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>
diff --git a/drivers/net/wireless/rt2x00/rt2800pci.c b/drivers/net/wireless/rt2x00/rt2800pci.c
index 72e4f29..db61a78 100644
--- a/drivers/net/wireless/rt2x00/rt2800pci.c
+++ b/drivers/net/wireless/rt2x00/rt2800pci.c
@@ -616,7 +616,7 @@
static void rt2800pci_write_tx_datadesc(struct queue_entry* entry,
struct txentry_desc *txdesc)
{
- rt2800_write_txwi(entry->skb, txdesc);
+ rt2800_write_txwi((__le32 *) entry->skb->data, txdesc);
}
@@ -693,15 +693,22 @@
rt2800_register_write(rt2x00dev, BCN_TIME_CFG, reg);
/*
+ * Add space for the TXWI in front of the skb.
+ */
+ skb_push(entry->skb, TXWI_DESC_SIZE);
+ memset(entry->skb, 0, TXWI_DESC_SIZE);
+
+ /*
* Register descriptor details in skb frame descriptor.
*/
- skbdesc->desc = entry->skb->data - TXWI_DESC_SIZE;
+ skbdesc->flags |= SKBDESC_DESC_IN_SKB;
+ skbdesc->desc = entry->skb->data;
skbdesc->desc_len = TXWI_DESC_SIZE;
/*
* Add the TXWI for the beacon to the skb.
*/
- rt2800_write_txwi(entry->skb, txdesc);
+ rt2800_write_txwi((__le32 *)entry->skb->data, txdesc);
/*
* Dump beacon to userspace through debugfs.
@@ -709,11 +716,6 @@
rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_BEACON, entry->skb);
/*
- * Adjust skb to take TXWI into account.
- */
- skb_push(entry->skb, TXWI_DESC_SIZE);
-
- /*
* Write entire beacon with TXWI to register.
*/
beacon_base = HW_BEACON_OFFSET(entry->entry_idx);
@@ -888,8 +890,7 @@
/* Check if we got a match by looking at WCID/ACK/PID
* fields */
- txwi = (__le32 *)(entry->skb->data -
- rt2x00dev->ops->extra_tx_headroom);
+ txwi = (__le32 *) entry->skb->data;
rt2x00_desc_read(txwi, 1, &word);
tx_wcid = rt2x00_get_field32(word, TXWI_W1_WIRELESS_CLI_ID);
@@ -934,7 +935,7 @@
__set_bit(TXDONE_FALLBACK, &txdesc.flags);
- rt2x00lib_txdone(entry, &txdesc);
+ rt2x00pci_txdone(entry, &txdesc);
}
}