linux-kernel - [PATCH 5.6 15/49] scsi: sg: add sg_remove_request in sg

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Message-Id: <20200508123045.161722497@linuxfoundation.org>
Date:   Fri,  8 May 2020 14:35:32 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Douglas Gilbert <dgilbert@...erlog.com>,
        Wu Bo <wubo40@...wei.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.6 15/49] scsi: sg: add sg_remove_request in sg_write

From: Wu Bo <wubo40@...wei.com>

[ Upstream commit 83c6f2390040f188cc25b270b4befeb5628c1aee ]

If the __copy_from_user function failed we need to call sg_remove_request
in sg_write.

Link: https://lore.kernel.org/r/610618d9-e983-fd56-ed0f-639428343af7@huawei.com
Acked-by: Douglas Gilbert <dgilbert@...erlog.com>
Signed-off-by: Wu Bo <wubo40@...wei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/sg.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 9c0ee192f0f9c..20472aaaf630a 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -685,8 +685,10 @@ sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
 	hp->flags = input_size;	/* structure abuse ... */
 	hp->pack_id = old_hdr.pack_id;
 	hp->usr_ptr = NULL;
-	if (copy_from_user(cmnd, buf, cmd_size))
+	if (copy_from_user(cmnd, buf, cmd_size)) {
+		sg_remove_request(sfp, srp);
 		return -EFAULT;
+	}
 	/*
 	 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
 	 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
-- 
2.20.1