commit 6cf0a9254f0b7fc41781a2cacd5a8b312a4b1e70
Author: Octavian Purdila <opurdila@ixiacom.com>
Date:   Wed Jul 2 21:25:51 2008 +0300

    tcp: fix a size_t < 0 comparison in tcp_read_sock
    
    <used> should be of type int (not size_t) since recv_actor can return
    negative values and it is also used in a < 0 comparison.
    
    Signed-off-by: Octavian Purdila <opurdila@ixiacom.com>

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 850825d..4f91d17 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1208,7 +1208,8 @@ int tcp_read_sock(struct sock *sk, read_descriptor_t *desc,
 		return -ENOTCONN;
 	while ((skb = tcp_recv_skb(sk, seq, &offset)) != NULL) {
 		if (offset < skb->len) {
-			size_t used, len;
+			int used;
+			size_t len;
 
 			len = skb->len - offset;
 			/* Stop reading if we hit a patch of urgent data */