Received-SPF: pass (google.com: domain of linux-kernel+bounces-115729-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1;
From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
	Benjamin Coddington <bcodding@redhat.com>,
	Trond Myklebust <trond.myklebust@hammerspace.com>,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH 6.6 530/638] net: sunrpc: Fix an off by one in rpc_sockaddr2uaddr()
Date: Sun, 24 Mar 2024 18:59:27 -0400
Message-ID: <20240324230116.1348576-531-sashal@kernel.org>
In-Reply-To: <20240324230116.1348576-1-sashal@kernel.org>
References: <20240324230116.1348576-1-sashal@kernel.org>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

[ Upstream commit d6f4de70f73a106986ee315d7d512539f2f3303a ]

The intent is to check if the strings' are truncated or not. So, >= should
be used instead of >, because strlcat() and snprintf() return the length of
the output, excluding the trailing NULL.

Fixes: a02d69261134 ("SUNRPC: Provide functions for managing universal addresses")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/sunrpc/addr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/sunrpc/addr.c b/net/sunrpc/addr.c
index d435bffc61999..97ff11973c493 100644
--- a/net/sunrpc/addr.c
+++ b/net/sunrpc/addr.c
@@ -284,10 +284,10 @@ char *rpc_sockaddr2uaddr(const struct sockaddr *sap, gfp_t gfp_flags)
 	}
 
 	if (snprintf(portbuf, sizeof(portbuf),
-		     ".%u.%u", port >> 8, port & 0xff) > (int)sizeof(portbuf))
+		     ".%u.%u", port >> 8, port & 0xff) >= (int)sizeof(portbuf))
 		return NULL;
 
-	if (strlcat(addrbuf, portbuf, sizeof(addrbuf)) > sizeof(addrbuf))
+	if (strlcat(addrbuf, portbuf, sizeof(addrbuf)) >= sizeof(addrbuf))
 		return NULL;
 
 	return kstrdup(addrbuf, gfp_flags);
-- 
2.43.0