diff options
| author | Gertjan van Wingerde <gwingerde@gmail.com> | 2010-06-03 10:51:45 +0200 |
|---|---|---|
| committer | Ivo van Doorn <IvDoorn@gmail.com> | 2010-06-03 10:51:45 +0200 |
| commit | 0b8004aa12d13ec750d102ba4082a95f0107c649 (patch) | |
| tree | eac5224159d34ae525b552254816c3a1e056336c /drivers/net/wireless/rt2x00/rt2500usb.c | |
| parent | rt2x00: Reverse calling order of bus write_tx_desc and driver write_tx_desc. (diff) | |
| download | linux-0b8004aa12d13ec750d102ba4082a95f0107c649.tar.xz linux-0b8004aa12d13ec750d102ba4082a95f0107c649.zip | |
rt2x00: Properly reserve room for descriptors in skbs.
Instead of fiddling with the skb->data pointer and thereby risking
out of bounds accesses, properly reserve the space needed in an
skb for descriptors.
Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2500usb.c')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2500usb.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c index d19f29a53523..9dab1dccdaff 100644 --- a/drivers/net/wireless/rt2x00/rt2500usb.c +++ b/drivers/net/wireless/rt2x00/rt2500usb.c @@ -1034,7 +1034,7 @@ static void rt2500usb_write_tx_desc(struct rt2x00_dev *rt2x00dev, struct txentry_desc *txdesc) { struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb); - __le32 *txd = (__le32 *)(skb->data - TXD_DESC_SIZE); + __le32 *txd = (__le32 *) skb->data; u32 word; /* @@ -1080,6 +1080,7 @@ static void rt2500usb_write_tx_desc(struct rt2x00_dev *rt2x00dev, /* * Register descriptor details in skb frame descriptor. */ + skbdesc->flags |= SKBDESC_DESC_IN_SKB; skbdesc->desc = txd; skbdesc->desc_len = TXD_DESC_SIZE; } @@ -1108,6 +1109,12 @@ static void rt2500usb_write_beacon(struct queue_entry *entry, rt2500usb_register_write(rt2x00dev, TXRX_CSR19, reg); /* + * Add space for the descriptor in front of the skb. + */ + skb_push(entry->skb, TXD_DESC_SIZE); + memset(entry->skb->data, 0, TXD_DESC_SIZE); + + /* * Write the TX descriptor for the beacon. */ rt2500usb_write_tx_desc(rt2x00dev, entry->skb, txdesc); @@ -1118,11 +1125,6 @@ static void rt2500usb_write_beacon(struct queue_entry *entry, rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_BEACON, entry->skb); /* - * Take the descriptor in front of the skb into account. - */ - skb_push(entry->skb, TXD_DESC_SIZE); - - /* * USB devices cannot blindly pass the skb->len as the * length of the data to usb_fill_bulk_urb. Pass the skb * to the driver to determine what the length should be. |