59 lines
1.7 KiB
Diff
59 lines
1.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Wei Xu <wexu@redhat.com>
|
|
Date: Fri, 1 Dec 2017 05:10:38 -0500
|
|
Subject: [PATCH] tap: free skb if flags error
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
tap_recvmsg() supports accepting skb by msg_control after
|
|
commit 3b4ba04acca8 ("tap: support receiving skb from msg_control"),
|
|
the skb if presented should be freed within the function, otherwise
|
|
it would be leaked.
|
|
|
|
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/tap.c | 14 ++++++++++----
|
|
1 file changed, 10 insertions(+), 4 deletions(-)
|
|
|
|
diff --git a/drivers/net/tap.c b/drivers/net/tap.c
|
|
index 3570c7576993..4e04b6094f3c 100644
|
|
--- a/drivers/net/tap.c
|
|
+++ b/drivers/net/tap.c
|
|
@@ -829,8 +829,11 @@ static ssize_t tap_do_read(struct tap_queue *q,
|
|
DEFINE_WAIT(wait);
|
|
ssize_t ret = 0;
|
|
|
|
- if (!iov_iter_count(to))
|
|
+ if (!iov_iter_count(to)) {
|
|
+ if (skb)
|
|
+ kfree_skb(skb);
|
|
return 0;
|
|
+ }
|
|
|
|
if (skb)
|
|
goto put;
|
|
@@ -1155,11 +1158,14 @@ static int tap_recvmsg(struct socket *sock, struct msghdr *m,
|
|
size_t total_len, int flags)
|
|
{
|
|
struct tap_queue *q = container_of(sock, struct tap_queue, sock);
|
|
+ struct sk_buff *skb = m->msg_control;
|
|
int ret;
|
|
- if (flags & ~(MSG_DONTWAIT|MSG_TRUNC))
|
|
+ if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) {
|
|
+ if (skb)
|
|
+ kfree_skb(skb);
|
|
return -EINVAL;
|
|
- ret = tap_do_read(q, &m->msg_iter, flags & MSG_DONTWAIT,
|
|
- m->msg_control);
|
|
+ }
|
|
+ ret = tap_do_read(q, &m->msg_iter, flags & MSG_DONTWAIT, skb);
|
|
if (ret > total_len) {
|
|
m->msg_flags |= MSG_TRUNC;
|
|
ret = flags & MSG_TRUNC ? ret : total_len;
|
|
--
|
|
2.14.2
|
|
|