netdev - [PATCH] net: qrtr: fix memory leak in qrtr_local

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Message-Id: <20210722161625.6956-1-paskripkin@gmail.com>
Date:   Thu, 22 Jul 2021 19:16:25 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     mani@...nel.org, davem@...emloft.net, kuba@...nel.org,
        bjorn.andersson@...ymobile.com, courtney.cavin@...ymobile.com
Cc:     linux-arm-msm@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Pavel Skripkin <paskripkin@...il.com>,
        syzbot+35a511c72ea7356cdcf3@...kaller.appspotmail.com
Subject: [PATCH] net: qrtr: fix memory leak in qrtr_local_enqueue

Syzbot reported memory leak in qrtr. The problem was in unputted
struct sock. qrtr_local_enqueue() function calls qrtr_port_lookup()
which takes sock reference if port was found. Then there is the following
check:

if (!ipc || &ipc->sk == skb->sk) {
	...
	return -ENODEV;
}

Since we should drop the reference before returning from this function and
ipc can be non-NULL inside this if, we should add qrtr_port_put() inside
this if.

Fixes: bdabad3e363d ("net: Add Qualcomm IPC router")
Reported-and-tested-by: syzbot+35a511c72ea7356cdcf3@...kaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
---
 net/qrtr/qrtr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c
index e6f4a6202f82..d5ce428d0b25 100644
--- a/net/qrtr/qrtr.c
+++ b/net/qrtr/qrtr.c
@@ -839,6 +839,8 @@ static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb,
 
 	ipc = qrtr_port_lookup(to->sq_port);
 	if (!ipc || &ipc->sk == skb->sk) { /* do not send to self */
+		if (ipc)
+			qrtr_port_put(ipc);
 		kfree_skb(skb);
 		return -ENODEV;
 	}
-- 
2.32.0