A null pointer dereference in qrtr_ns_data_ready() is seen if a client
opens a qrtr socket before qrtr_ns_init() can bind to the control port.
When the control port is bound, the ENETRESET error will be broadcasted
and clients will close their sockets. This results in DEL_CLIENT
packets being sent to the ns and qrtr_ns_data_ready() being called
without the workqueue being allocated.
Allocate the workqueue before setting sk_data_ready and binding to the
control port. This ensures that the work and workqueue structs are
allocated and initialized before qrtr_ns_data_ready can be called.
Fixes: 0c2204a4ad71 ("net: qrtr: Migrate nameservice to kernel from userspace")
Signed-off-by: Chris Lew <[email protected]>
---
net/qrtr/ns.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/net/qrtr/ns.c b/net/qrtr/ns.c
index e7d0fe3f4330..c5b3202a14ca 100644
--- a/net/qrtr/ns.c
+++ b/net/qrtr/ns.c
@@ -712,6 +712,10 @@ void qrtr_ns_init(void)
goto err_sock;
}
+ qrtr_ns.workqueue = alloc_workqueue("qrtr_ns_handler", WQ_UNBOUND, 1);
+ if (!qrtr_ns.workqueue)
+ goto err_sock;
+
qrtr_ns.sock->sk->sk_data_ready = qrtr_ns_data_ready;
sq.sq_port = QRTR_PORT_CTRL;
@@ -720,17 +724,13 @@ void qrtr_ns_init(void)
ret = kernel_bind(qrtr_ns.sock, (struct sockaddr *)&sq, sizeof(sq));
if (ret < 0) {
pr_err("failed to bind to socket\n");
- goto err_sock;
+ goto err_wq;
}
qrtr_ns.bcast_sq.sq_family = AF_QIPCRTR;
qrtr_ns.bcast_sq.sq_node = QRTR_NODE_BCAST;
qrtr_ns.bcast_sq.sq_port = QRTR_PORT_CTRL;
- qrtr_ns.workqueue = alloc_workqueue("qrtr_ns_handler", WQ_UNBOUND, 1);
- if (!qrtr_ns.workqueue)
- goto err_sock;
-
ret = say_hello(&qrtr_ns.bcast_sq);
if (ret < 0)
goto err_wq;
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
On Thu 28 May 16:05 PDT 2020, Chris Lew wrote:
> A null pointer dereference in qrtr_ns_data_ready() is seen if a client
> opens a qrtr socket before qrtr_ns_init() can bind to the control port.
> When the control port is bound, the ENETRESET error will be broadcasted
> and clients will close their sockets. This results in DEL_CLIENT
> packets being sent to the ns and qrtr_ns_data_ready() being called
> without the workqueue being allocated.
>
> Allocate the workqueue before setting sk_data_ready and binding to the
> control port. This ensures that the work and workqueue structs are
> allocated and initialized before qrtr_ns_data_ready can be called.
>
Reviewed-by: Bjorn Andersson <[email protected]>
Regards,
Bjorn
> Fixes: 0c2204a4ad71 ("net: qrtr: Migrate nameservice to kernel from userspace")
> Signed-off-by: Chris Lew <[email protected]>
> ---
> net/qrtr/ns.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/net/qrtr/ns.c b/net/qrtr/ns.c
> index e7d0fe3f4330..c5b3202a14ca 100644
> --- a/net/qrtr/ns.c
> +++ b/net/qrtr/ns.c
> @@ -712,6 +712,10 @@ void qrtr_ns_init(void)
> goto err_sock;
> }
>
> + qrtr_ns.workqueue = alloc_workqueue("qrtr_ns_handler", WQ_UNBOUND, 1);
> + if (!qrtr_ns.workqueue)
> + goto err_sock;
> +
> qrtr_ns.sock->sk->sk_data_ready = qrtr_ns_data_ready;
>
> sq.sq_port = QRTR_PORT_CTRL;
> @@ -720,17 +724,13 @@ void qrtr_ns_init(void)
> ret = kernel_bind(qrtr_ns.sock, (struct sockaddr *)&sq, sizeof(sq));
> if (ret < 0) {
> pr_err("failed to bind to socket\n");
> - goto err_sock;
> + goto err_wq;
> }
>
> qrtr_ns.bcast_sq.sq_family = AF_QIPCRTR;
> qrtr_ns.bcast_sq.sq_node = QRTR_NODE_BCAST;
> qrtr_ns.bcast_sq.sq_port = QRTR_PORT_CTRL;
>
> - qrtr_ns.workqueue = alloc_workqueue("qrtr_ns_handler", WQ_UNBOUND, 1);
> - if (!qrtr_ns.workqueue)
> - goto err_sock;
> -
> ret = say_hello(&qrtr_ns.bcast_sq);
> if (ret < 0)
> goto err_wq;
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
On Thu, May 28, 2020 at 04:05:26PM -0700, Chris Lew wrote:
> A null pointer dereference in qrtr_ns_data_ready() is seen if a client
> opens a qrtr socket before qrtr_ns_init() can bind to the control port.
