From a7807d73a0fa9b33dbdfd5f1cb97970ccc91d77e Mon Sep 17 00:00:00 2001 From: Jukka Rissanen Date: Wed, 1 Oct 2014 11:30:57 +0300 Subject: [PATCH] Bluetooth: 6lowpan: Avoid memory leak if memory allocation fails If skb_unshare() returns NULL, then we leak the original skb. Solution is to use temp variable to hold the new skb. Signed-off-by: Jukka Rissanen Signed-off-by: Johan Hedberg --- net/bluetooth/6lowpan.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c index add2b58312d7..44eaad77e70c 100644 --- a/net/bluetooth/6lowpan.c +++ b/net/bluetooth/6lowpan.c @@ -589,13 +589,17 @@ static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev) int err = 0; bdaddr_t addr; u8 addr_type; + struct sk_buff *tmpskb; /* We must take a copy of the skb before we modify/replace the ipv6 * header as the header could be used elsewhere */ - skb = skb_unshare(skb, GFP_ATOMIC); - if (!skb) + tmpskb = skb_unshare(skb, GFP_ATOMIC); + if (!tmpskb) { + kfree_skb(skb); return NET_XMIT_DROP; + } + skb = tmpskb; /* Return values from setup_header() * <0 - error, packet is dropped -- 2.20.1