[PATCH v4 7/8] ata: libata-scsi: Check ATA_QCFLAG_RTF_FILLED before using result_tf

Igor Pylypiv
2024-07-01T19:58:17Z

qc->result_tf contents are only valid when the ATA_QCFLAG_RTF_FILLED flag
is set. The ATA_QCFLAG_RTF_FILLED flag should be always set for commands
that failed or for commands that have the ATA_QCFLAG_RESULT_TF flag set.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
---
drivers/ata/libata-scsi.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 92d75780fc3b..a66c177b6087 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -242,10 +242,17 @@ void ata_scsi_set_sense_information(struct ata_device *dev,
*/
static void ata_scsi_set_passthru_sense_fields(struct ata_queued_cmd *qc)
{
+ struct ata_device *dev = qc->dev;
struct scsi_cmnd *cmd = qc->scsicmd;
struct ata_taskfile *tf = &qc->result_tf;
unsigned char *sb = cmd->sense_buffer;

+ if (!(qc->flags & ATA_QCFLAG_RTF_FILLED)) {
+ ata_dev_dbg(dev,
+ "missing result TF: can't set ATA PT sense fields\n");
+ return;
+ }
+
if ((sb[0] & 0x7f) >= 0x72) {
unsigned char *desc;
u8 len;
@@ -923,10 +930,17 @@ static void ata_to_sense_error(u8 drv_stat, u8 drv_err, u8 *sk, u8 *asc,
*/
static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
{
+ struct ata_device *dev = qc->dev;
struct scsi_cmnd *cmd = qc->scsicmd;
struct ata_taskfile *tf = &qc->result_tf;
u8 sense_key, asc, ascq;

+ if (!(qc->flags & ATA_QCFLAG_RTF_FILLED)) {
+ ata_dev_dbg(dev,
+ "missing result TF: can't generate ATA PT sense data\n");
+ return;
+ }
+
/*
* Use ata_to_sense_error() to map status register bits
* onto sense key, asc & ascq.
@@ -967,6 +981,13 @@ static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
ata_scsi_set_sense(dev, cmd, NOT_READY, 0x04, 0x21);
return;
}
+
+ if (!(qc->flags & ATA_QCFLAG_RTF_FILLED)) {
+ ata_dev_dbg(dev,
+ "missing result TF: can't generate sense data\n");
+ return;
+ }
+
/* Use ata_to_sense_error() to map status register bits
* onto sense key, asc & ascq.
*/
--
2.45.2.803.g4e1b14247a-goog