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-rw-r--r--net/ipv4/ip_options.c49
-rw-r--r--net/ipv4/ip_sockglue.c4
2 files changed, 36 insertions, 17 deletions
diff --git a/net/ipv4/ip_options.c b/net/ipv4/ip_options.c
index 7e02ba5..bce4e87 100644
--- a/net/ipv4/ip_options.c
+++ b/net/ipv4/ip_options.c
@@ -489,23 +489,18 @@ void ip_options_undo(struct ip_options * opt)
}
}
-int ip_options_get(struct ip_options **optp, unsigned char *data, int optlen, int user)
+static struct ip_options *ip_options_get_alloc(const int optlen)
{
- struct ip_options *opt;
+ struct ip_options *opt = kmalloc(sizeof(*opt) + ((optlen + 3) & ~3),
+ GFP_KERNEL);
+ if (opt)
+ memset(opt, 0, sizeof(*opt));
+ return opt;
+}
- opt = kmalloc(sizeof(struct ip_options)+((optlen+3)&~3), GFP_KERNEL);
- if (!opt)
- return -ENOMEM;
- memset(opt, 0, sizeof(struct ip_options));
- if (optlen) {
- if (user) {
- if (copy_from_user(opt->__data, data, optlen)) {
- kfree(opt);
- return -EFAULT;
- }
- } else
- memcpy(opt->__data, data, optlen);
- }
+static int ip_options_get_finish(struct ip_options **optp,
+ struct ip_options *opt, int optlen)
+{
while (optlen & 3)
opt->__data[optlen++] = IPOPT_END;
opt->optlen = optlen;
@@ -521,6 +516,30 @@ int ip_options_get(struct ip_options **optp, unsigned char *data, int optlen, in
return 0;
}
+int ip_options_get_from_user(struct ip_options **optp, unsigned char __user *data, int optlen)
+{
+ struct ip_options *opt = ip_options_get_alloc(optlen);
+
+ if (!opt)
+ return -ENOMEM;
+ if (optlen && copy_from_user(opt->__data, data, optlen)) {
+ kfree(opt);
+ return -EFAULT;
+ }
+ return ip_options_get_finish(optp, opt, optlen);
+}
+
+int ip_options_get(struct ip_options **optp, unsigned char *data, int optlen)
+{
+ struct ip_options *opt = ip_options_get_alloc(optlen);
+
+ if (!opt)
+ return -ENOMEM;
+ if (optlen)
+ memcpy(opt->__data, data, optlen);
+ return ip_options_get_finish(optp, opt, optlen);
+}
+
void ip_forward_options(struct sk_buff *skb)
{
struct ip_options * opt = &(IPCB(skb)->opt);
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index aca088b..2f0b47d 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -153,7 +153,7 @@ int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
switch (cmsg->cmsg_type) {
case IP_RETOPTS:
err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
- err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40, 0);
+ err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
if (err)
return err;
break;
@@ -425,7 +425,7 @@ int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
struct ip_options * opt = NULL;
if (optlen > 40 || optlen < 0)
goto e_inval;
- err = ip_options_get(&opt, optval, optlen, 1);
+ err = ip_options_get_from_user(&opt, optval, optlen);
if (err)
break;
if (sk->sk_type == SOCK_STREAM) {
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