[PATCH][SRU Bionic] scsi: hisi_sas: Fix to only call scsi_get_prot_op() for non-NULL scsi_cmnd

dann frazier dann.frazier at canonical.com
Mon Dec 6 19:06:06 UTC 2021


From: John Garry <john.garry at huawei.com>

BugLink: https://launchpad.net/bugs/1953386

A NULL-pointer dereference was introduced for TMF SSP commands from the
upstreaming reworking.

Fix this by relocating the scsi_get_prot_op() callsite.

Fixes: d6a9000b81be ("scsi: hisi_sas: Add support for DIF feature for v2 hw")
Signed-off-by: John Garry <john.garry at huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen at oracle.com>
(cherry picked from commit e1ba0b0b44512c5a209526c09ea3eb7d256b6951)
Signed-off-by: dann frazier <dann.frazier at canonical.com>
---
 drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index 095c973b866d..c10c1300ceda 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -1033,8 +1033,8 @@ static void prep_ssp_v3_hw(struct hisi_hba *hisi_hba,
 	struct sas_ssp_task *ssp_task = &task->ssp_task;
 	struct scsi_cmnd *scsi_cmnd = ssp_task->cmd;
 	struct hisi_sas_tmf_task *tmf = slot->tmf;
-	unsigned char prot_op = scsi_get_prot_op(scsi_cmnd);
 	int has_data = 0, priority = !!tmf;
+	unsigned char prot_op;
 	u8 *buf_cmd;
 	u32 dw1 = 0, dw2 = 0, len = 0;
 
@@ -1049,6 +1049,7 @@ static void prep_ssp_v3_hw(struct hisi_hba *hisi_hba,
 		dw1 |= 2 << CMD_HDR_FRAME_TYPE_OFF;
 		dw1 |= DIR_NO_DATA << CMD_HDR_DIR_OFF;
 	} else {
+		prot_op = scsi_get_prot_op(scsi_cmnd);
 		dw1 |= 1 << CMD_HDR_FRAME_TYPE_OFF;
 		switch (scsi_cmnd->sc_data_direction) {
 		case DMA_TO_DEVICE:
-- 
2.34.1




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