mwifiex: fix a crash in extended scan event processing

[113.967694] Unable to handle kernel NULL pointer dereference
               at virtual address 00000020
............
[113.967859] PC is at mwifiex_update_rxreor_flags+0xfc/0x430
............
[113.968110] mwifiex_update_rxreor_flags+0xfc/0x430
[113.968129] mwifiex_handle_event_ext_scan_report+0x1e4/0x21c
[113.968148] mwifiex_process_sta_event+0x410/0x508
[113.968165] mwifiex_process_event+0x184/0x1e0
[113.968181] mwifiex_main_process+0x220/0x48c
[113.968197] mwifiex_sdio_interrupt+0xc8/0x1cc
[113.968210] sdio_irq_thread+0x11c/0x290

In case of legacy scan, adapter->curr_cmd is guranteed to be
non-NULL in check_next_scan_cmd. This may not be case in
extended scan where scan command response would come earlier and
set curr_cmd to NULL. Extended scan event comes later and while
trying to complete IOCTL for scan, driver would crash in
dereferencing adapter->curr_cmd->wait_q_enabled.

Avoid this by completing IOCTL in case of legacy scans only.
Internal scan would be completed while handling extended scan
command response.

Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 19 insertions, 10 deletions

diff --git a/drivers/net/wireless/mwifiex/scan.c b/drivers/net/wireless/mwifiex/scan.c
index d75f4ebd4bdc..45c5b3450cf5 100644
--- a/drivers/net/wireless/mwifiex/scan.c
+++ b/drivers/net/wireless/mwifiex/scan.c
@@ -1738,6 +1738,19 @@ mwifiex_parse_single_response_buf(struct mwifiex_private *priv, u8 **bss_info,
         return 0;
 }
 
+static void mwifiex_complete_scan(struct mwifiex_private *priv)
+{
+        struct mwifiex_adapter *adapter = priv->adapter;
+
+        if (adapter->curr_cmd->wait_q_enabled) {
+                adapter->cmd_wait_q.status = 0;
+                if (!priv->scan_request) {
+                        dev_dbg(adapter->dev, "complete internal scan\n");
+                        mwifiex_complete_cmd(adapter, adapter->curr_cmd);
+                }
+        }
+}
+
 static void mwifiex_check_next_scan_command(struct mwifiex_private *priv)
 {
         struct mwifiex_adapter *adapter = priv->adapter;
@@ -1751,16 +1764,9 @@ static void mwifiex_check_next_scan_command(struct mwifiex_private *priv)
                 adapter->scan_processing = false;
                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
 
-                /* Need to indicate IOCTL complete */
-                if (adapter->curr_cmd->wait_q_enabled) {
-                        adapter->cmd_wait_q.status = 0;
-                        if (!priv->scan_request) {
-                                dev_dbg(adapter->dev,
-                                        "complete internal scan\n");
-                                mwifiex_complete_cmd(adapter,
-                                                     adapter->curr_cmd);
-                        }
-                }
+                if (!adapter->ext_scan)
+                        mwifiex_complete_scan(priv);
+
                 if (priv->report_scan_result)
                         priv->report_scan_result = false;
 
@@ -1965,6 +1971,9 @@ int mwifiex_cmd_802_11_scan_ext(struct mwifiex_private *priv,
 int mwifiex_ret_802_11_scan_ext(struct mwifiex_private *priv)
 {
         dev_dbg(priv->adapter->dev, "info: EXT scan returns successfully\n");
+
+        mwifiex_complete_scan(priv);
+
         return 0;
 }