[PATCH] tcp_vu: Fix off-by one in header count array adjustment

[Stefano Brivio <sbrivio@redhat.com>]

From: Laurent Vivier <lvivier@redhat.com>

Not entirely clear to me why, but Laurent proposed this patch to fix
an issue were we would end up with a zero buf_cnt in
tcp_vu_data_from_sock() and all sorts of weirdnesses.

Reported-by: David Gibson <david@gibson.dropbear.id.au>
[sbrivio: commit message, albeit not really descriptive]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
---
 tcp_vu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tcp_vu.c b/tcp_vu.c
index fad7065..0622f17 100644
--- a/tcp_vu.c
+++ b/tcp_vu.c
@@ -261,7 +261,7 @@ static ssize_t tcp_vu_sock_recv(const struct ctx *c,
 		len -= iov->iov_len;
 	}
 	/* adjust head count */
-	while (head_cnt > 0 && head[head_cnt - 1] > i)
+	while (head_cnt > 0 && head[head_cnt - 1] >= i)
 		head_cnt--;
 	/* mark end of array */
 	head[head_cnt] = i;
-- 
@@ -261,7 +261,7 @@ static ssize_t tcp_vu_sock_recv(const struct ctx *c,
 		len -= iov->iov_len;
 	}
 	/* adjust head count */
-	while (head_cnt > 0 && head[head_cnt - 1] > i)
+	while (head_cnt > 0 && head[head_cnt - 1] >= i)
 		head_cnt--;
 	/* mark end of array */
 	head[head_cnt] = i;
-- 
2.43.0