[PATCH net 1/2] net: qualcomm: rmnet: Fix leak on transmit failure

[Subash Abhinov Kasiviswanathan]

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 <subas...@codeaurora.org>
---
 drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c 
b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
index f7d1744..ea0d986 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
@@ -133,12 +133,12 @@ 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)
@@ -150,6 +150,10 @@ 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
-- 
1.9.1