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authorHerbert Xu <herbert@gondor.apana.org.au>2008-01-06 02:14:44 -0500
committerDavid S. Miller <davem@davemloft.net>2008-01-09 02:29:57 -0500
commitf844c74fe07321953e2dd227fe35280075f18f60 (patch)
tree045fedb426c7990ad254520cb413010acbbe0ab8 /net
parentcb77df3ec88f07c6141924dfe6fd96a2f541cc09 (diff)
[IPV4] raw: Strengthen check on validity of iph->ihl
We currently check that iph->ihl is bounded by the real length and that the real length is greater than the minimum IP header length. However, we did not check the caes where iph->ihl is less than the minimum IP header length. This breaks because some ip_fast_csum implementations assume that which is quite reasonable. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/raw.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 66b42f547bf9..e7050f8eabeb 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -271,6 +271,7 @@ static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
271 int hh_len; 271 int hh_len;
272 struct iphdr *iph; 272 struct iphdr *iph;
273 struct sk_buff *skb; 273 struct sk_buff *skb;
274 unsigned int iphlen;
274 int err; 275 int err;
275 276
276 if (length > rt->u.dst.dev->mtu) { 277 if (length > rt->u.dst.dev->mtu) {
@@ -304,7 +305,8 @@ static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
304 goto error_fault; 305 goto error_fault;
305 306
306 /* We don't modify invalid header */ 307 /* We don't modify invalid header */
307 if (length >= sizeof(*iph) && iph->ihl * 4U <= length) { 308 iphlen = iph->ihl * 4;
309 if (iphlen >= sizeof(*iph) && iphlen <= length) {
308 if (!iph->saddr) 310 if (!iph->saddr)
309 iph->saddr = rt->rt_src; 311 iph->saddr = rt->rt_src;
310 iph->check = 0; 312 iph->check = 0;