4.9-stable review patch. If anyone has any objections, please let me know.
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From: Andrey Ignatov rdna@fb.com
[ Upstream commit 1b97013bfb11d66f041de691de6f0fec748ce016 ]
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/ipv4/ping.c | 7 +++++-- net/ipv4/udp.c | 7 +++++-- 2 files changed, 10 insertions(+), 4 deletions(-)
--- a/net/ipv4/ping.c +++ b/net/ipv4/ping.c @@ -775,8 +775,10 @@ static int ping_v4_sendmsg(struct sock * 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); @@ -841,6 +843,7 @@ back_from_confirm:
out: ip_rt_put(rt); +out_free: if (free) kfree(ipc.opt); if (!err) { --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -982,8 +982,10 @@ int udp_sendmsg(struct sock *sk, struct 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; } @@ -1090,6 +1092,7 @@ do_append_data:
out: ip_rt_put(rt); +out_free: if (free) kfree(ipc.opt); if (!err)