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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>,
        "David S. Miller" <davem@davemloft.net>,
        Sasha Levin <alexander.levin@verizon.com>
Subject: [PATCH 4.14 116/159] net: qualcomm: rmnet: Fix leak on transmit failure
Date:   Fri, 23 Feb 2018 19:27:04 +0100
Message-Id: <20180223170757.353074376@linuxfoundation.org>
In-Reply-To: <20180223170743.086611315@linuxfoundation.org>
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4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>


[ Upstream commit c20a548792f15f8d8e38cd74356301c6db0d241f ]

If a skb in transmit path does not have sufficient headroom to add
the map header, the skb is not sent out and is never freed.

Fixes: ceed73a2cf4a ("drivers: net: ethernet: qualcomm: rmnet: Initial implementation")
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
@@ -166,12 +166,12 @@ static int rmnet_map_egress_handler(stru
 
 	if (skb_headroom(skb) < required_headroom) {
 		if (pskb_expand_head(skb, required_headroom, 0, GFP_KERNEL))
-			return RMNET_MAP_CONSUMED;
+			goto fail;
 	}
 
 	map_header = rmnet_map_add_map_header(skb, additional_header_len, 0);
 	if (!map_header)
-		return RMNET_MAP_CONSUMED;
+		goto fail;
 
 	if (port->egress_data_format & RMNET_EGRESS_FORMAT_MUXING) {
 		if (ep->mux_id == 0xff)
@@ -183,6 +183,10 @@ static int rmnet_map_egress_handler(stru
 	skb->protocol = htons(ETH_P_MAP);
 
 	return RMNET_MAP_SUCCESS;
+
+fail:
+	kfree_skb(skb);
+	return RMNET_MAP_CONSUMED;
 }
 
 /* Ingress / Egress Entry Points */