[lvc-project] [PATCH 5.10.y 3/3] scsi: sd: Fix sd_do_mode_sense() buffer length handling

[Vasiliy Kovalev]

From: Damien Le Moal <damien.lemoal at wdc.com>

commit c749301ebee82eb5e97dec14b6ab31a4aabe37a6 upstream.

For devices that explicitly asked for MODE SENSE(10) use, make sure that
scsi_mode_sense() is called with a buffer of at least 8 bytes so that the
sense header fits.

Link: https://lore.kernel.org/r/20210820070255.682775-4-damien.lemoal@wdc.com
Signed-off-by: Damien Le Moal <damien.lemoal at wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen at oracle.com>
Signed-off-by: Vasiliy Kovalev <kovalev at altlinux.org>
---
 drivers/scsi/sd.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index f2dfd9853d3432..2f2ca287887603 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2649,6 +2649,13 @@ sd_do_mode_sense(struct scsi_disk *sdkp, int dbd, int modepage,
 		 unsigned char *buffer, int len, struct scsi_mode_data *data,
 		 struct scsi_sense_hdr *sshdr)
 {
+	/*
+	 * If we must use MODE SENSE(10), make sure that the buffer length
+	 * is at least 8 bytes so that the mode sense header fits.
+	 */
+	if (sdkp->device->use_10_for_ms && len < 8)
+		len = 8;
+
 	return scsi_mode_sense(sdkp->device, dbd, modepage, buffer, len,
 			       SD_TIMEOUT, sdkp->max_retries, data,
 			       sshdr);
-- 
2.33.8