linux-kernel - [PATCH] mtd: maps: fix error return code of physmap_flash

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Date:   Sun,  7 Mar 2021 19:44:46 -0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        chris.packham@...iedtelesis.co.nz,
        Sergey.Semin@...kalelectronics.ru
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] mtd: maps: fix error return code of physmap_flash_remove()

When platform_get_drvdata() returns NULL to info, no error return code
of physmap_flash_remove() is assigned.
To fix this bug, err is assigned with -EINVAL in this case

Fixes: 73566edf9b91 ("[MTD] Convert physmap to platform driver")
Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
 drivers/mtd/maps/physmap-core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/maps/physmap-core.c b/drivers/mtd/maps/physmap-core.c
index 001ed5deb622..4f63b8430c71 100644
--- a/drivers/mtd/maps/physmap-core.c
+++ b/drivers/mtd/maps/physmap-core.c
@@ -69,8 +69,10 @@ static int physmap_flash_remove(struct platform_device *dev)
 	int i, err = 0;
 
 	info = platform_get_drvdata(dev);
-	if (!info)
+	if (!info) {
+		err = -EINVAL;
 		goto out;
+	}
 
 	if (info->cmtd) {
 		err = mtd_device_unregister(info->cmtd);
-- 
2.17.1