linux-kernel - Re: [PATCH] wireless: iwlwifi: Fix a double free in iwl_txq_dyn_alloc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <58a46153.42cc9.178cc10e136.Coremail.lyl2019@mail.ustc.edu.cn>
Date:   Wed, 14 Apr 2021 00:29:21 +0800 (GMT+08:00)
From:   lyl2019@...l.ustc.edu.cn
To:     "Lv Yunlong" <lyl2019@...l.ustc.edu.cn>
Cc:     luciano.coelho@...el.com, kvalo@...eaurora.org,
        davem@...emloft.net, kuba@...nel.org,
        mordechay.goodstein@...el.com, johannes.berg@...el.com,
        emmanuel.grumbach@...el.com, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] wireless: iwlwifi: Fix a double free in
 iwl_txq_dyn_alloc_dma


Hi, my dear maintainers.

     I'm very sorry to disturb you, that beacuse this patch has been not reviewed for one weeks.
     Could you help to review this patch? It will not cost you much time.

Sincerely.
  

> -----原始邮件-----
> 发件人: "Lv Yunlong" <lyl2019@...l.ustc.edu.cn>
> 发送时间: 2021-04-03 13:47:55 (星期六)
> 收件人: luciano.coelho@...el.com, kvalo@...eaurora.org, davem@...emloft.net, kuba@...nel.org, mordechay.goodstein@...el.com, johannes.berg@...el.com, emmanuel.grumbach@...el.com
> 抄送: linux-wireless@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, "Lv Yunlong" <lyl2019@...l.ustc.edu.cn>
> 主题: [PATCH] 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: 0cd1ad2d7fd41 ("iwlwifi: move all bus-independent TX functions to common code")
> Signed-off-by: Lv Yunlong <lyl2019@...l.ustc.edu.cn>
> ---
>  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 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++)
> -- 
> 2.25.1
>