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[PATCH] ieee80211: Fix kernel panic when QoS is enabled

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The 802.11 header length is affected by the wireless mode (WDS or not) and
type (QoS or not). We should use the variable hdr_len instead of the
hard coded IEEE80211_3ADDR_LEN, otherwise we may touch invalid memory.

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Zhu Yi 2006-11-13 11:32:50 +08:00 committed by John W. Linville
parent 0579e30355
commit efa53ebe0d
1 changed files with 2 additions and 2 deletions
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4
net/ieee80211/ieee80211_tx.c
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@ -390,7 +390,7 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
* this stack is providing the full 802.11 header, one will
* eventually be affixed to this fragment -- so we must account
* for it when determining the amount of payload space. */
bytes_per_frag = frag_size - IEEE80211_3ADDR_LEN;
bytes_per_frag = frag_size - hdr_len;
if (ieee->config &
(CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))
bytes_per_frag -= IEEE80211_FCS_LEN;
@ -412,7 +412,7 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
} else {
nr_frags = 1;
bytes_per_frag = bytes_last_frag = bytes;
frag_size = bytes + IEEE80211_3ADDR_LEN;
frag_size = bytes + hdr_len;
}
rts_required = (frag_size > ieee->rts