diff options
| author | Pavel Skripkin <paskripkin@gmail.com> | 2021-07-23 18:31:32 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-08-04 13:46:42 +0300 |
| commit | 6961323eed46d6aee7b87ec758580d334579438c (patch) | |
| tree | fdd312e85d032dbc716b18d954b85e9b87cbfcf3 /net/qrtr | |
| parent | 91350564ea8c0d72b9d60d1bace5adb090c97193 (diff) | |
| download | linux-6961323eed46d6aee7b87ec758580d334579438c.tar.xz | |
net: qrtr: fix memory leaks
[ 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>
Diffstat (limited to 'net/qrtr')
| -rw-r--r-- | net/qrtr/qrtr.c | 6 |
1 files changed, 5 insertions, 1 deletions
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; } |