linux-kernel - [PATCH v2] mtd: spi-nor: fix a memory leak bug

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Message-Id: <1566234960-3226-1-git-send-email-wenwen@cs.uga.edu>
Date:   Mon, 19 Aug 2019 12:16:00 -0500
From:   Wenwen Wang <wenwen@...uga.edu>
To:     Wenwen Wang <wenwen@...uga.edu>
Cc:     Marek Vasut <marek.vasut@...il.com>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org (open list:SPI NOR SUBSYSTEM),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2] mtd: spi-nor: fix a memory leak bug

In spi_nor_parse_4bait(), 'dwords' is allocated through kmalloc(). However,
it is not deallocated in the following execution if spi_nor_read_sfdp()
fails, leading to a memory leak. To fix this issue, free 'dwords' before
returning the error.

Fixes: 816873eaeec6 ("mtd: spi-nor: parse SFDP 4-byte Address Instruction
Table")

Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
---
 drivers/mtd/spi-nor/spi-nor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 03cc788..a41a466 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -3453,7 +3453,7 @@ static int spi_nor_parse_4bait(struct spi_nor *nor,
 	addr = SFDP_PARAM_HEADER_PTP(param_header);
 	ret = spi_nor_read_sfdp(nor, addr, len, dwords);
 	if (ret)
-		return ret;
+		goto out;
 
 	/* Fix endianness of the 4BAIT DWORDs. */
 	for (i = 0; i < SFDP_4BAIT_DWORD_MAX; i++)
-- 
2.7.4