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authorQinglang Miao <miaoqinglang@huawei.com>2021-01-05 08:57:54 +0300
committerDavid S. Miller <davem@davemloft.net>2021-01-06 03:50:09 +0300
commit4beb17e553b49c3dd74505c9f361e756aaae653e (patch)
tree9914a730f6d332f64b770a3285d03303b54857e3 /net/qrtr
parent7a68d725e4ea384977445e0bcaed3d7de83ab5b3 (diff)
downloadlinux-4beb17e553b49c3dd74505c9f361e756aaae653e.tar.xz
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: Hulk Robot <hulkci@huawei.com> Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/qrtr')
-rw-r--r--net/qrtr/ns.c7
-rw-r--r--net/qrtr/qrtr.c16
-rw-r--r--net/qrtr/qrtr.h2
3 files changed, 16 insertions, 9 deletions
diff --git a/net/qrtr/ns.c b/net/qrtr/ns.c
index 56aaf8cb6527..8d00dfe8139e 100644
--- a/net/qrtr/ns.c
+++ b/net/qrtr/ns.c
@@ -755,7 +755,7 @@ static void qrtr_ns_data_ready(struct sock *sk)
queue_work(qrtr_ns.workqueue, &qrtr_ns.work);
}
-void qrtr_ns_init(void)
+int qrtr_ns_init(void)
{
struct sockaddr_qrtr sq;
int ret;
@@ -766,7 +766,7 @@ void qrtr_ns_init(void)
ret = sock_create_kern(&init_net, AF_QIPCRTR, SOCK_DGRAM,
PF_QIPCRTR, &qrtr_ns.sock);
if (ret < 0)
- return;
+ return ret;
ret = kernel_getsockname(qrtr_ns.sock, (struct sockaddr *)&sq);
if (ret < 0) {
@@ -797,12 +797,13 @@ void qrtr_ns_init(void)
if (ret < 0)
goto err_wq;
- return;
+ return 0;
err_wq:
destroy_workqueue(qrtr_ns.workqueue);
err_sock:
sock_release(qrtr_ns.sock);
+ return ret;
}
EXPORT_SYMBOL_GPL(qrtr_ns_init);
diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c
index f4ab3ca6d73b..b34358282f37 100644
--- a/net/qrtr/qrtr.c
+++ b/net/qrtr/qrtr.c
@@ -1287,13 +1287,19 @@ static int __init qrtr_proto_init(void)
return rc;
rc = sock_register(&qrtr_family);
- if (rc) {
- proto_unregister(&qrtr_proto);
- return rc;
- }
+ if (rc)
+ goto err_proto;
- 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;
}
postcore_initcall(qrtr_proto_init);
diff --git a/net/qrtr/qrtr.h b/net/qrtr/qrtr.h
index dc2b67f17927..3f2d28696062 100644
--- a/net/qrtr/qrtr.h
+++ b/net/qrtr/qrtr.h
@@ -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);
-void qrtr_ns_init(void);
+int qrtr_ns_init(void);
void qrtr_ns_remove(void);