3.16.62-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Tomas Bortoli <tomasbortoli@xxxxxxxxx> commit 10aa14527f458e9867cf3d2cc6b8cb0f6704448b upstream. Added checks to prevent GPFs from raising. Link: http://lkml.kernel.org/r/20180727110558.5479-1-tomasbortoli@xxxxxxxxx Signed-off-by: Tomas Bortoli <tomasbortoli@xxxxxxxxx> Reported-by: syzbot+1a262da37d3bead15c39@xxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Dominique Martinet <dominique.martinet@xxxxxx> [bwh: Backported to 3.16: - Drop changes in trans_xen.c Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx> --- --- a/net/9p/trans_fd.c +++ b/net/9p/trans_fd.c @@ -934,7 +934,7 @@ 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; @@ -982,6 +982,9 @@ 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 @@ -623,6 +623,9 @@ rdma_create_trans(struct p9_client *clie struct ib_qp_init_attr qp_attr; struct ib_device_attr devattr; + 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 @@ -622,6 +622,9 @@ 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) &&
