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[PATCH] ieee80211: fix not allocating IV+ICV space when usingencryption in ieee80211_tx_frame

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We should preallocate IV+ICV space when encrypting the frame.
Currently no problem shows up just because dev_alloc_skb aligns the
data len to SMP_CACHE_BYTES which can be used for ICV.

Signed-off-by: Hong Liu <hong.liu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Hong Liu 2006-06-21 11:35:08 +08:00 committed by Jeff Garzik
parent a1d79aaaa5
commit 4b30153669
1 changed files with 11 additions and 4 deletions
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15
net/ieee80211/ieee80211_tx.c
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@ -562,10 +562,13 @@ int ieee80211_tx_frame(struct ieee80211_device *ieee,
struct net_device_stats *stats = &ieee->stats;
struct sk_buff *skb_frag;
int priority = -1;
int fraglen = total_len;
int headroom = ieee->tx_headroom;
struct ieee80211_crypt_data *crypt = ieee->crypt[ieee->tx_keyidx];
spin_lock_irqsave(&ieee->lock, flags);
if (encrypt_mpdu && !ieee->sec.encrypt)
if (encrypt_mpdu && (!ieee->sec.encrypt || !crypt))
encrypt_mpdu = 0;
/* If there is no driver handler to take the TXB, dont' bother
@ -581,20 +584,24 @@ int ieee80211_tx_frame(struct ieee80211_device *ieee,
goto success;
}
if (encrypt_mpdu)
if (encrypt_mpdu) {
frame->frame_ctl |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
fraglen += crypt->ops->extra_mpdu_prefix_len +
crypt->ops->extra_mpdu_postfix_len;
headroom += crypt->ops->extra_mpdu_prefix_len;
}
/* When we allocate the TXB we allocate enough space for the reserve
* and full fragment bytes (bytes_per_frag doesn't include prefix,
* postfix, header, FCS, etc.) */
txb = ieee80211_alloc_txb(1, total_len, ieee->tx_headroom, GFP_ATOMIC);
txb = ieee80211_alloc_txb(1, fraglen, headroom, GFP_ATOMIC);
if (unlikely(!txb)) {
printk(KERN_WARNING "%s: Could not allocate TXB\n",
ieee->dev->name);
goto failed;
}
txb->encrypted = 0;
txb->payload_size = total_len;
txb->payload_size = fraglen;
skb_frag = txb->fragments[0];