net: qrtr: free flow in __qrtr_node_release

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>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c
index 2d8d6131bc5f7e23b168af2dcd377d55c278cd8e..05988133078840bed2f73248ff74ee71f8ac5878 100644 (file)
--- a/net/qrtr/qrtr.c
+++ b/net/qrtr/qrtr.c
@@ -166,6 +166,7 @@ static void __qrtr_node_release(struct kref *kref)
 {
        struct qrtr_node *node = container_of(kref, struct qrtr_node, ref);
        struct radix_tree_iter iter;
+       struct qrtr_tx_flow *flow;
        unsigned long flags;
        void __rcu **slot;
 
@@ -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);
 }