linux-kernel - Re: [PATCH] dmaengine: idxd: fix possible wrong descriptor completion in llist_abort

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Message-ID: <b892c320-3138-4689-8a10-12e365961e63@intel.com>
Date: Tue, 6 Jan 2026 08:37:35 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: Tuo Li <islituo@...il.com>, vinicius.gomes@...el.com, vkoul@...nel.org
Cc: dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: idxd: fix possible wrong descriptor completion
 in llist_abort_desc()



On 1/5/26 8:24 PM, Tuo Li wrote:
> At the end of this function, d is the traversal cursor of flist, but the
> code completes found instead. This can lead to issues such as NULL pointer
> dereferences, double completion, or descriptor leaks.
> 
> Fix this by completing d instead of found in the final
> list_for_each_entry_safe() loop.
> 
> Fixes: aa8d18becc0c ("dmaengine: idxd: add callback support for iaa crypto")
> Signed-off-by: Tuo Li <islituo@...il.com>

Good catch! Thanks. 

Reviewed-by: Dave Jiang <dave.jiang@...el.com>

> ---
>  drivers/dma/idxd/submit.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/idxd/submit.c b/drivers/dma/idxd/submit.c
> index 6db1c5fcedc5..03217041b8b3 100644
> --- a/drivers/dma/idxd/submit.c
> +++ b/drivers/dma/idxd/submit.c
> @@ -138,7 +138,7 @@ static void llist_abort_desc(struct idxd_wq *wq, struct idxd_irq_entry *ie,
>  	 */
>  	list_for_each_entry_safe(d, t, &flist, list) {
>  		list_del_init(&d->list);
> -		idxd_dma_complete_txd(found, IDXD_COMPLETE_ABORT, true,
> +		idxd_dma_complete_txd(d, IDXD_COMPLETE_ABORT, true,
>  				      NULL, NULL);
>  	}
>  }