iwlwifi: fix use after free bug for paged rx

In the paged rx patch (4854fde2), I introduced a bug that could possibly
touch an already freed page. It is fixed by avoiding the access in this
patch. I've also added some comments so that other people touching the
code won't make the same mistake. In the future, if we cannot avoid
access the page after being handled to the upper layer, we can use
get_page/put_page to handle it. For now, it's just not necessary.

It also fixed a debug message print bug reported by Stanislaw Gruszka
<sgruszka@redhat.com>.

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 13 insertions, 5 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c
index 5977a57a234c..8b08bdc10bc9 100644
--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c
@@ -1124,6 +1124,7 @@ static void iwl3945_rx_allocate(struct iwl_priv *priv, gfp_t priority)
         struct iwl_rx_mem_buffer *rxb;
         struct page *page;
         unsigned long flags;
+        gfp_t gfp_mask = priority;
 
         while (1) {
                 spin_lock_irqsave(&rxq->lock, flags);
@@ -1135,13 +1136,13 @@ static void iwl3945_rx_allocate(struct iwl_priv *priv, gfp_t priority)
                 spin_unlock_irqrestore(&rxq->lock, flags);
 
                 if (rxq->free_count > RX_LOW_WATERMARK)
-                        priority |= __GFP_NOWARN;
+                        gfp_mask |= __GFP_NOWARN;
 
                 if (priv->hw_params.rx_page_order > 0)
-                        priority |= __GFP_COMP;
+                        gfp_mask |= __GFP_COMP;
 
                 /* Alloc a new receive buffer */
-                page = alloc_pages(priority, priv->hw_params.rx_page_order);
+                page = alloc_pages(gfp_mask, priv->hw_params.rx_page_order);
                 if (!page) {
                         if (net_ratelimit())
                                 IWL_DEBUG_INFO(priv, "Failed to allocate SKB buffer.\n");
@@ -1410,8 +1411,8 @@ static void iwl3945_rx_handle(struct iwl_priv *priv)
                 if (priv->rx_handlers[pkt->hdr.cmd]) {
                         IWL_DEBUG_RX(priv, "r = %d, i = %d, %s, 0x%02x\n", r, i,
                                 get_cmd_string(pkt->hdr.cmd), pkt->hdr.cmd);
-                        priv->rx_handlers[pkt->hdr.cmd] (priv, rxb);
                         priv->isr_stats.rx_handlers[pkt->hdr.cmd]++;
+                        priv->rx_handlers[pkt->hdr.cmd] (priv, rxb);
                 } else {
                         /* No handling needed */
                         IWL_DEBUG_RX(priv,
@@ -1420,11 +1421,18 @@ static void iwl3945_rx_handle(struct iwl_priv *priv)
                                 pkt->hdr.cmd);
                 }
 
+                /*
+                 * XXX: After here, we should always check rxb->page
+                 * against NULL before touching it or its virtual
+                 * memory (pkt). Because some rx_handler might have
+                 * already taken or freed the pages.
+                 */
+
                 if (reclaim) {
                         /* Invoke any callbacks, transfer the buffer to caller,
                          * and fire off the (possibly) blocking iwl_send_cmd()
                          * as we reclaim the driver command queue */
-                        if (rxb && rxb->page)
+                        if (rxb->page)
                                 iwl_tx_cmd_complete(priv, rxb);
                         else
                                 IWL_WARN(priv, "Claim null rxb?\n");