netdev - [PATCH net-next v2 2/2] net: qualcomm: rmnet: Fix rx

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Date:   Tue,  2 Feb 2021 17:16:08 +0100
From:   Loic Poulain <loic.poulain@...aro.org>
To:     kuba@...nel.org, davem@...emloft.net
Cc:     willemdebruijn.kernel@...il.com, netdev@...r.kernel.org,
        stranche@...eaurora.org, subashab@...eaurora.org,
        Loic Poulain <loic.poulain@...aro.org>
Subject: [PATCH net-next v2 2/2] net: qualcomm: rmnet: Fix rx_handler for non-linear skbs

There is no guarantee that rmnet rx_handler is only fed with linear
skbs, but current rmnet implementation does not check that, leading
to crash in case of non linear skbs processed as linear ones.

Fix that by ensuring skb linearization before processing.

Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
---
 v2: Add this patch to the series to prevent crash

 drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
index 3d7d3ab..2776c32 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
@@ -180,7 +180,7 @@ rx_handler_result_t rmnet_rx_handler(struct sk_buff **pskb)
 	struct rmnet_port *port;
 	struct net_device *dev;
 
-	if (!skb)
+	if (!skb || skb_linearize(skb))
 		goto done;
 
 	if (skb->pkt_type == PACKET_LOOPBACK)
-- 
2.7.4