Set tx_buffer to NULL not to free again the memory that is already freed,
which could cause system crash when device is failed.

Signed-off-by: Glen Lee <[email protected]>
---
 drivers/staging/wilc1000/wilc_wlan.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/wilc1000/wilc_wlan.c 
b/drivers/staging/wilc1000/wilc_wlan.c
index 00f3464..83af51b 100644
--- a/drivers/staging/wilc1000/wilc_wlan.c
+++ b/drivers/staging/wilc1000/wilc_wlan.c
@@ -1374,6 +1374,7 @@ void wilc_wlan_cleanup(struct net_device *dev)
        kfree(wilc->rx_buffer);
        wilc->rx_buffer = NULL;
        kfree(wilc->tx_buffer);
+       wilc->tx_buffer = NULL;
 
        acquire_bus(wilc, ACQUIRE_AND_WAKEUP);
 
-- 
1.9.1

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