linux-kernel - [PATCH 1/2] scsi: Fix get_user() in call sg_scsi

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Date:   Wed, 16 Nov 2022 03:43:52 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     kirill@...temov.name
Cc:     dave.hansen@...el.com, dave.hansen@...ux.intel.com,
        jejb@...ux.ibm.com, kirill.shutemov@...ux.intel.com,
        linux-kernel@...r.kernel.org, lkp@...el.com,
        martin.petersen@...cle.com, oe-kbuild-all@...ts.linux.dev,
        x86@...nel.org
Subject: [PATCH 1/2] scsi: Fix get_user() in call sg_scsi_ioctl()

get_user() expects the pointer to be pointer-to-simple-variable type,
but sic->data is array of 'unsigned char'. It violates get_user()
contracts.

Cast it explicitly to 'unsigned char __user *'. It matches current
behaviour.

This is preparation for fixing sparse warnings caused by Linear Address
Masking patchset.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
---
 drivers/scsi/scsi_ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_ioctl.c b/drivers/scsi/scsi_ioctl.c
index 2d20da55fb64..72b3ab5137b8 100644
--- a/drivers/scsi/scsi_ioctl.c
+++ b/drivers/scsi/scsi_ioctl.c
@@ -519,7 +519,7 @@ static int sg_scsi_ioctl(struct request_queue *q, fmode_t mode,
 		return -EFAULT;
 	if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 		return -EINVAL;
-	if (get_user(opcode, sic->data))
+	if (get_user(opcode, (unsigned char __user *)sic->data))
 		return -EFAULT;
 
 	bytes = max(in_len, out_len);
-- 
2.38.0