From: Taehee Yoo ap420073@gmail.com
[ Upstream commit d16207f92a4a823c48b4ea953ad51f4483456768 ]
When amt interface receives amt message, it tries to obtain amt private data from sock. If there is no amt private data, it frees an skb immediately. After kfree_skb(), it increases the rx_dropped stats. But in order to use rx_dropped, amt private data is needed. So, it makes amt_rcv() to do not increase rx_dropped stats when it can not obtain amt private data.
Reported-by: kernel test robot lkp@intel.com Reported-by: Dan Carpenter dan.carpenter@oracle.com Fixes: 1a1a0e80e005 ("amt: fix possible memory leak in amt_rcv()") Signed-off-by: Taehee Yoo ap420073@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/amt.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/amt.c b/drivers/net/amt.c index d8c47c4e6559..e239c0262d56 100644 --- a/drivers/net/amt.c +++ b/drivers/net/amt.c @@ -2698,7 +2698,8 @@ static int amt_rcv(struct sock *sk, struct sk_buff *skb) amt = rcu_dereference_sk_user_data(sk); if (!amt) { err = true; - goto drop; + kfree_skb(skb); + goto out; }
skb->dev = amt->dev;