Patch "ata: libata-scsi: Check ATA_QCFLAG_RTF_FILLED before using result_tf" has been added to the 6.10-stable tree

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This is a note to let you know that I've just added the patch titled

    ata: libata-scsi: Check ATA_QCFLAG_RTF_FILLED before using result_tf

to the 6.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ata-libata-scsi-check-ata_qcflag_rtf_filled-before-u.patch
and it can be found in the queue-6.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit c562823a97362bfe4f428369ac7ecb3d830589cf
Author: Igor Pylypiv <ipylypiv@xxxxxxxxxx>
Date:   Tue Jul 2 02:47:35 2024 +0000

    ata: libata-scsi: Check ATA_QCFLAG_RTF_FILLED before using result_tf
    
    [ Upstream commit 816be86c7993d3c5832c3017c0056297e86f978c ]
    
    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@xxxxxxx>
    Reviewed-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
    Reviewed-by: Niklas Cassel <cassel@xxxxxxxxxx>
    Signed-off-by: Igor Pylypiv <ipylypiv@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20240702024735.1152293-8-ipylypiv@xxxxxxxxxx
    Signed-off-by: Niklas Cassel <cassel@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 4deee71006ef..4116ae088719 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;
@@ -924,10 +931,17 @@ static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
  */
 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.
@@ -979,6 +993,13 @@ 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.
 	 */




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