Commit 4beb17e5 authored by Qinglang Miao's avatar Qinglang Miao Committed by David S. Miller

net: qrtr: fix null-ptr-deref in qrtr_ns_remove

A null-ptr-deref bug is reported by Hulk Robot like this:
--------------
KASAN: null-ptr-deref in range [0x0000000000000128-0x000000000000012f]
Call Trace:
qrtr_ns_remove+0x22/0x40 [ns]
qrtr_proto_fini+0xa/0x31 [qrtr]
__x64_sys_delete_module+0x337/0x4e0
do_syscall_64+0x34/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x468ded
--------------

When qrtr_ns_init fails in qrtr_proto_init, qrtr_ns_remove which would
be called later on would raise a null-ptr-deref because qrtr_ns.workqueue
has been destroyed.

Fix it by making qrtr_ns_init have a return value and adding a check in
qrtr_proto_init.
Reported-by: default avatarHulk Robot <hulkci@huawei.com>
Signed-off-by: default avatarQinglang Miao <miaoqinglang@huawei.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7a68d725
...@@ -755,7 +755,7 @@ static void qrtr_ns_data_ready(struct sock *sk) ...@@ -755,7 +755,7 @@ static void qrtr_ns_data_ready(struct sock *sk)
queue_work(qrtr_ns.workqueue, &qrtr_ns.work); queue_work(qrtr_ns.workqueue, &qrtr_ns.work);
} }
void qrtr_ns_init(void) int qrtr_ns_init(void)
{ {
struct sockaddr_qrtr sq; struct sockaddr_qrtr sq;
int ret; int ret;
...@@ -766,7 +766,7 @@ void qrtr_ns_init(void) ...@@ -766,7 +766,7 @@ void qrtr_ns_init(void)
ret = sock_create_kern(&init_net, AF_QIPCRTR, SOCK_DGRAM, ret = sock_create_kern(&init_net, AF_QIPCRTR, SOCK_DGRAM,
PF_QIPCRTR, &qrtr_ns.sock); PF_QIPCRTR, &qrtr_ns.sock);
if (ret < 0) if (ret < 0)
return; return ret;
ret = kernel_getsockname(qrtr_ns.sock, (struct sockaddr *)&sq); ret = kernel_getsockname(qrtr_ns.sock, (struct sockaddr *)&sq);
if (ret < 0) { if (ret < 0) {
...@@ -797,12 +797,13 @@ void qrtr_ns_init(void) ...@@ -797,12 +797,13 @@ void qrtr_ns_init(void)
if (ret < 0) if (ret < 0)
goto err_wq; goto err_wq;
return; return 0;
err_wq: err_wq:
destroy_workqueue(qrtr_ns.workqueue); destroy_workqueue(qrtr_ns.workqueue);
err_sock: err_sock:
sock_release(qrtr_ns.sock); sock_release(qrtr_ns.sock);
return ret;
} }
EXPORT_SYMBOL_GPL(qrtr_ns_init); EXPORT_SYMBOL_GPL(qrtr_ns_init);
......
...@@ -1287,13 +1287,19 @@ static int __init qrtr_proto_init(void) ...@@ -1287,13 +1287,19 @@ static int __init qrtr_proto_init(void)
return rc; return rc;
rc = sock_register(&qrtr_family); rc = sock_register(&qrtr_family);
if (rc) { if (rc)
proto_unregister(&qrtr_proto); goto err_proto;
return rc;
}
qrtr_ns_init(); rc = qrtr_ns_init();
if (rc)
goto err_sock;
return 0;
err_sock:
sock_unregister(qrtr_family.family);
err_proto:
proto_unregister(&qrtr_proto);
return rc; return rc;
} }
postcore_initcall(qrtr_proto_init); postcore_initcall(qrtr_proto_init);
......
...@@ -29,7 +29,7 @@ void qrtr_endpoint_unregister(struct qrtr_endpoint *ep); ...@@ -29,7 +29,7 @@ void qrtr_endpoint_unregister(struct qrtr_endpoint *ep);
int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len); int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len);
void qrtr_ns_init(void); int qrtr_ns_init(void);
void qrtr_ns_remove(void); void qrtr_ns_remove(void);
......
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