Messages in this thread Patch in this message | | | From | Jiri Slaby <> | Subject | [PATCH 3.12 017/116] ipv4: fix memory leaks in ip_cmsg_send() callers | Date | Fri, 4 Mar 2016 10:01:02 +0100 |
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From: Eric Dumazet <edumazet@google.com>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
[ 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> Signed-off-by: Jiri Slaby <jslaby@suse.cz> --- net/ipv4/ip_sockglue.c | 2 ++ net/ipv4/ping.c | 4 +++- net/ipv4/raw.c | 4 +++- 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 f6603142cb33..9e4f832aaf13 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -200,6 +200,8 @@ 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 54012b8c0ef9..716dff49d0b9 100644 --- a/net/ipv4/ping.c +++ b/net/ipv4/ping.c @@ -740,8 +740,10 @@ int ping_v4_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 6183d36c038b..ed96b2320e5f 100644 --- a/net/ipv4/raw.c +++ b/net/ipv4/raw.c @@ -523,8 +523,10 @@ 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 f8e304667108..f904b644a40c 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -910,8 +910,10 @@ int udp_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; connected = 0; -- 2.7.2
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