Revert "ipv4: fix memory leaks in ip_cmsg_send() callers"

This reverts commit 919483096bfe75dda338e98d56da91a263746a0a.

There is only when ip_options_get() return zero need to free.
It already called kfree() when return error.

Fixes: 919483096bfe ("ipv4: fix memory leaks in ip_cmsg_send() callers")
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index b297bb2..7cef998 100644 (file)
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -279,7 +279,7 @@ int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc,
                case IP_RETOPTS:
                        err = cmsg->cmsg_len - sizeof(struct cmsghdr);
 
-                       /* Our caller is responsible for freeing ipc->opt */
+                       /* Our caller is responsible for freeing ipc->opt when err = 0 */
                        err = ip_options_get(net, &ipc->opt,
                                             KERNEL_SOCKPTR(CMSG_DATA(cmsg)),
                                             err < 40 ? err : 40);

diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index 1e44a43..c588f9f 100644 (file)
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -727,10 +727,9 @@ static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 
        if (msg->msg_controllen) {
                err = ip_cmsg_send(sk, msg, &ipc, false);
-               if (unlikely(err)) {
-                       kfree(ipc.opt);
+               if (unlikely(err))
                        return err;
-               }
+
                if (ipc.opt)
                        free = 1;
        }

diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index bb446e6..1c98063 100644 (file)
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -562,10 +562,9 @@ static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 
        if (msg->msg_controllen) {
                err = ip_cmsg_send(sk, msg, &ipc, false);
-               if (unlikely(err)) {
-                       kfree(ipc.opt);
+               if (unlikely(err))
                        goto out;
-               }
+
                if (ipc.opt)
                        free = 1;
        }

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 8851c94..d5f5981 100644 (file)
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1122,10 +1122,9 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
                if (err > 0)
                        err = ip_cmsg_send(sk, msg, &ipc,
                                           sk->sk_family == AF_INET6);
-               if (unlikely(err < 0)) {
-                       kfree(ipc.opt);
+               if (unlikely(err < 0))
                        return err;
-               }
+
                if (ipc.opt)
                        free = 1;
                connected = 0;