1 files changed, 17 insertions, 7 deletions

diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 757c9171e7c2..ab996f9c0fe0 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -352,13 +352,24 @@ static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
         skb->ip_summed = CHECKSUM_NONE;
 
         skb->transport_header = skb->network_header;
-        err = memcpy_fromiovecend((void *)iph, from, 0, length);
-        if (err)
-                goto error_fault;
+        err = -EFAULT;
+        if (memcpy_fromiovecend((void *)iph, from, 0, length))
+                goto error_free;
 
-        /* We don't modify invalid header */
         iphlen = iph->ihl * 4;
-        if (iphlen >= sizeof(*iph) && iphlen <= length) {
+
+        /*
+         * We don't want to modify the ip header, but we do need to
+         * be sure that it won't cause problems later along the network
+         * stack.  Specifically we want to make sure that iph->ihl is a
+         * sane value.  If ihl points beyond the length of the buffer passed
+         * in, reject the frame as invalid
+         */
+        err = -EINVAL;
+        if (iphlen > length)
+                goto error_free;
+
+        if (iphlen >= sizeof(*iph)) {
                 if (!iph->saddr)
                         iph->saddr = rt->rt_src;
                 iph->check   = 0;
@@ -381,8 +392,7 @@ static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
 out:
         return 0;
 
-error_fault:
-        err = -EFAULT;
+error_free:
         kfree_skb(skb);
 error:
         IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);