linux-kernel - [PATCH 2/2] mtd: rawnand: meson: fix a potential memory leak in meson_nfc_read

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Date:   Fri,  1 Mar 2019 18:38:20 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     linux-amlogic@...ts.infradead.org, linux-mtd@...ts.infradead.org,
        liang.yang@...ogic.com
Cc:     bbrezillon@...nel.org, miquel.raynal@...tlin.com, richard@....at,
        jianxin.pan@...ogic.com, linux-kernel@...r.kernel.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH 2/2] mtd: rawnand: meson: fix a potential memory leak in meson_nfc_read_buf

meson_nfc_dma_buffer_setup() is called with the "info" buffer which is
allocated a few lines before using kzalloc(). If
meson_nfc_dma_buffer_setup() fails we need to free the allocated "info"
buffer instead of only freeing it upon success.

Fixes: 8fae856c53500a ("mtd: rawnand: meson: add support for Amlogic NAND flash controller")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 drivers/mtd/nand/raw/meson_nand.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
index a1d8506b61c7..38db4fd61459 100644
--- a/drivers/mtd/nand/raw/meson_nand.c
+++ b/drivers/mtd/nand/raw/meson_nand.c
@@ -534,7 +534,7 @@ static int meson_nfc_read_buf(struct nand_chip *nand, u8 *buf, int len)
 	ret = meson_nfc_dma_buffer_setup(nand, buf, len, info,
 					 PER_INFO_BYTE, DMA_FROM_DEVICE);
 	if (ret)
-		return ret;
+		goto out;
 
 	cmd = NFC_CMD_N2M | (len & GENMASK(5, 0));
 	writel(cmd, nfc->reg_base + NFC_REG_CMD);
@@ -542,6 +542,8 @@ static int meson_nfc_read_buf(struct nand_chip *nand, u8 *buf, int len)
 	meson_nfc_drain_cmd(nfc);
 	meson_nfc_wait_cmd_finish(nfc, 1000);
 	meson_nfc_dma_buffer_release(nand, len, PER_INFO_BYTE, DMA_FROM_DEVICE);
+
+out:
 	kfree(info);
 
 	return ret;
-- 
2.21.0