linux-kernel - [PATCH][v2] usb: gadget: eem: fix wrong eem header operation

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Message-Id: <20210607122825.3210-1-linyyuan@codeaurora.org>
Date:   Mon,  7 Jun 2021 20:28:25 +0800
From:   Linyu Yuan <linyyuan@...eaurora.org>
To:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Linyu Yuan <linyyuan@...eaurora.com>
Subject: [PATCH][v2] usb: gadget: eem: fix wrong eem header operation

From: Linyu Yuan <linyyuan@...eaurora.com>

when skb_clone() or skb_copy_expand() fail,
it should pull skb with lengh indicated by header,
or not it will read network data and check it as header.

Signed-off-by: Linyu Yuan <linyyuan@...eaurora.com>
---
 drivers/usb/gadget/function/f_eem.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/function/f_eem.c b/drivers/usb/gadget/function/f_eem.c
index cfcc4e81fb77..28dd5f1fd106 100644
--- a/drivers/usb/gadget/function/f_eem.c
+++ b/drivers/usb/gadget/function/f_eem.c
@@ -495,7 +495,7 @@ static int eem_unwrap(struct gether *port,
 			skb2 = skb_clone(skb, GFP_ATOMIC);
 			if (unlikely(!skb2)) {
 				DBG(cdev, "unable to unframe EEM packet\n");
-				continue;
+				goto next;
 			}
 			skb_trim(skb2, len - ETH_FCS_LEN);
 
@@ -505,7 +505,7 @@ static int eem_unwrap(struct gether *port,
 						GFP_ATOMIC);
 			if (unlikely(!skb3)) {
 				dev_kfree_skb_any(skb2);
-				continue;
+				goto next;
 			}
 			dev_kfree_skb_any(skb2);
 			skb_queue_tail(list, skb3);
-- 
2.25.1