| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 40/67] net: qrtr: fix memory leaks | Date | Mon, 2 Aug 2021 15:45:03 +0200 |
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From: Pavel Skripkin <paskripkin@gmail.com>
[ Upstream commit 52f3456a96c06760b9bfae460e39596fec7af22e ]
Syzbot reported memory leak in qrtr. The problem was in unputted struct sock. qrtr_local_enqueue() function calls qrtr_port_lookup() which takes sock reference if port was found. Then there is the following check:
if (!ipc || &ipc->sk == skb->sk) { ... return -ENODEV; }
Since we should drop the reference before returning from this function and ipc can be non-NULL inside this if, we should add qrtr_port_put() inside this if.
The similar corner case is in qrtr_endpoint_post() as Manivannan reported. In case of sock_queue_rcv_skb() failure we need to put port reference to avoid leaking struct sock pointer.
Fixes: e04df98adf7d ("net: qrtr: Remove receive worker") Fixes: bdabad3e363d ("net: Add Qualcomm IPC router") Reported-and-tested-by: syzbot+35a511c72ea7356cdcf3@syzkaller.appspotmail.com Signed-off-by: Pavel Skripkin <paskripkin@gmail.com> Reviewed-by: Manivannan Sadhasivam <mani@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org> --- net/qrtr/qrtr.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c index 0d9baddb9cd4..6826558483f9 100644 --- a/net/qrtr/qrtr.c +++ b/net/qrtr/qrtr.c @@ -504,8 +504,10 @@ int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len) if (!ipc) goto err; - if (sock_queue_rcv_skb(&ipc->sk, skb)) + if (sock_queue_rcv_skb(&ipc->sk, skb)) { + qrtr_port_put(ipc); goto err; + } qrtr_port_put(ipc); } @@ -830,6 +832,8 @@ static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb, ipc = qrtr_port_lookup(to->sq_port); if (!ipc || &ipc->sk == skb->sk) { /* do not send to self */ + if (ipc) + qrtr_port_put(ipc); kfree_skb(skb); return -ENODEV; } -- 2.30.2
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