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From:   Zhouyang Jia <jiazhouyang09@gmail.com>
Cc:     Zhouyang Jia <jiazhouyang09@gmail.com>,
        Felipe Balbi <balbi@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Bhumika Goyal <bhumirks@gmail.com>,
        Johan Hovold <johan@kernel.org>,
        Andrew Gabbasov <andrew_gabbasov@mentor.com>,
        David Lechner <david@lechnology.com>,
        linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] usb: gadget: add error handling for skb_realloc_headroom
Date:   Tue, 12 Jun 2018 12:41:41 +0800
Message-Id: <1528778503-41615-1-git-send-email-jiazhouyang09@gmail.com>
To:     unlisted-recipients:; (no To-header on input)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

When skb_realloc_headroom fails, the lack of error-handling code may
cause unexpected results.

This patch adds error-handling code after calling skb_realloc_headroom.

Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
---
 drivers/usb/gadget/function/f_rndis.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/gadget/function/f_rndis.c b/drivers/usb/gadget/function/f_rndis.c
index d48df36..17c164b 100644
--- a/drivers/usb/gadget/function/f_rndis.c
+++ b/drivers/usb/gadget/function/f_rndis.c
@@ -374,6 +374,9 @@ static struct sk_buff *rndis_add_header(struct gether *port,
 		return NULL;
 
 	skb2 = skb_realloc_headroom(skb, sizeof(struct rndis_packet_msg_type));
+	if (!skb2)
+		return NULL;
+
 	rndis_add_hdr(skb2);
 
 	dev_kfree_skb(skb);
-- 
2.7.4