mwl8k: Fix a double Free in mwl8k_probe_hw

[ Upstream commit a8e083ee8e2a6c94c29733835adae8bf5b832748 ]

In mwl8k_probe_hw, hw->priv->txq is freed at the first time by
dma_free_coherent() in the call chain:
if(!priv->ap_fw)->mwl8k_init_txqs(hw)->mwl8k_txq_init(hw, i).

Then in err_free_queues of mwl8k_probe_hw, hw->priv->txq is freed
at the second time by mwl8k_txq_deinit(hw, i)->dma_free_coherent().

My patch set txq->txd to NULL after the first free to avoid the
double free.

Fixes: a66098daacee2 ("mwl8k: Marvell TOPDOG wireless driver")
Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210402182627.4256-1-lyl2019@mail.ustc.edu.cn
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/wireless/marvell/mwl8k.c b/drivers/net/wireless/marvell/mwl8k.c
index 23efd70..27b7d4b 100644 (file)
--- a/drivers/net/wireless/marvell/mwl8k.c
+++ b/drivers/net/wireless/marvell/mwl8k.c
@@ -1469,6 +1469,7 @@ static int mwl8k_txq_init(struct ieee80211_hw *hw, int index)
        txq->skb = kcalloc(MWL8K_TX_DESCS, sizeof(*txq->skb), GFP_KERNEL);
        if (txq->skb == NULL) {
                pci_free_consistent(priv->pdev, size, txq->txd, txq->txd_dma);
+               txq->txd = NULL;
                return -ENOMEM;
        }