linux-kernel - [PATCH 1/2 v2] mtd: ubi: fix improper return value

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Date:   Mon,  5 Dec 2016 11:19:18 +0800
From:   Pan Bian <bianpan2016@....com>
To:     Artem Bityutskiy <dedekind1@...il.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        linux-mtd@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Pan Bian <bianpan2016@....com>
Subject: [PATCH 1/2 v2] mtd: ubi: fix improper return value

When __vmalloc() returns a NULL pointer, the region is not really
checked, and we cannot conclude that only 0xFF bytes are present at
offset. Thus, returing 0 seems improper. This patches fixes it, returns
"-ENOMEM" and removes the warning.

Signed-off-by: Pan Bian <bianpan2016@....com>
---
 drivers/mtd/ubi/io.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index b6fb8f9..00d7f44 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -1411,10 +1411,8 @@ int ubi_self_check_all_ff(struct ubi_device *ubi, int pnum, int offset, int len)
 		return 0;
 
 	buf = __vmalloc(len, GFP_NOFS, PAGE_KERNEL);
-	if (!buf) {
-		ubi_err(ubi, "cannot allocate memory to check for 0xFFs");
-		return 0;
-	}
+	if (!buf)
+		return -ENOMEM;
 
 	err = mtd_read(ubi->mtd, addr, len, &read, buf);
 	if (err && !mtd_is_bitflip(err)) {
-- 
1.9.1