netdev - [PATCH] net: qrtr: Fix memory leak on qrtr_tx

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Date:   Tue, 30 Mar 2021 16:11:08 +0200
From:   Loic Poulain <loic.poulain@...aro.org>
To:     manivannan.sadhasivam@...aro.org
Cc:     netdev@...r.kernel.org, bjorn.andersson@...aro.org,
        kuba@...nel.org, davem@...emloft.net,
        Loic Poulain <loic.poulain@...aro.org>
Subject: [PATCH] net: qrtr: Fix memory leak on qrtr_tx_wait failure

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>
---
 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 f4ab3ca6..a01b50c7 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);
-- 
2.7.4