On 2017年12月01日 13:54, wexu@xxxxxxxxxx wrote:
From: Wei Xu <wexu@xxxxxxxxxx>
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@xxxxxxxxxx>
Reported-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxxxxxxx>
---
drivers/net/tap.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/net/tap.c b/drivers/net/tap.c
index e9489b8..1c66b75 100644
--- a/drivers/net/tap.c
+++ b/drivers/net/tap.c
@@ -1154,9 +1154,13 @@ 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);
Need to deal with iov_iterator_count() == 0.
Thanks
if (ret > total_len) {
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