From: Loic Poulain loic.poulain@linaro.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@syzkaller.appspotmail.com Signed-off-by: Loic Poulain loic.poulain@linaro.org Reviewed-by: Bjorn Andersson bjorn.andersson@linaro.org Reviewed-by: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.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 45fbf5f4dcd2..93a7edcff11e 100644 --- a/net/qrtr/qrtr.c +++ b/net/qrtr/qrtr.c @@ -266,7 +266,10 @@ 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);