linux-kernel - [PATCH] scsi: sg: fix memory leak in sg_build

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Message-ID: <1586777552-17524-1-git-send-email-huawei.libin@huawei.com>
Date:   Mon, 13 Apr 2020 19:32:32 +0800
From:   Li Bin <huawei.libin@...wei.com>
To:     <dgilbert@...erlog.com>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>
CC:     <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <huawei.libin@...wei.com>, <xiexiuqi@...wei.com>
Subject: [PATCH] scsi: sg: fix memory leak in sg_build_indirect

Fix a memory leak when there have failed, that we should free the pages
under the condition rem_sz > 0.

Signed-off-by: Li Bin <huawei.libin@...wei.com>
---
 drivers/scsi/sg.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 4e6af592..8441ac5 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1959,8 +1959,12 @@ static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned lon
 			 k, rem_sz));
 
 	schp->bufflen = blk_size;
-	if (rem_sz > 0)	/* must have failed */
+	if (rem_sz > 0)	{ /* must have failed */
+		for (i = 0; i < k; i++)
+			__free_pages(schp->pages[i], order);
+
 		return -ENOMEM;
+	}
 	return 0;
 out:
 	for (i = 0; i < k; i++)
-- 
1.7.12.4