linux-kernel - [PATCH] scsi: sg: add sg_remove_request in sg_common

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Message-ID: <1586777290-17271-1-git-send-email-huawei.libin@huawei.com>
Date:   Mon, 13 Apr 2020 19:28:10 +0800
From:   Li Bin <huawei.libin@...wei.com>
To:     <dgilbert@...erlog.com>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <hare@...e.com>, <jthumshirn@...e.de>
CC:     <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <huawei.libin@...wei.com>, <xiexiuqi@...wei.com>
Subject: [PATCH] scsi: sg: add sg_remove_request in sg_common_write

If the dxfer_len is greater than 256M that the request is invalid,
it should call sg_remove_request in sg_common_write.

Fixes: f930c7043663 ("scsi: sg: only check for dxfer_len greater than 256M")
Signed-off-by: Li Bin <huawei.libin@...wei.com>
---
 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 4e6af592..9c0ee19 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -793,8 +793,10 @@ static int get_sg_io_pack_id(int *pack_id, void __user *buf, size_t count)
 			"sg_common_write:  scsi opcode=0x%02x, cmd_size=%d\n",
 			(int) cmnd[0], (int) hp->cmd_len));
 
-	if (hp->dxfer_len >= SZ_256M)
+	if (hp->dxfer_len >= SZ_256M) {
+		sg_remove_request(sfp, srp);
 		return -EINVAL;
+	}
 
 	k = sg_start_req(srp, cmnd);
 	if (k) {
-- 
1.7.12.4