n_gsm: add missing __user annotations

sparse warns about incorrect types:
n_gsm.c:2638:35: warning: incorrect type in argument 1 (different address spaces)
n_gsm.c:2638:35:    expected void [noderef] <asn:1> *to
n_gsm.c:2638:35:    got void *

The ioctl handler casts its `arg' to (void *) without __user. Add that.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20200219084949.28074-5-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 82e3d88..d866884 100644 (file)
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -2638,11 +2638,11 @@ static int gsmld_ioctl(struct tty_struct *tty, struct file *file,
        switch (cmd) {
        case GSMIOC_GETCONF:
                gsm_copy_config_values(gsm, &c);
-               if (copy_to_user((void *)arg, &c, sizeof(c)))
+               if (copy_to_user((void __user *)arg, &c, sizeof(c)))
                        return -EFAULT;
                return 0;
        case GSMIOC_SETCONF:
-               if (copy_from_user(&c, (void *)arg, sizeof(c)))
+               if (copy_from_user(&c, (void __user *)arg, sizeof(c)))
                        return -EFAULT;
                return gsm_config(gsm, &c);
        case GSMIOC_GETFIRST: