pve-kernel-thunderx/patches/kernel/0009-tun-free-skb-in-early-errors.patch

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From ccc0b8662620d562798183b77bcd30125d2d14f3 Mon Sep 17 00:00:00 2001
From: Wei Xu <wexu@redhat.com>
Date: Fri, 1 Dec 2017 05:10:37 -0500
Subject: [PATCH 09/13] tun: free skb in early errors
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
tun_recvmsg() supports accepting skb by msg_control after
commit ac77cfd4258f ("tun: support receiving skb through msg_control"),
the skb if presented should be freed no matter how far it can go
along, otherwise it would be leaked.
This patch fixes several missed cases.
Signed-off-by: Wei Xu <wexu@redhat.com>
Reported-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
---
drivers/net/tun.c | 24 ++++++++++++++++++------
1 file changed, 18 insertions(+), 6 deletions(-)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index cb1f7747adad..5143e948d7d1 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1519,8 +1519,11 @@ static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile,
tun_debug(KERN_INFO, tun, "tun_do_read\n");
- if (!iov_iter_count(to))
+ if (!iov_iter_count(to)) {
+ if (skb)
+ kfree_skb(skb);
return 0;
+ }
if (!skb) {
/* Read frames from ring */
@@ -1636,22 +1639,24 @@ static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len,
{
struct tun_file *tfile = container_of(sock, struct tun_file, socket);
struct tun_struct *tun = __tun_get(tfile);
+ struct sk_buff *skb = m->msg_control;
int ret;
- if (!tun)
- return -EBADFD;
+ if (!tun) {
+ ret = -EBADFD;
+ goto out_free_skb;
+ }
if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) {
ret = -EINVAL;
- goto out;
+ goto out_put_tun;
}
if (flags & MSG_ERRQUEUE) {
ret = sock_recv_errqueue(sock->sk, m, total_len,
SOL_PACKET, TUN_TX_TIMESTAMP);
goto out;
}
- ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT,
- m->msg_control);
+ ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT, skb);
if (ret > (ssize_t)total_len) {
m->msg_flags |= MSG_TRUNC;
ret = flags & MSG_TRUNC ? ret : total_len;
@@ -1659,6 +1664,13 @@ static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len,
out:
tun_put(tun);
return ret;
+
+out_put_tun:
+ tun_put(tun);
+out_free_skb:
+ if (skb)
+ kfree_skb(skb);
+ return ret;
}
static int tun_peek_len(struct socket *sock)
--
2.14.2