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cfg80211: fix proto in ieee80211_data_to_8023 for frames without LLC header

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The PDU length of incoming LLC frames is set to the total skb payload size
in __ieee80211_data_to_8023() of net/wireless/util.c which incorrectly
includes the length of the IEEE 802.11 header.

The resulting LLC frame header has a too large PDU length, causing the
llc_fixup_skb() function of net/llc/llc_input.c to reject the incoming
skb, effectively breaking STP.

Solve the problem by properly substracting the IEEE 802.11 frame header size
from the PDU length, allowing the LLC processor to pick up the incoming
control messages.

Special thanks to Gerry Rozema for tracking down the regression and proposing
a suitable patch.

Fixes: 2d1c304cb2 ("cfg80211: add function for 802.3 conversion with separate output buffer")
Cc: stable@vger.kernel.org
Reported-by: Gerry Rozema <gerryr@rozeware.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
This commit is contained in:
Felix Fietkau 2016-06-29 10:36:39 +02:00 committed by Johannes Berg
parent 126e755732
commit c041778c96
1 changed files with 1 additions and 1 deletions
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2
net/wireless/util.c
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@ -509,7 +509,7 @@ static int __ieee80211_data_to_8023(struct sk_buff *skb, struct ethhdr *ehdr,
* replace EtherType */
hdrlen += ETH_ALEN + 2;
else
tmp.h_proto = htons(skb->len);
tmp.h_proto = htons(skb->len - hdrlen);
pskb_pull(skb, hdrlen);