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-rw-r--r--drivers/scsi/scsi.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 3cda5d26b..e70ab8db3 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -328,21 +328,39 @@ static int scsi_vpd_inquiry(struct scsi_device *sdev, unsigned char *buffer,
return result + 4;
}
+enum scsi_vpd_parameters {
+ SCSI_VPD_HEADER_SIZE = 4,
+ SCSI_VPD_LIST_SIZE = 36,
+};
+
static int scsi_get_vpd_size(struct scsi_device *sdev, u8 page)
{
- unsigned char vpd_header[SCSI_VPD_HEADER_SIZE] __aligned(4);
+ unsigned char vpd[SCSI_VPD_LIST_SIZE] __aligned(4);
int result;
if (sdev->no_vpd_size)
return SCSI_DEFAULT_VPD_LEN;
/*
+ * Fetch the supported pages VPD and validate that the requested page
+ * number is present.
+ */
+ if (page != 0) {
+ result = scsi_vpd_inquiry(sdev, vpd, 0, sizeof(vpd));
+ if (result < SCSI_VPD_HEADER_SIZE)
+ return 0;
+
+ result -= SCSI_VPD_HEADER_SIZE;
+ if (!memchr(&vpd[SCSI_VPD_HEADER_SIZE], page, result))
+ return 0;
+ }
+ /*
* Fetch the VPD page header to find out how big the page
* is. This is done to prevent problems on legacy devices
* which can not handle allocation lengths as large as
* potentially requested by the caller.
*/
- result = scsi_vpd_inquiry(sdev, vpd_header, page, sizeof(vpd_header));
+ result = scsi_vpd_inquiry(sdev, vpd, page, SCSI_VPD_HEADER_SIZE);
if (result < 0)
return 0;