[2/3] scsi_ioctl.c: switch SCSI_IOCTL_GET_IDLUN to copy_to_user()
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Message ID 20200529001023.4107547-2-viro@ZenIV.linux.org.uk
State New
Headers show
Series
  • [1/3] compat sysinfo(2): don't bother with field-by-field copyout
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Commit Message

Al Viro May 29, 2020, 12:10 a.m. UTC
From: Al Viro <viro@zeniv.linux.org.uk>

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 drivers/scsi/scsi_ioctl.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

Patch
diff mbox series

diff --git a/drivers/scsi/scsi_ioctl.c b/drivers/scsi/scsi_ioctl.c
index 8f3af87b6bb0..45d04b7b2643 100644
--- a/drivers/scsi/scsi_ioctl.c
+++ b/drivers/scsi/scsi_ioctl.c
@@ -211,18 +211,18 @@  static int scsi_ioctl_common(struct scsi_device *sdev, int cmd, void __user *arg
 	}
 
 	switch (cmd) {
-	case SCSI_IOCTL_GET_IDLUN:
-		if (!access_ok(arg, sizeof(struct scsi_idlun)))
+	case SCSI_IOCTL_GET_IDLUN: {
+		struct scsi_idlun v = {
+			.dev_id = (sdev->id & 0xff)
+				 + ((sdev->lun & 0xff) << 8)
+				 + ((sdev->channel & 0xff) << 16)
+				 + ((sdev->host->host_no & 0xff) << 24),
+			.host_unique_id = sdev->host->unique_id
+		};
+		if (copy_to_user(arg, &v, sizeof(struct scsi_idlun)))
 			return -EFAULT;
-
-		__put_user((sdev->id & 0xff)
-			 + ((sdev->lun & 0xff) << 8)
-			 + ((sdev->channel & 0xff) << 16)
-			 + ((sdev->host->host_no & 0xff) << 24),
-			 &((struct scsi_idlun __user *)arg)->dev_id);
-		__put_user(sdev->host->unique_id,
-			 &((struct scsi_idlun __user *)arg)->host_unique_id);
 		return 0;
+	}
 	case SCSI_IOCTL_GET_BUS_NUMBER:
 		return put_user(sdev->host->host_no, (int __user *)arg);
 	case SCSI_IOCTL_PROBE_HOST: