[PATCH AUTOSEL for 4.9 051/190] mwifiex: don't leak 'chan_stats' on reset

[Sasha Levin]

From: Brian Norris <briannor...@chromium.org>

[ Upstream commit fb9e67bee3ab7111513130c516ffe378d885c0d0 ]

'chan_stats' is (re)allocated in _mwifiex_fw_dpc() ->
mwifiex_init_channel_scan_gap(), which is called whenever the device is
initialized -- at probe or at reset.

But we only free it in we completely unregister the adapter, meaning we
leak a copy of it during every reset.

Let's free it in the shutdown / removal paths instead (and in the
error-handling path), to avoid the leak.

Ideally, we can eventually unify much of mwifiex_shutdown_sw() and
mwifiex_remove_card() (way too much copy-and-paste) to reduce the burden
on bugfixes like this. But that's work for tomorrow.

Signed-off-by: Brian Norris <briannor...@chromium.org>
Signed-off-by: Kalle Valo <kv...@codeaurora.org>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
---
 drivers/net/wireless/marvell/mwifiex/main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/main.c 
b/drivers/net/wireless/marvell/mwifiex/main.c
index 2478ccd6f2d9..1e36f11831a9 100644
--- a/drivers/net/wireless/marvell/mwifiex/main.c
+++ b/drivers/net/wireless/marvell/mwifiex/main.c
@@ -146,7 +146,6 @@ static int mwifiex_unregister(struct mwifiex_adapter 
*adapter)
 
        kfree(adapter->regd);
 
-       vfree(adapter->chan_stats);
        kfree(adapter);
        return 0;
 }
@@ -636,6 +635,7 @@ static void mwifiex_fw_dpc(const struct firmware *firmware, 
void *context)
        goto done;
 
 err_add_intf:
+       vfree(adapter->chan_stats);
        wiphy_unregister(adapter->wiphy);
        wiphy_free(adapter->wiphy);
 err_init_fw:
@@ -1429,6 +1429,7 @@ mwifiex_shutdown_sw(struct mwifiex_adapter *adapter, 
struct semaphore *sem)
                        mwifiex_del_virtual_intf(adapter->wiphy, &priv->wdev);
                rtnl_unlock();
        }
+       vfree(adapter->chan_stats);
 
        up(sem);
 exit_sem_err:
@@ -1729,6 +1730,7 @@ int mwifiex_remove_card(struct mwifiex_adapter *adapter, 
struct semaphore *sem)
                        mwifiex_del_virtual_intf(adapter->wiphy, &priv->wdev);
                rtnl_unlock();
        }
+       vfree(adapter->chan_stats);
 
        wiphy_unregister(adapter->wiphy);
        wiphy_free(adapter->wiphy);
-- 
2.14.1