From 045cfb71a3901005bf6dcedae98cecb3360a0bfc Mon Sep 17 00:00:00 2001 From: Lennert Buytenhek Date: Thu, 7 Jan 2010 15:01:42 +0100 Subject: mac80211: fix queue selection for packets injected via monitor interface Commit 'mac80211: fix skb buffering issue' added an ->ndo_select_queue() for monitor interfaces which can end up dereferencing ieee802_1d_to_ac[] beyond the end of the array for injected data packets (as skb->priority isn't guaranteed to be zero or within [0:7]), which then triggers the WARN_ON in net/core/dev.c:dev_cap_txqueue(). Fix this by always setting the priority to zero on injected data frames. Signed-off-by: Lennert Buytenhek Cc: stable@kernel.org Signed-off-by: John W. Linville --- net/mac80211/iface.c | 1 + 1 file changed, 1 insertion(+) (limited to 'net/mac80211/iface.c') diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index ff762ed34f1..44188ef80a6 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -685,6 +685,7 @@ static u16 ieee80211_monitor_select_queue(struct net_device *dev, return ieee802_1d_to_ac[skb->priority]; } + skb->priority = 0; return ieee80211_downgrade_queue(local, skb); } -- cgit v1.2.3-70-g09d2 From b49bb574e44226b332c28439999d196ddec2f643 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 8 Jan 2010 19:00:00 +0100 Subject: mac80211: fix endian error I forgot to convert the radiotap length to CPU endian, which sparse found thankfully. Signed-off-by: Johannes Berg Cc: stable@kernel.org Signed-off-by: John W. Linville --- net/mac80211/iface.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'net/mac80211/iface.c') diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index 44188ef80a6..d62ec0803be 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -675,10 +675,10 @@ static u16 ieee80211_monitor_select_queue(struct net_device *dev, return 0; if (skb->len < 4 || - skb->len < rtap->it_len + 2 /* frame control */) + skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */) return 0; /* doesn't matter, frame will be dropped */ - hdr = (void *)((u8 *)skb->data + rtap->it_len); + hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); if (!ieee80211_is_data(hdr->frame_control)) { skb->priority = 7; -- cgit v1.2.3-70-g09d2 From 193e70ef65a6c33f2935ce1f4adeb08ecb9202cf Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Mon, 11 Jan 2010 06:47:00 +0100 Subject: mac80211: fix queue selection for data frames on monitor interfaces When ieee80211_monitor_select_queue encounters data frames, it selects the WMM AC based on skb->priority and assumes that skb->priority contains a valid 802.1d tag. However this assumption is incorrect, since ieee80211_select_queue has not been called at this point. If skb->priority > 7, an array overrun occurs, which could lead to invalid values, resulting in crashes in the tx path. Fix this by setting skb->priority based on the 802.11 header for QoS frames and using the default AC for all non-QoS frames. Signed-off-by: Felix Fietkau Signed-off-by: John W. Linville --- net/mac80211/iface.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'net/mac80211/iface.c') diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index d62ec0803be..32abae3ce32 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -670,6 +670,7 @@ static u16 ieee80211_monitor_select_queue(struct net_device *dev, struct ieee80211_local *local = sdata->local; struct ieee80211_hdr *hdr; struct ieee80211_radiotap_header *rtap = (void *)skb->data; + u8 *p; if (local->hw.queues < 4) return 0; @@ -680,12 +681,14 @@ static u16 ieee80211_monitor_select_queue(struct net_device *dev, hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len)); - if (!ieee80211_is_data(hdr->frame_control)) { + if (!ieee80211_is_data_qos(hdr->frame_control)) { skb->priority = 7; return ieee802_1d_to_ac[skb->priority]; } - skb->priority = 0; + p = ieee80211_get_qos_ctl(hdr); + skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK; + return ieee80211_downgrade_queue(local, skb); } -- cgit v1.2.3-70-g09d2