From: Avinash Patil <[email protected]>
While sending null packet from driver we are passing NULL
tx_param pointer to indicate there are no more packets in queue.
PCIe send routine assumes caller has done sanity check on
tx_param and may cause crash while dereferencing next_pkt_len
from tx_param.
Avoid this by passing tx_param structure with next_pkt_len as
zero instead of NULL pointer.
Signed-off-by: Avinash Patil <[email protected]>
Signed-off-by: Bing Zhao <[email protected]>
---
drivers/net/wireless/mwifiex/pcie.c | 1 +
drivers/net/wireless/mwifiex/sta_tx.c | 4 +++-
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/mwifiex/pcie.c b/drivers/net/wireless/mwifiex/pcie.c
index c2cfeec..574d4b5 100644
--- a/drivers/net/wireless/mwifiex/pcie.c
+++ b/drivers/net/wireless/mwifiex/pcie.c
@@ -1071,6 +1071,7 @@ static int mwifiex_pcie_send_data_complete(struct mwifiex_adapter *adapter)
* is mapped to PCI device memory. Tx ring pointers are advanced accordingly.
* Download ready interrupt to FW is deffered if Tx ring is not full and
* additional payload can be accomodated.
+ * Caller must ensure tx_param parameter to this function is not NULL.
*/
static int
mwifiex_pcie_send_data(struct mwifiex_adapter *adapter, struct sk_buff *skb,
diff --git a/drivers/net/wireless/mwifiex/sta_tx.c b/drivers/net/wireless/mwifiex/sta_tx.c
index 1236a5d..5fce7e7 100644
--- a/drivers/net/wireless/mwifiex/sta_tx.c
+++ b/drivers/net/wireless/mwifiex/sta_tx.c
@@ -128,6 +128,7 @@ int mwifiex_send_null_packet(struct mwifiex_private *priv, u8 flags)
{
struct mwifiex_adapter *adapter = priv->adapter;
struct txpd *local_tx_pd;
+ struct mwifiex_tx_param tx_param;
/* sizeof(struct txpd) + Interface specific header */
#define NULL_PACKET_HDR 64
u32 data_len = NULL_PACKET_HDR;
@@ -168,8 +169,9 @@ int mwifiex_send_null_packet(struct mwifiex_private *priv, u8 flags)
skb, NULL);
} else {
skb_push(skb, INTF_HEADER_LEN);
+ tx_param.next_pkt_len = 0;
ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
- skb, NULL);
+ skb, &tx_param);
}
switch (ret) {
case -EBUSY:
--
1.8.2.3