linux-kernel - [PATCH 4.2.y-ckt 192/206] IB/IWPM: Fix a potential skb leak

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Date:	Thu,  9 Jun 2016 14:16:41 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Mark Bloch <markb@...lanox.com>, Leon Romanovsky <leon@...nel.org>,
	Doug Ledford <dledford@...hat.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 192/206] IB/IWPM: Fix a potential skb leak

4.2.8-ckt12 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Mark Bloch <markb@...lanox.com>

commit 5ed935e861a4cbf2158ad3386d6d26edd60d2658 upstream.

In case ibnl_put_msg fails in send_nlmsg_done,
the function returns with -ENOMEM without freeing.

This patch fixes this behavior.

Fixes: 30dc5e63d6a5 ("RDMA/core: Add support for iWARP Port Mapper user space service")
Signed-off-by: Mark Bloch <markb@...lanox.com>
Reviewed-by: Leon Romanovsky <leonro@...lanox.com>
Signed-off-by: Leon Romanovsky <leon@...nel.org>
Reviewed-by: Steve Wise <swise@...ngridcomputing.com>
Signed-off-by: Doug Ledford <dledford@...hat.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/infiniband/core/iwpm_util.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/infiniband/core/iwpm_util.c b/drivers/infiniband/core/iwpm_util.c
index 5fb089e..fb43a24 100644
--- a/drivers/infiniband/core/iwpm_util.c
+++ b/drivers/infiniband/core/iwpm_util.c
@@ -634,6 +634,7 @@ static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
 	if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
 			   RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
 		pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
+		dev_kfree_skb(skb);
 		return -ENOMEM;
 	}
 	nlh->nlmsg_type = NLMSG_DONE;
-- 
2.7.4