ipv4: fix memory leaks in udp_sendmsg, ping_v4_sendmsg

Fix more memory leaks in ip_cmsg_send() callers. Part of them were fixed
earlier in 919483096bfe.

* udp_sendmsg one was there since the beginning when linux sources were
  first added to git;
* ping_v4_sendmsg one was copy/pasted in c319b4d76b9e.

Whenever return happens in udp_sendmsg() or ping_v4_sendmsg() IP options
have to be freed if they were allocated previously.

Add label so that future callers (if any) can use it instead of kfree()
before return that is easy to forget.

Fixes: c319b4d76b9e (net: ipv4: add IPPROTO_ICMP socket kind)
Signed-off-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 10 insertions, 4 deletions

diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index 05e47d777009..56a010622f70 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -775,8 +775,10 @@ static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
         ipc.addr = faddr = daddr;
 
         if (ipc.opt && ipc.opt->opt.srr) {
-                if (!daddr)
-                        return -EINVAL;
+                if (!daddr) {
+                        err = -EINVAL;
+                        goto out_free;
+                }
                 faddr = ipc.opt->opt.faddr;
         }
         tos = get_rttos(&ipc, inet);
@@ -842,6 +844,7 @@ back_from_confirm:
 
 out:
         ip_rt_put(rt);
+out_free:
         if (free)
                 kfree(ipc.opt);
         if (!err) {
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index c2a292dfd137..b61a770884fa 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -952,8 +952,10 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
         sock_tx_timestamp(sk, ipc.sockc.tsflags, &ipc.tx_flags);
 
         if (ipc.opt && ipc.opt->opt.srr) {
-                if (!daddr)
-                        return -EINVAL;
+                if (!daddr) {
+                        err = -EINVAL;
+                        goto out_free;
+                }
                 faddr = ipc.opt->opt.faddr;
                 connected = 0;
         }
@@ -1074,6 +1076,7 @@ do_append_data:
 
 out:
         ip_rt_put(rt);
+out_free:
         if (free)
                 kfree(ipc.opt);
         if (!err)