[PATCH v4 -next] mtd: docg3: fix a possible memory leak of mtd->name

[YueHaibing]

In case DOC_CHIPID_G3, mtd->name is not freed in err handling path,
which is alloced by kasprintf(). Fix this by using devm_kasprintf().

Fixes: ae9d4934b2d7 ("mtd: docg3: add multiple floor support")
Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
v4: remove 'kfree' in remove patch
v3: use devm_kasprintf
---
 drivers/mtd/devices/docg3.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c
index 4c94fc0..ffd5ed5 100644
--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -1767,8 +1767,8 @@ static int __init doc_set_driver_info(int chip_id, struct 
mtd_info *mtd)
 
        switch (chip_id) {
        case DOC_CHIPID_G3:
-               mtd->name = kasprintf(GFP_KERNEL, "docg3.%d",
-                                     docg3->device_id);
+               mtd->name = devm_kasprintf(docg3->dev, GFP_KERNEL, "docg3.%d",
+                                          docg3->device_id);
                if (!mtd->name)
                        return -ENOMEM;
                docg3->max_block = 2047;
@@ -1886,7 +1886,6 @@ static void doc_release_device(struct mtd_info *mtd)
        mtd_device_unregister(mtd);
        kfree(docg3->bbt);
        kfree(docg3);
-       kfree(mtd->name);
        kfree(mtd);
 }
 
-- 
2.7.0