linux-kernel - [PATCH 2/3] scsi_ioctl.c: switch SCSI_IOCTL_GET_IDLUN to copy_to

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Message-Id: <20200529001023.4107547-2-viro@ZenIV.linux.org.uk>
Date:   Fri, 29 May 2020 01:10:22 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH 2/3] scsi_ioctl.c: switch SCSI_IOCTL_GET_IDLUN to copy_to_user()

From: Al Viro <viro@...iv.linux.org.uk>

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

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:
-- 
2.11.0