From 11f16aefcc07178972f149f1a1d53e6868481394 Mon Sep 17 00:00:00 2001 From: Ismael Luceno Date: Mon, 27 Dec 2010 15:06:17 +0100 Subject: [PATCH] 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 Signed-off-by: Ivo van Doorn Signed-off-by: John W. Linville --- drivers/net/wireless/rt2x00/rt2800usb.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/rt2x00/rt2800usb.c b/drivers/net/wireless/rt2x00/rt2800usb.c index 3e0205ddf7b4..b97a4a54ff4c 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; } /* -- 2.20.1