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[PATCH] hostap: Allocate enough tailroom for TKIP 

When hostap_tx_encrypt() tries to allocate enough headroom and
tailroom for ieee80211 encryption, it only makes enough room for the
"mpdu" phase of the operation, but forgets about the "msdu" phase.
(For TKIP, these two phases require, respectively, 4 and 8 bytes of
tailroom, per the "ieee80211_crypt_tkip" structure at the bottom of
net/ieee80211/ieee80211_crypt_tkip.c.)

Signed-off-by: Brandon Craig Rhodes <brandon@rhodesmill.org>
Signed-off-by: Jouni Malinen <j@w1.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Brandon Craig Rhodes 2007-05-28 09:38:46 -07:00 committed by John W. Linville
parent ef7ab2357b
commit d7ea3be56a
1 changed files with 8 additions and 5 deletions
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13
drivers/net/wireless/hostap/hostap_80211_tx.c
View File

@ -311,7 +311,7 @@ static struct sk_buff * hostap_tx_encrypt(struct sk_buff *skb,
local_info_t *local;
struct ieee80211_hdr_4addr *hdr;
u16 fc;
int hdr_len, res;
int prefix_len, postfix_len, hdr_len, res;
iface = netdev_priv(skb->dev);
local = iface->local;
@ -337,10 +337,13 @@ static struct sk_buff * hostap_tx_encrypt(struct sk_buff *skb,
if (skb == NULL)
return NULL;
if ((skb_headroom(skb) < crypt->ops->extra_mpdu_prefix_len ||
skb_tailroom(skb) < crypt->ops->extra_mpdu_postfix_len) &&
pskb_expand_head(skb, crypt->ops->extra_mpdu_prefix_len,
crypt->ops->extra_mpdu_postfix_len, GFP_ATOMIC)) {
prefix_len = crypt->ops->extra_mpdu_prefix_len +
crypt->ops->extra_msdu_prefix_len;
postfix_len = crypt->ops->extra_mpdu_postfix_len +
crypt->ops->extra_msdu_postfix_len;
if ((skb_headroom(skb) < prefix_len ||
skb_tailroom(skb) < postfix_len) &&
pskb_expand_head(skb, prefix_len, postfix_len, GFP_ATOMIC)) {
kfree_skb(skb);
return NULL;
}