linux-kernel - [PATCH 5.11 138/210] net: qrtr: Fix memory leak on qrtr_tx

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Message-Id: <20210412084020.596002938@linuxfoundation.org>
Date:   Mon, 12 Apr 2021 10:40:43 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+739016799a89c530b32a@...kaller.appspotmail.com,
        Loic Poulain <loic.poulain@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 138/210] net: qrtr: Fix memory leak on qrtr_tx_wait failure

From: Loic Poulain <loic.poulain@...aro.org>

[ Upstream commit 8a03dd925786bdc3834d56ccc980bb70668efa35 ]

qrtr_tx_wait does not check for radix_tree_insert failure, causing
the 'flow' object to be unreferenced after qrtr_tx_wait return. Fix
that by releasing flow on radix_tree_insert failure.

Fixes: 5fdeb0d372ab ("net: qrtr: Implement outgoing flow control")
Reported-by: syzbot+739016799a89c530b32a@...kaller.appspotmail.com
Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/qrtr/qrtr.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c
index dfc820ee553a..1e4fb568fa84 100644
--- a/net/qrtr/qrtr.c
+++ b/net/qrtr/qrtr.c
@@ -271,7 +271,10 @@ static int qrtr_tx_wait(struct qrtr_node *node, int dest_node, int dest_port,
 		flow = kzalloc(sizeof(*flow), GFP_KERNEL);
 		if (flow) {
 			init_waitqueue_head(&flow->resume_tx);
-			radix_tree_insert(&node->qrtr_tx_flow, key, flow);
+			if (radix_tree_insert(&node->qrtr_tx_flow, key, flow)) {
+				kfree(flow);
+				flow = NULL;
+			}
 		}
 	}
 	mutex_unlock(&node->qrtr_tx_lock);
-- 
2.30.2