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authorDavid S. Miller <davem@davemloft.net>2009-10-29 21:28:59 -0700
committerDavid S. Miller <davem@davemloft.net>2009-10-29 21:28:59 -0700
commit0519d83d83ed485b5a1f9222ff69d7d6c9bb8a01 (patch)
tree2e336be8a4bd2e59bcd4b69b00feb77c6672a9cb /net/ipv4/raw.c
parent38bfd8f5bec496e8e0db8849e01c99a33479418a (diff)
parentb5dd884e682cae6b8c037f9d11f3b623b4cf2011 (diff)
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Diffstat (limited to 'net/ipv4/raw.c')
-rw-r--r--net/ipv4/raw.c24
1 files changed, 17 insertions, 7 deletions
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 9ef8c0829a7..ce154b47f1d 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -351,13 +351,24 @@ 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;
@@ -380,8 +391,7 @@ 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);