Hi,
I just found another instance of this same issue at line 1053.
Please, drop this patch and I'll send v2 addressing both instances, shortly.
Thanks
--
Gustavo
On 10/18/18 6:41 PM, Gustavo A. R. Silva wrote:
> There is a NULL pointer dereference in case *slot* happens to
> be NULL at line 1878:
>
> struct hisi_sas_cq *cq =
> &hisi_hba->cq[slot->dlvry_queue];
>
> Notice that *slot* is being NULL checked at line 1881: if (slot),
> which implies it may be NULL.
>
> Fix this by placing the declaration and definition of variable cq,
> which contains the pointer dereference slot->dlvry_queue, after
> *slot* has been properly NULL checked.
>
> Addresses-Coverity-ID: 1474515 ("Dereference before null check")
> Fixes: 584f53fe5f52 ("scsi: hisi_sas: Fix the race between IO completion and
> timeout for SMP/internal IO")
> Signed-off-by: Gustavo A. R. Silva <[email protected]>
> ---
> drivers/scsi/hisi_sas/hisi_sas_main.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c
> b/drivers/scsi/hisi_sas/hisi_sas_main.c
> index 2e5eaf1..e3f7c7b 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_main.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
> @@ -1875,10 +1875,10 @@ hisi_sas_internal_task_abort(struct hisi_hba
> *hisi_hba,
> if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
> if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
> struct hisi_sas_slot *slot = task->lldd_task;
> - struct hisi_sas_cq *cq =
> - &hisi_hba->cq[slot->dlvry_queue];
>
> if (slot) {
> + struct hisi_sas_cq *cq =
> + &hisi_hba->cq[slot->dlvry_queue];
> /*
> * flush tasklet to avoid free'ing task
> * before using task in IO completion
>
