linux-kernel - [PATCH 4.19 183/293] usb: gadget: u_ether: fix a potential null pointer dereference

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Message-Id: <20210920163939.538394252@linuxfoundation.org>
Date:   Mon, 20 Sep 2021 18:42:25 +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, Brooke Basile <brookebasile@...il.com>,
        "Bryan ODonoghue" <bryan.odonoghue@...aro.org>,
        Felipe Balbi <balbi@...nel.org>,
        Lorenzo Colitti <lorenzo@...gle.com>,
        Maciej Żenczykowski <maze@...gle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 183/293] usb: gadget: u_ether: fix a potential null pointer dereference

From: Maciej Żenczykowski <maze@...gle.com>

[ Upstream commit 8ae01239609b29ec2eff55967c8e0fe3650cfa09 ]

f_ncm tx timeout can call us with null skb to flush
a pending frame.  In this case skb is NULL to begin
with but ceases to be null after dev->wrap() completes.

In such a case in->maxpacket will be read, even though
we've failed to check that 'in' is not NULL.

Though I've never observed this fail in practice,
however the 'flush operation' simply does not make sense with
a null usb IN endpoint - there's nowhere to flush to...
(note that we're the gadget/device, and IN is from the point
 of view of the host, so here IN actually means outbound...)

Cc: Brooke Basile <brookebasile@...il.com>
Cc: "Bryan O'Donoghue" <bryan.odonoghue@...aro.org>
Cc: Felipe Balbi <balbi@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Lorenzo Colitti <lorenzo@...gle.com>
Signed-off-by: Maciej Żenczykowski <maze@...gle.com>
Link: https://lore.kernel.org/r/20210701114834.884597-6-zenczykowski@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/gadget/function/u_ether.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/function/u_ether.c b/drivers/usb/gadget/function/u_ether.c
index 156651df6b4d..d7a12161e553 100644
--- a/drivers/usb/gadget/function/u_ether.c
+++ b/drivers/usb/gadget/function/u_ether.c
@@ -491,8 +491,9 @@ static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
 	}
 	spin_unlock_irqrestore(&dev->lock, flags);
 
-	if (skb && !in) {
-		dev_kfree_skb_any(skb);
+	if (!in) {
+		if (skb)
+			dev_kfree_skb_any(skb);
 		return NETDEV_TX_OK;
 	}
 
-- 
2.30.2