From: Sjur Braendeland <sjur.brandeland@stericsson.com>
Date: Wed, 28 Apr 2010 08:54:34 +0000 (+0000)
Subject: caif: Ldisc add permission check and mem-alloc error check
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d3f744e0d6c1c27a10cdceac6eb946122188dbc9;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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 38c0186cfbc2..09257ca8f563 100644
--- a/drivers/net/caif/caif_serial.c
+++ b/drivers/net/caif/caif_serial.c
@@ -197,7 +197,8 @@ static void ldisc_receive(struct tty_struct *tty, const u8 *data,
 
 	/* 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 @@ static int ldisc_open(struct tty_struct *tty)
 	/* 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);