9p: fix multiple NULL-pointer-dereferences

commit 10aa14527f458e9867cf3d2cc6b8cb0f6704448b upstream.

Added checks to prevent GPFs from raising.

Link: http://lkml.kernel.org/r/20180727110558.5479-1-tomasbortoli@gmail.com
Signed-off-by: Tomas Bortoli <tomasbortoli@gmail.com>
Reported-by: syzbot+1a262da37d3bead15c39@syzkaller.appspotmail.com
Cc: stable@vger.kernel.org
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index 985046ae42312e86505d6fded2fb56501c38536b..0102bfd57fe4e337c4bf792276aa443ba10f9add 100644 (file)
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -951,7 +951,7 @@ p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
        if (err < 0)
                return err;
 
-       if (valid_ipaddr4(addr) < 0)
+       if (addr == NULL || valid_ipaddr4(addr) < 0)
                return -EINVAL;
 
        csocket = NULL;
@@ -1001,6 +1001,9 @@ p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
 
        csocket = NULL;
 
+       if (addr == NULL)
+               return -EINVAL;
+
        if (strlen(addr) >= UNIX_PATH_MAX) {
                pr_err("%s (%d): address too long: %s\n",
                       __func__, task_pid_nr(current), addr);

diff --git a/net/9p/trans_rdma.c b/net/9p/trans_rdma.c
index 6d8e3031978f3493edb123a51b58b30b1c2807c5..f58467a490903b166b263a054ec009c6499d640c 100644 (file)
--- a/net/9p/trans_rdma.c
+++ b/net/9p/trans_rdma.c
@@ -646,6 +646,9 @@ rdma_create_trans(struct p9_client *client, const char *addr, char *args)
        struct rdma_conn_param conn_param;
        struct ib_qp_init_attr qp_attr;
 
+       if (addr == NULL)
+               return -EINVAL;
+
        /* Parse the transport specific mount options */
        err = parse_opts(args, &opts);
        if (err < 0)

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 202c8ef1c0fad289643b03bf1f6c079f1f9cc06e..a03336ede2ca7fa7b52d4b87fa342e39638f9caf 100644 (file)
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -650,6 +650,9 @@ p9_virtio_create(struct p9_client *client, const char *devname, char *args)
        int ret = -ENOENT;
        int found = 0;
 
+       if (devname == NULL)
+               return -EINVAL;
+
        mutex_lock(&virtio_9p_lock);
        list_for_each_entry(chan, &virtio_chan_list, chan_list) {
                if (!strncmp(devname, chan->tag, chan->tag_len) &&

diff --git a/net/9p/trans_xen.c b/net/9p/trans_xen.c
index 325c56043007d89886203626a2a139f1ab8fc52a..c10bdf63eae7a8192c7a00869e731f09358a3cb5 100644 (file)
--- a/net/9p/trans_xen.c
+++ b/net/9p/trans_xen.c
@@ -95,6 +95,9 @@ static int p9_xen_create(struct p9_client *client, const char *addr, char *args)
 {
        struct xen_9pfs_front_priv *priv;
 
+       if (addr == NULL)
+               return -EINVAL;
+
        read_lock(&xen_9pfs_lock);
        list_for_each_entry(priv, &xen_9pfs_devs, list) {
                if (!strcmp(priv->tag, addr)) {