4.18-stable review patch. If anyone has any objections, please let me know.
------------------ From: Tomas Bortoli <tomasbort...@gmail.com> commit 10aa14527f458e9867cf3d2cc6b8cb0f6704448b upstream. Added checks to prevent GPFs from raising. Link: http://lkml.kernel.org/r/20180727110558.5479-1-tomasbort...@gmail.com Signed-off-by: Tomas Bortoli <tomasbort...@gmail.com> Reported-by: syzbot+1a262da37d3bead15...@syzkaller.appspotmail.com Cc: sta...@vger.kernel.org Signed-off-by: Dominique Martinet <dominique.marti...@cea.fr> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- net/9p/trans_fd.c | 5 ++++- net/9p/trans_rdma.c | 3 +++ net/9p/trans_virtio.c | 3 +++ net/9p/trans_xen.c | 3 +++ 4 files changed, 13 insertions(+), 1 deletion(-) --- a/net/9p/trans_fd.c +++ b/net/9p/trans_fd.c @@ -940,7 +940,7 @@ p9_fd_create_tcp(struct p9_client *clien if (err < 0) return err; - if (valid_ipaddr4(addr) < 0) + if (addr == NULL || valid_ipaddr4(addr) < 0) return -EINVAL; csocket = NULL; @@ -990,6 +990,9 @@ p9_fd_create_unix(struct p9_client *clie 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); --- a/net/9p/trans_rdma.c +++ b/net/9p/trans_rdma.c @@ -644,6 +644,9 @@ rdma_create_trans(struct p9_client *clie 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) --- a/net/9p/trans_virtio.c +++ b/net/9p/trans_virtio.c @@ -650,6 +650,9 @@ p9_virtio_create(struct p9_client *clien 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) && --- a/net/9p/trans_xen.c +++ b/net/9p/trans_xen.c @@ -94,6 +94,9 @@ static int p9_xen_create(struct p9_clien { 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)) {
