提交 f973795a 编写于 作者: L Lv Yunlong 提交者: Luca Coelho

wireless: iwlwifi: Fix a double free in iwl_txq_dyn_alloc_dma

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: 0cd1ad2d ("iwlwifi: move all bus-independent TX functions to common code")
Signed-off-by: NLv Yunlong <lyl2019@mail.ustc.edu.cn>
Link: https://lore.kernel.org/r/20210403054755.4781-1-lyl2019@mail.ustc.edu.cnSigned-off-by: NLuca Coelho <luciano.coelho@intel.com>
上级 46c7b05a
......@@ -1072,6 +1072,7 @@ 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++)
......
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