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Subject[PATCH 4.9 034/177] mwifiex: dont leak chan_stats on reset
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Brian Norris <briannorris@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 <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/wireless/marvell/mwifiex/main.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- 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 mwi

kfree(adapter->regd);

- vfree(adapter->chan_stats);
kfree(adapter);
return 0;
}
@@ -636,6 +635,7 @@ static void mwifiex_fw_dpc(const struct
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_adapt
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_a
mwifiex_del_virtual_intf(adapter->wiphy, &priv->wdev);
rtnl_unlock();
}
+ vfree(adapter->chan_stats);

wiphy_unregister(adapter->wiphy);
wiphy_free(adapter->wiphy);

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