Re: [PATCH] tcmu: Oops in unmap_thread_fn()

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On 08/01/2017 03:09 PM, Dan Carpenter wrote:
> Calling list_del() on the iterator pointer in list_for_each_entry() will
> cause an oops.  We need to user the _safe() version for that.
> 
> Fixes: c73d02f63c16 ("tcmu: Add fifo type waiter list support to avoid starvation")
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> 
> diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
> index 9258b7dd2c30..fd9fcea68d23 100644
> --- a/drivers/target/target_core_user.c
> +++ b/drivers/target/target_core_user.c
> @@ -1985,7 +1985,7 @@ static struct target_backend_ops tcmu_ops = {
>  
>  static int unmap_thread_fn(void *data)
>  {
> -	struct tcmu_dev *udev;
> +	struct tcmu_dev *udev, *tmp;
>  	loff_t off;
>  	uint32_t start, end, block;
>  	static uint32_t free_blocks;
> @@ -2056,7 +2056,7 @@ static int unmap_thread_fn(void *data)
>  		 * for the global data pool blocks.
>  		 */
>  		mutex_lock(&root_udev_waiter_mutex);
> -		list_for_each_entry(udev, &root_udev_waiter, waiter) {
> +		list_for_each_entry_safe(udev, tmp, &root_udev_waiter, waiter) {
>  			mutex_lock(&udev->cmdr_lock);
>  			if (udev->waiting_blocks < free_blocks) {
>  				mutex_unlock(&udev->cmdr_lock);
> 

Thanks.

Reviewed-by: Mike Christie <mchristi@xxxxxxxxxx>
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