net: qualcomm: rmnet: Fix leak on transmit failure

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>

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
index 29842ccc91a9d35ff49a0e5ac1cb61ec61fb3b49..08e4afc0ab39b42ff8585a466daf64d9f25fb703 100644 (file)
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
@@ -126,12 +126,12 @@ static int rmnet_map_egress_handler(struct sk_buff *skb,
 
        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 (mux_id == 0xff)
@@ -143,6 +143,10 @@ static int rmnet_map_egress_handler(struct sk_buff *skb,
        skb->protocol = htons(ETH_P_MAP);
 
        return RMNET_MAP_SUCCESS;
+
+fail:
+       kfree_skb(skb);
+       return RMNET_MAP_CONSUMED;
 }
 
 static void