> When the control port is bound, the ENETRESET error will be broadcasted
> and clients will close their sockets. This results in DEL_CLIENT
> packets being sent to the ns and qrtr_ns_data_ready() being called
> without the workqueue being allocated.
>
> Allocate the workqueue before setting sk_data_ready and binding to the
> control port. This ensures that the work and workqueue structs are
> allocated and initialized before qrtr_ns_data_ready can be called.
>
> Fixes: 0c2204a4ad71 ("net: qrtr: Migrate nameservice to kernel from userspace")
> Signed-off-by: Chris Lew <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>
Thanks,
Mani
> ---
> net/qrtr/ns.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/net/qrtr/ns.c b/net/qrtr/ns.c
> index e7d0fe3f4330..c5b3202a14ca 100644
> --- a/net/qrtr/ns.c
> +++ b/net/qrtr/ns.c
> @@ -712,6 +712,10 @@ void qrtr_ns_init(void)
> goto err_sock;
> }
>
> + qrtr_ns.workqueue = alloc_workqueue("qrtr_ns_handler", WQ_UNBOUND, 1);
> + if (!qrtr_ns.workqueue)
> + goto err_sock;
> +
> qrtr_ns.sock->sk->sk_data_ready = qrtr_ns_data_ready;
>
> sq.sq_port = QRTR_PORT_CTRL;
> @@ -720,17 +724,13 @@ void qrtr_ns_init(void)
> ret = kernel_bind(qrtr_ns.sock, (struct sockaddr *)&sq, sizeof(sq));
> if (ret < 0) {
> pr_err("failed to bind to socket\n");
> - goto err_sock;
> + goto err_wq;
> }
>
> qrtr_ns.bcast_sq.sq_family = AF_QIPCRTR;
> qrtr_ns.bcast_sq.sq_node = QRTR_NODE_BCAST;
> qrtr_ns.bcast_sq.sq_port = QRTR_PORT_CTRL;
>
> - qrtr_ns.workqueue = alloc_workqueue("qrtr_ns_handler", WQ_UNBOUND, 1);
> - if (!qrtr_ns.workqueue)
> - goto err_sock;
> -
> ret = say_hello(&qrtr_ns.bcast_sq);
> if (ret < 0)
> goto err_wq;
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
From: Chris Lew <[email protected]>
Date: Thu, 28 May 2020 16:05:26 -0700
> A null pointer dereference in qrtr_ns_data_ready() is seen if a client
> opens a qrtr socket before qrtr_ns_init() can bind to the control port.
> When the control port is bound, the ENETRESET error will be broadcasted
> and clients will close their sockets. This results in DEL_CLIENT
> packets being sent to the ns and qrtr_ns_data_ready() being called
> without the workqueue being allocated.
>
> Allocate the workqueue before setting sk_data_ready and binding to the
> control port. This ensures that the work and workqueue structs are
> allocated and initialized before qrtr_ns_data_ready can be called.
>
> Fixes: 0c2204a4ad71 ("net: qrtr: Migrate nameservice to kernel from userspace")
> Signed-off-by: Chris Lew <[email protected]>
Applied, thank you.