netdev - [PATCH net-next] net: fix signedness bug in skb_splice_from

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Message-ID: <99284df8-9190-4deb-ad7c-c0557614a1c8@kili.mountain>
Date: Fri, 26 May 2023 14:46:02 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: David Howells <dhowells@...hat.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Alexander Duyck <alexanderduyck@...com>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Pavel Begunkov <asml.silence@...il.com>,
	Kees Cook <keescook@...omium.org>, Jiri Benc <jbenc@...hat.com>,
	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH net-next] net: fix signedness bug in skb_splice_from_iter()

The "len" variable needs to be signed for the error handling to work
correctly.

Fixes: 2e910b95329c ("net: Add a function to splice pages into an skbuff for MSG_SPLICE_PAGES")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 net/core/skbuff.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 653abd8a6975..57a8ba81ab39 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -6932,7 +6932,8 @@ ssize_t skb_splice_from_iter(struct sk_buff *skb, struct iov_iter *iter,
 
 	while (iter->count > 0) {
 		ssize_t space, nr;
-		size_t off, len;
+		ssize_t len;
+		size_t off;
 
 		ret = -EMSGSIZE;
 		space = frag_limit - skb_shinfo(skb)->nr_frags;
-- 
2.39.2