| Message ID | 20210403054755.4781-1-lyl2019@mail.ustc.edu.cn |
|---|---|
| State | New |
| Headers | show |
| Series | wireless: iwlwifi: Fix a double free in iwl_txq_dyn_alloc_dma | expand |
diff --git a/drivers/net/wireless/intel/iwlwifi/queue/tx.c b/drivers/net/wireless/intel/iwlwifi/queue/tx.c index 833f43d1ca7a..99c8e473031a 100644 --- a/drivers/net/wireless/intel/iwlwifi/queue/tx.c +++ b/drivers/net/wireless/intel/iwlwifi/queue/tx.c @@ -1101,6 +1101,7 @@ 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++)
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@mail.ustc.edu.cn> --- drivers/net/wireless/intel/iwlwifi/queue/tx.c | 1 + 1 file changed, 1 insertion(+)