linux-kernel - [PATCH -next] mtd: fix missing unlock on error in mtdchar_compat

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Date:   Sat, 25 Jul 2020 06:34:16 +0000
From:   Wei Yongjun <weiyongjun1@...wei.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Wei Yongjun <weiyongjun1@...wei.com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>, Hulk Robot <hulkci@...wei.com>
Subject: [PATCH -next] mtd: fix missing unlock on error in mtdchar_compat_ioctl()

Add the missing unlock before return from function mtdchar_compat_ioctl()
in the error handling case.

Fixes: 210bec567936 ("mtd: properly check all write ioctls for permissions")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
 drivers/mtd/mtdchar.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 52c120f9fb0d..b40f46a43fc6 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -1064,8 +1064,10 @@ static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
 		struct mtd_oob_buf32 buf;
 		struct mtd_oob_buf32 __user *buf_user = argp;
 
-		if (!(file->f_mode & FMODE_WRITE))
-			return -EPERM;
+		if (!(file->f_mode & FMODE_WRITE)) {
+			ret = -EPERM;
+			break;
+		}
 
 		if (copy_from_user(&buf, argp, sizeof(buf)))
 			ret = -EFAULT;