rt2800usb: Added rx packet length validity check

On our system (ARM Cortex-M3 SOC running linux-2.6.33)
frequent crashes were observed in the rt2800usb module
because of the invalid length of the received packet (3392,
46920...). This patch adds the sanity check on the packet
legth. Also, changed WARNING to ERROR in rt2x00lib_rxdone()
so that the bad packet condition would be noticed.

The fix was tested on the latest compat-wireless-3.5.1-1-snpc.

Cc: stable@vger.kernel.org
Signed-off-by: Sergei Poselenov <sposelenov@emcraft.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/rt2x00/rt2800usb.c b/drivers/net/wireless/rt2x00/rt2800usb.c
index 52a32b5baea0791fcdb1db953b04081b6c352080..6b4226b716187ea037d2a1c84e012806649e8816 100644 (file)
--- a/drivers/net/wireless/rt2x00/rt2800usb.c
+++ b/drivers/net/wireless/rt2x00/rt2800usb.c
@@ -667,8 +667,16 @@ static void rt2800usb_fill_rxdone(struct queue_entry *entry,
        skb_pull(entry->skb, RXINFO_DESC_SIZE);
 
        /*
-        * FIXME: we need to check for rx_pkt_len validity
+        * Check for rx_pkt_len validity. Return if invalid, leaving
+        * rxdesc->size zeroed out by the upper level.
         */
+       if (unlikely(rx_pkt_len == 0 ||
+                       rx_pkt_len > entry->queue->data_size)) {
+               ERROR(entry->queue->rt2x00dev,
+                       "Bad frame size %d, forcing to 0\n", rx_pkt_len);
+               return;
+       }
+
        rxd = (__le32 *)(entry->skb->data + rx_pkt_len);
 
        /*

diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index a6b88bd4a1a57d7f904c75faa62c95ea219be029..3f07e36f462b384565884580170faf7c3be2f25f 100644 (file)
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -629,7 +629,7 @@ void rt2x00lib_rxdone(struct queue_entry *entry, gfp_t gfp)
         */
        if (unlikely(rxdesc.size == 0 ||
                     rxdesc.size > entry->queue->data_size)) {
-               WARNING(rt2x00dev, "Wrong frame size %d max %d.\n",
+               ERROR(rt2x00dev, "Wrong frame size %d max %d.\n",
                        rxdesc.size, entry->queue->data_size);
                dev_kfree_skb(entry->skb);
                goto renew_skb;