diff options
| author | Ismael Luceno <ismael.luceno@gmail.com> | 2010-12-27 15:06:17 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2011-01-04 14:35:14 -0500 |
| commit | 11f16aefcc07178972f149f1a1d53e6868481394 (patch) | |
| tree | 33944c9e2886172b0a31844473373cdc1ebe607e /drivers/net | |
| parent | 736e3acadce8438e610b897af2b1c472ed58444b (diff) | |
rt2x00: Fix panic on frame padding for rt2800 usb devices
Backtrace:
rt2800usb_write_tx_data
rt2x00queue_write_tx_frame
rt2x00mac_tx
invoke_tx_handlers
__ieee80211_tx
ieee80211_tx
virt_to_head_page
ieee80211_xmit
ieee80211_tx_skb
ieee80211_scan_work
schedule
ieee80211_scan_work
process_one_work
...
It tried to expand the skb past it's end using skb_put. So I replaced it
with a call to skb_padto, which takes the issue into account.
Signed-off-by: Ismael Luceno <ismael.luceno@gmail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2800usb.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2800usb.c b/drivers/net/wireless/rt2x00/rt2800usb.c index 3e0205ddf7b..b97a4a54ff4 100644 --- a/drivers/net/wireless/rt2x00/rt2800usb.c +++ b/drivers/net/wireless/rt2x00/rt2800usb.c @@ -369,7 +369,10 @@ static void rt2800usb_write_tx_desc(struct queue_entry *entry, static void rt2800usb_write_tx_data(struct queue_entry *entry, struct txentry_desc *txdesc) { - u8 padding_len; + unsigned int len; + int err; + + rt2800_write_tx_data(entry, txdesc); /* * pad(1~3 bytes) is added after each 802.11 payload. @@ -378,9 +381,14 @@ static void rt2800usb_write_tx_data(struct queue_entry *entry, * | TXINFO | TXWI | 802.11 header | L2 pad | payload | pad | USB end pad | * |<------------- tx_pkt_len ------------->| */ - rt2800_write_tx_data(entry, txdesc); - padding_len = roundup(entry->skb->len + 4, 4) - entry->skb->len; - memset(skb_put(entry->skb, padding_len), 0, padding_len); + len = roundup(entry->skb->len, 4) + 4; + err = skb_padto(entry->skb, len); + if (unlikely(err)) { + WARNING(entry->queue->rt2x00dev, "TX SKB padding error, out of memory\n"); + return; + } + + entry->skb->len = len; } /* |