[PATCH] net: qrtr: Fix memory leak on qrtr_tx_wait failure

[Loic Poulain]

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+739016799a89c530b...@syzkaller.appspotmail.com
Signed-off-by: Loic Poulain <loic.poul...@linaro.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