diff options
| author | Eric Dumazet <edumazet@google.com> | 2016-02-04 06:23:28 -0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2016-05-01 00:05:25 +0200 |
| commit | 86f1994adf420f3b47409301eb225e77eafc5b12 (patch) | |
| tree | c9b54925343e47bf4842bf2dfe63319184fe50cd | |
| parent | 619d48665f45c3a9ccadd8cf171cb8ce230900ec (diff) | |
ipv4: fix memory leaks in ip_cmsg_send() callers
[ Upstream commit 919483096bfe75dda338e98d56da91a263746a0a ]
Dmitry reported memory leaks of IP options allocated in
ip_cmsg_send() when/if this function returns an error.
Callers are responsible for the freeing.
Many thanks to Dmitry for the report and diagnostic.
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | net/ipv4/ip_sockglue.c | 2 | ||||
| -rw-r--r-- | net/ipv4/ping.c | 4 | ||||
| -rw-r--r-- | net/ipv4/raw.c | 4 | ||||
| -rw-r--r-- | net/ipv4/udp.c | 4 |
4 files changed, 11 insertions, 3 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index 043d8822a138..b3648bbef0da 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -206,6 +206,8 @@ int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc) switch (cmsg->cmsg_type) { case IP_RETOPTS: err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); + + /* Our caller is responsible for freeing ipc->opt */ err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40); if (err) diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c index 7aa6225e7fe3..5d28677345e0 100644 --- a/net/ipv4/ping.c +++ b/net/ipv4/ping.c @@ -530,8 +530,10 @@ static int ping_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, if (msg->msg_controllen) { err = ip_cmsg_send(sock_net(sk), msg, &ipc); - if (err) + if (unlikely(err)) { + kfree(ipc.opt); return err; + } if (ipc.opt) free = 1; } diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c index 063bcd54d268..e6430963e994 100644 --- a/net/ipv4/raw.c +++ b/net/ipv4/raw.c @@ -520,8 +520,10 @@ static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, if (msg->msg_controllen) { err = ip_cmsg_send(sock_net(sk), msg, &ipc); - if (err) + if (unlikely(err)) { + kfree(ipc.opt); goto out; + } if (ipc.opt) free = 1; } diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index f602611ae9c9..f64a1e548beb 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -875,8 +875,10 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, return err; if (msg->msg_controllen) { err = ip_cmsg_send(sock_net(sk), msg, &ipc); - if (err) + if (unlikely(err)) { + kfree(ipc.opt); return err; + } if (ipc.opt) free = 1; connected = 0; |