From: Dan Carpenter <dan.carpenter@oracle.com>
To: Karsten Keil <isdn@linux-pingi.de>
Cc: "David S. Miller" <davem@davemloft.net>,
Konstantin Khlebnikov <khlebnikov@openvz.org>,
netdev@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [patch] mISDN: return -EINVAL on error in dsp_control_req()
Date: Thu, 29 Aug 2013 08:47:00 +0000 [thread overview]
Message-ID: <20130829084700.GF14334@elgon.mountain> (raw)
If skb->len is too short then we should return an error. Otherwise we
read beyond the end of skb->data for several bytes.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/drivers/isdn/mISDN/dsp_core.c b/drivers/isdn/mISDN/dsp_core.c
index 22b720e..77025f5 100644
--- a/drivers/isdn/mISDN/dsp_core.c
+++ b/drivers/isdn/mISDN/dsp_core.c
@@ -288,8 +288,10 @@ dsp_control_req(struct dsp *dsp, struct mISDNhead *hh, struct sk_buff *skb)
u8 *data;
int len;
- if (skb->len < sizeof(int))
+ if (skb->len < sizeof(int)) {
printk(KERN_ERR "%s: PH_CONTROL message too short\n", __func__);
+ return -EINVAL;
+ }
cont = *((int *)skb->data);
len = skb->len - sizeof(int);
data = skb->data + sizeof(int);
next reply other threads:[~2013-08-29 8:47 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-29 8:47 Dan Carpenter [this message]
2013-08-30 21:53 ` [patch] mISDN: return -EINVAL on error in dsp_control_req() David Miller
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