Re: [Qemu-devel] [PATCH] block/iscsi: fix segfault if writesame fails

[Paolo Bonzini <pbonzini@redhat.com>]

Il 22/02/2014 13:17, Peter Lieven ha scritto:
> commit fa6252b0 introduced a segfault because it tries
> to read iTask.task->sense after iTask.task has been
> freed.
>
> CC: qemu-stable@nongnu.org

Not needed, it's not in the 1.7.1 pending release.  Applied to 
scsi-next, thanks.

Paolo

> Signed-off-by: Peter Lieven <pl@kamp.de>
> ---
>  block/iscsi.c |   17 +++++++++--------
>  1 file changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/block/iscsi.c b/block/iscsi.c
> index f8e496f..123fa06 100644
> --- a/block/iscsi.c
> +++ b/block/iscsi.c
> @@ -830,6 +830,15 @@ retry:
>          qemu_coroutine_yield();
>      }
>
> +    if (iTask.status == SCSI_STATUS_CHECK_CONDITION &&
> +        iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST &&
> +        iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE) {
> +        /* WRITE SAME is not supported by the target */
> +        iscsilun->has_write_same = false;
> +        scsi_free_scsi_task(iTask.task);
> +        return -ENOTSUP;
> +    }
> +
>      if (iTask.task != NULL) {
>          scsi_free_scsi_task(iTask.task);
>          iTask.task = NULL;
> @@ -840,14 +849,6 @@ retry:
>      }
>
>      if (iTask.status != SCSI_STATUS_GOOD) {
> -        if (iTask.status == SCSI_STATUS_CHECK_CONDITION &&
> -            iTask.task->sense.key == SCSI_SENSE_ILLEGAL_REQUEST &&
> -            iTask.task->sense.ascq == SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE) {
> -            /* WRITE SAME is not supported by the target */
> -            iscsilun->has_write_same = false;
> -            return -ENOTSUP;
> -        }
> -
>          return -EIO;
>      }
>
>