Re: [PATCH][v3] dmaengine: idxd: Fix possible Use-After-Free in irq_process_work_list

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On 5/29/24 10:48 PM, Li RongQing wrote:
> list_for_each_entry_safe() should be used when the descriptor will be
> freed in idxd_desc_complete(), Otherwise the freed descriptor will be
> dereferenced to get its next, and always deletes freed descriptor from
> list firstly

Maybe say it like this:

Use list_for_each_entry_safe() to allow iterating through the list and deleting the entry
in the iteration process. The descrptor is freed via idxd_desc_complete() and there's a
slight chance may cause issue for the list iterator when the descriptor is reused by another
thread without it being deleted from the list.

Otherwise
Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx>
 
> 
> Fixes: 16e19e11228b ("dmaengine: idxd: Fix list corruption in description completion")
> Signed-off-by: Li RongQing <lirongqing@xxxxxxxxx>
> ---
>  drivers/dma/idxd/irq.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/idxd/irq.c b/drivers/dma/idxd/irq.c
> index 8dc029c..fc049c9 100644
> --- a/drivers/dma/idxd/irq.c
> +++ b/drivers/dma/idxd/irq.c
> @@ -611,11 +611,13 @@ static void irq_process_work_list(struct idxd_irq_entry *irq_entry)
>  
>  	spin_unlock(&irq_entry->list_lock);
>  
> -	list_for_each_entry(desc, &flist, list) {
> +	list_for_each_entry_safe(desc, n, &flist, list) {
>  		/*
>  		 * Check against the original status as ABORT is software defined
>  		 * and 0xff, which DSA_COMP_STATUS_MASK can mask out.
>  		 */
> +		list_del(&desc->list);
> +
>  		if (unlikely(desc->completion->status == IDXD_COMP_DESC_ABORT)) {
>  			idxd_desc_complete(desc, IDXD_COMPLETE_ABORT, true);
>  			continue;




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