From: Lv Yunlong <lyl2019@xxxxxxxxxxxxxxxx>
[ Upstream commit f973795a8d19cbf3d03807704eb7c6ff65788d5a ]
In iwl_txq_dyn_alloc_dma, txq->tfds is freed at first time by:
iwl_txq_alloc()->goto err_free_tfds->dma_free_coherent(). But
it forgot to set txq->tfds to NULL.
Then the txq->tfds is freed again in iwl_txq_dyn_alloc_dma by:
goto error->iwl_txq_gen2_free_memory()->dma_free_coherent().
My patch sets txq->tfds to NULL after the first free to avoid the
double free.
Fixes: 0cd1ad2d7fd41 ("iwlwifi: move all bus-independent TX functions to common code")
Signed-off-by: Lv Yunlong <lyl2019@xxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210403054755.4781-1-lyl2019@xxxxxxxxxxxxxxxx
Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/wireless/intel/iwlwifi/queue/tx.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/net/wireless/intel/iwlwifi/queue/tx.c b/drivers/net/wireless/intel/iwlwifi/queue/tx.c
index 9181221a2434d..0136df00ff6a6 100644
--- a/drivers/net/wireless/intel/iwlwifi/queue/tx.c
+++ b/drivers/net/wireless/intel/iwlwifi/queue/tx.c
@@ -1148,6 +1148,7 @@ int iwl_txq_alloc(struct iwl_trans *trans, struct iwl_txq *txq, int slots_num,
return 0;
err_free_tfds:
dma_free_coherent(trans->dev, tfd_sz, txq->tfds, txq->dma_addr);
+ txq->tfds = NULL;
error:
if (txq->entries && cmd_queue)
for (i = 0; i < slots_num; i++)
--
2.34.1
