caif: Ldisc add permission check and mem-alloc error check
Changes:
o Added permission checks for installing. CAP_SYS_ADMIN and
CAP_SYS_TTY_CONFIG can install the ldisc.
o Check if allocation of skb was successful.
Signed-off-by: Sjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/caif/caif_serial.c b/drivers/net/caif/caif_serial.c
index 38c0186..09257ca 100644
--- a/drivers/net/caif/caif_serial.c
+++ b/drivers/net/caif/caif_serial.c
@@ -197,7 +197,8 @@
/* Get a suitable caif packet and copy in data. */
skb = netdev_alloc_skb(ser->dev, count+1);
- BUG_ON(skb == NULL);
+ if (skb == NULL)
+ return;
p = skb_put(skb, count);
memcpy(p, data, count);
@@ -315,6 +316,8 @@
/* No write no play */
if (tty->ops->write == NULL)
return -EOPNOTSUPP;
+ if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_TTY_CONFIG))
+ return -EPERM;
sprintf(name, "cf%s", tty->name);
dev = alloc_netdev(sizeof(*ser), name, caifdev_setup);