linux-kernel - [PATCH 5.4 021/111] atm: uPD98402: fix incorrect allocation

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Message-Id: <20210329075615.896055284@linuxfoundation.org>
Date:   Mon, 29 Mar 2021 09:57:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tong Zhang <ztong0001@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 021/111] atm: uPD98402: fix incorrect allocation

From: Tong Zhang <ztong0001@...il.com>

[ Upstream commit 3153724fc084d8ef640c611f269ddfb576d1dcb1 ]

dev->dev_data is set in zatm.c, calling zatm_start() will overwrite this
dev->dev_data in uPD98402_start() and a subsequent PRIV(dev)->lock
(i.e dev->phy_data->lock) will result in a null-ptr-dereference.

I believe this is a typo and what it actually want to do is to allocate
phy_data instead of dev_data.

Signed-off-by: Tong Zhang <ztong0001@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/atm/uPD98402.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/atm/uPD98402.c b/drivers/atm/uPD98402.c
index 7850758b5bb8..239852d85558 100644
--- a/drivers/atm/uPD98402.c
+++ b/drivers/atm/uPD98402.c
@@ -211,7 +211,7 @@ static void uPD98402_int(struct atm_dev *dev)
 static int uPD98402_start(struct atm_dev *dev)
 {
 	DPRINTK("phy_start\n");
-	if (!(dev->dev_data = kmalloc(sizeof(struct uPD98402_priv),GFP_KERNEL)))
+	if (!(dev->phy_data = kmalloc(sizeof(struct uPD98402_priv),GFP_KERNEL)))
 		return -ENOMEM;
 	spin_lock_init(&PRIV(dev)->lock);
 	memset(&PRIV(dev)->sonet_stats,0,sizeof(struct k_sonet_stats));
-- 
2.30.1