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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 919483096b.

* udp_sendmsg one was there since the beginning when linux sources were
  first added to git;
* ping_v4_sendmsg one was copy/pasted in c319b4d76b.

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: c319b4d76b (net: ipv4: add IPPROTO_ICMP socket kind)
Signed-off-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrey Ignatov 2018-05-10 10:59:34 -07:00 committed by David S. Miller
parent 8ccc113172
commit 1b97013bfb
2 changed files with 10 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
net/ipv4/ping.c
View File

@ -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) {

7
net/ipv4/udp.c
View File

@ -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)