending; /* packets pending */ /* * Only radios in the same group can communicate together (the @@ -1358,7 +1358,7 @@ static void mac80211_hwsim_tx_frame_nl(struct ieee80211_hw *hw, int i; struct hwsim_tx_rate tx_attempts[IEEE80211_TX_MAX_RATES]; struct hwsim_tx_rate_flag tx_attempts_flags[IEEE80211_TX_MAX_RATES]; - uintptr_t cookie; + u64 cookie; if (data->ps != PS_DISABLED) hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM); @@ -1427,8 +1427,7 @@ static void mac80211_hwsim_tx_frame_nl(struct ieee80211_hw *hw, goto nla_put_failure; /* We create a cookie to identify this skb */ - data->pending_cookie++; - cookie = data->pending_cookie; + cookie = (u64)atomic64_inc_return(&data->pending_cookie); info->rate_driver_data[0] = (void *)cookie; if (nla_put_u64_64bit(skb, HWSIM_ATTR_COOKIE, cookie, HWSIM_ATTR_PAD)) goto nla_put_failure; @@ -4178,6 +4177,7 @@ static int hwsim_tx_info_frame_received_nl(struct sk_buff *skb_2, const u8 *src; unsigned int hwsim_flags; int i; + unsigned long flags; bool found = false; if (!info->attrs[HWSIM_ATTR_ADDR_TRANSMITTER] || @@ -4205,18 +4205,20 @@ static int hwsim_tx_info_frame_received_nl(struct sk_buff *skb_2, } /* look for the skb matching the cookie passed back from user */ + spin_lock_irqsave(&data2->pending.lock, flags); skb_queue_walk_safe(&data2->pending, skb, tmp) { u64 skb_cookie; txi = IEEE80211_SKB_CB(skb); - skb_cookie = (u64)(uintptr_t)txi->rate_driver_data[0]; + skb_cookie = (u64)txi->rate_driver_data[0]; if (skb_cookie == ret_skb_cookie) { - skb_unlink(skb, &data2->pending); + __skb_unlink(skb, &data2->pending); found = true; break; } } + spin_unlock_irqrestore(&data2->pending.lock, flags); /* not found */ if (!found) |