[PATCH] net: qrtr: free flow in __qrtr_node_release

[Carl Huang <cjhuang@codeaurora.org>]

The flow is allocated in qrtr_tx_wait, but not freed when qrtr node
is released. (*slot) becomes NULL after radix_tree_iter_delete is
called in __qrtr_node_release. The fix is to save (*slot) to a
vairable and then free it.

This memory leak is catched when kmemleak is enabled in kernel,
the report looks like below:

unreferenced object 0xffffa0de69e08420 (size 32):
  comm "kworker/u16:3", pid 176, jiffies 4294918275 (age 82858.876s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 28 84 e0 69 de a0 ff ff  ........(..i....
    28 84 e0 69 de a0 ff ff 03 00 00 00 00 00 00 00  (..i............
  backtrace:
    [<00000000e252af0a>] qrtr_node_enqueue+0x38e/0x400 [qrtr]
    [<000000009cea437f>] qrtr_sendmsg+0x1e0/0x2a0 [qrtr]
    [<000000008bddbba4>] sock_sendmsg+0x5b/0x60
    [<0000000003beb43a>] qmi_send_message.isra.3+0xbe/0x110 [qmi_helpers]
    [<000000009c9ae7de>] qmi_send_request+0x1c/0x20 [qmi_helpers]

Signed-off-by: Carl Huang <cjhuang@codeaurora.org>
---
 net/qrtr/qrtr.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c
index 2d8d613..1855857 100644
--- a/net/qrtr/qrtr.c
+++ b/net/qrtr/qrtr.c
@@ -168,6 +168,7 @@ static void __qrtr_node_release(struct kref *kref)
 	struct radix_tree_iter iter;
 	unsigned long flags;
 	void __rcu **slot;
+	struct qrtr_tx_flow *flow;
 
 	spin_lock_irqsave(&qrtr_nodes_lock, flags);
 	if (node->nid != QRTR_EP_NID_AUTO)
@@ -181,8 +182,9 @@ static void __qrtr_node_release(struct kref *kref)
 
 	/* Free tx flow counters */
 	radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) {
+		flow = *slot;
 		radix_tree_iter_delete(&node->qrtr_tx_flow, &iter, slot);
-		kfree(*slot);
+		kfree(flow);
 	}
 	kfree(node);
 }
-- 
2.7.4