netdev - [PATCH net-next] tcp: tcp_sendmsg() wrong access to sk_route

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Date:	Mon, 28 Nov 2011 11:27:47 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	Michał Mirosław <mirq-linux@...e.qmqm.pl>
Subject: [PATCH net-next] tcp: tcp_sendmsg() wrong access to sk_route_caps

Now sk_route_caps is u64, its dangerous to use an integer to store
result of an AND operator. It wont work if NETIF_F_SG is moved on the
upper part of u64.

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
CC: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 net/ipv4/tcp.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 50c3596..ecbc89a 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -891,7 +891,7 @@ EXPORT_SYMBOL(tcp_sendpage);
 #define TCP_PAGE(sk)	(sk->sk_sndmsg_page)
 #define TCP_OFF(sk)	(sk->sk_sndmsg_off)
 
-static inline int select_size(const struct sock *sk, int sg)
+static inline int select_size(const struct sock *sk, bool sg)
 {
 	const struct tcp_sock *tp = tcp_sk(sk);
 	int tmp = tp->mss_cache;
@@ -917,9 +917,9 @@ int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 	struct iovec *iov;
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct sk_buff *skb;
-	int iovlen, flags;
+	int iovlen, flags, err, copied;
 	int mss_now, size_goal;
-	int sg, err, copied;
+	bool sg;
 	long timeo;
 
 	lock_sock(sk);
@@ -946,7 +946,7 @@ int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 	if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
 		goto out_err;
 
-	sg = sk->sk_route_caps & NETIF_F_SG;
+	sg = !!(sk->sk_route_caps & NETIF_F_SG);
 
 	while (--iovlen >= 0) {
 		size_t seglen = iov->iov_len;


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