[SRU][Vivid][PATCH 1/1] tun: return proper error code from tun_do_read
Joseph Salisbury
joseph.salisbury at canonical.com
Tue Apr 28 20:38:40 UTC 2015
From: Alex Gartrell <agartrell at fb.com>
BugLink: http://bugs.launchpad.net/bugs/1448942
Instead of -1 with EAGAIN, read on a O_NONBLOCK tun fd will return 0. This
fixes this by properly returning the error code from __skb_recv_datagram.
Signed-off-by: Alex Gartrell <agartrell at fb.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit 957f094f221f81e457133b1f4c4d95ffa49ff731)
Signed-off-by: Joseph Salisbury <joseph.salisbury at canonical.com>
---
drivers/net/tun.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 10f9e40..9a409a8f 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1368,7 +1368,7 @@ static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile,
skb = __skb_recv_datagram(tfile->socket.sk, noblock ? MSG_DONTWAIT : 0,
&peeked, &off, &err);
if (!skb)
- return 0;
+ return err;
ret = tun_put_user(tun, tfile, skb, to);
if (unlikely(ret < 0))
--
2.1.0
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