From 42404c09151029689659818e2196ee2fd97142aa Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Tue, 10 Dec 2013 22:05:45 -0500 Subject: [PATCH] Revert "tun: remove useless codes in tun_chr_aio_read() and tun_recvmsg()" This reverts commit 73713357ab58aacda1af715bb5a623528dbbfd79. MSG_TRUNC handling was broken and is going to be fixed in the 'net' tree, so revert this. Signed-off-by: David S. Miller --- drivers/net/tun.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/tun.c b/drivers/net/tun.c index bbb6935..3c5a8d8 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -1354,6 +1354,7 @@ static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, ret = tun_do_read(tun, tfile, iv, len, file->f_flags & O_NONBLOCK); + ret = min_t(ssize_t, ret, len); if (ret > 0) iocb->ki_pos = ret; out: @@ -1454,6 +1455,10 @@ static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, } ret = tun_do_read(tun, tfile, m->msg_iov, total_len, flags & MSG_DONTWAIT); + if (ret > total_len) { + m->msg_flags |= MSG_TRUNC; + ret = flags & MSG_TRUNC ? ret : total_len; + } out: tun_put(tun); return ret; -- 2.7.4