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authorXiang Chen <chenxiang66@hisilicon.com>2020-09-01 14:13:03 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2020-09-03 05:49:07 +0300
commit847e8355294597898ed3b6c2a3130ab962d03004 (patch)
tree566ca4f832e5dcbaad0d9f19e39ff2f49d664826 /drivers/scsi/hisi_sas
parent2a5c98d2d2fe2aeaf95274a48fc9d92b5955dc74 (diff)
downloadlinux-847e8355294597898ed3b6c2a3130ab962d03004.tar.xz
scsi: hisi_sas: Avoid accessing to SSP task for SMP I/Os
hisi_sas_slot_task_free() attempts to dereference SSP task for non-ATA tasks. If the task is SMP, the code may reference the wrong structure although this may not cause any problems. To avoid this, only access to SSP task when slot->n_elem_dif is not 0 which indicates this is an SSP task. Link: https://lore.kernel.org/r/1598958790-232272-2-git-send-email-john.garry@huawei.com Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com> Signed-off-by: John Garry <john.garry@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/hisi_sas')
-rw-r--r--drivers/scsi/hisi_sas/hisi_sas_main.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 11caa4b0d797..fdf5f0f1b60b 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -229,17 +229,18 @@ void hisi_sas_slot_task_free(struct hisi_hba *hisi_hba, struct sas_task *task,
task->lldd_task = NULL;
if (!sas_protocol_ata(task->task_proto)) {
- struct sas_ssp_task *ssp_task = &task->ssp_task;
- struct scsi_cmnd *scsi_cmnd = ssp_task->cmd;
-
if (slot->n_elem)
dma_unmap_sg(dev, task->scatter,
task->num_scatter,
task->data_dir);
- if (slot->n_elem_dif)
+ if (slot->n_elem_dif) {
+ struct sas_ssp_task *ssp_task = &task->ssp_task;
+ struct scsi_cmnd *scsi_cmnd = ssp_task->cmd;
+
dma_unmap_sg(dev, scsi_prot_sglist(scsi_cmnd),
scsi_prot_sg_count(scsi_cmnd),
task->data_dir);
+ }
}
}